refactor: add app directory, dir structure change

3 files changed, 0 insertions, 1791 deletions

diff --git a/ui/__init__.py b/ui/__init__.py
deleted file mode 100644
index 4986a10..0000000
--- a/ui/__init__.py
+++ /dev/null
@@ -1,9 +0,0 @@
-"""The TUI frontend for the audiobook generator.
-
-``ui.tui`` is the DOS-style curses widget library, and ``ui.hub`` is the
-main menu the user sees when running ``audiobook.py`` with no arguments
-(set up/configure backends, convert the input directory). It is the only
-entry point for the interactive workflow; everything else under
-``backends/`` and ``converter/`` is library code driven by it or by the
-``audiobook.py`` CLI flags.
-"""
diff --git a/ui/hub.py b/ui/hub.py
deleted file mode 100644
index b2a2b08..0000000
--- a/ui/hub.py
+++ /dev/null
@@ -1,637 +0,0 @@
-#!/usr/bin/env python3
-"""The TUI main menu for the audiobook generator (run via ``audiobook.py``).
-
-The hub is the single entry point for the whole workflow: it detects which
-backends are already set up and offers to convert the input directory with
-one of them, set up a new backend, or configure an existing one.
-Each backend's setup wizard runs in its own curses session, so the hub
-collects a "command" inside its own wrapper, returns to the plain terminal,
-and then dispatches — no nested curses sessions.
-
-Esc on the main menu quits the hub. Esc inside a sub-menu falls back to the
-main menu.
-"""
-
-import json
-import re
-from pathlib import Path
-from typing import Optional, Tuple
-
-import audiobook
-from backends import (
-    REGISTRY,
-    BackendStatus,
-    ServerSpec,
-    common,
-    detect_all,
-    get,
-    servers,
-)
-from backends import audiocpp as audiocpp_backend
-from backends import faster as faster_backend
-from converter import config
-from converter.converter import AUDIO_FORMATS
-from converter.tts import (
-    AUDIOCPP_FAMILY_QWEN3_TTS,
-    BACKEND_AUDIOCPP,
-    BACKEND_FASTER,
-    BACKEND_QWEN,
-    normalize_language,
-)
-from ui import tui
-
-_GO_BACK = object()
-
-
-def run() -> int:
-    """Run the hub menu loop until the user quits. Returns exit code."""
-    import curses
-    while True:
-        try:
-            command = curses.wrapper(_hub_menu)
-        except tui.WizardCancelled:
-            return 0
-        except KeyboardInterrupt:
-            return 130
-        if command is None:
-            return 0
-        kind = command[0]
-        if kind == "quit":
-            return 0
-        if kind == "setup":
-            info = get(command[1])
-            if info is not None:
-                info.setup_tui()
-        elif kind == "configure":
-            info = get(command[1])
-            if info is not None and command[2] < len(info.configure_actions):
-                info.configure_actions[command[2]].run()
-        elif kind == "convert":
-            _run_conversion(command[1], command[2])
-        elif kind == "server":
-            _run_server_action(command[1], command[2])
-
-
-def _hub_menu(stdscr) -> Optional[tuple]:
-    """Show the main menu; return a command tuple, or None to quit."""
-    while True:
-        statuses = detect_all()
-        options = [("Set up a backend...", "setup")]
-        if any(st.installed or st.running for st in statuses):
-            options.insert(0, ("Convert books...", "convert"))
-            options.append(("Configure a backend...", "configure"))
-            options.append(("Server...", "server"))
-        options.append(("Settings...", "settings"))
-        options.append(("Quit", "quit"))
-        rows = [(st.label, *_status_mark(st)) for st in statuses]
-        choice = tui.menu(
-            stdscr, "tts-audiobook-generator", options,
-            table_title="Backend status", table_rows=rows)
-        if choice is None or choice == "quit":
-            return None
-        if choice == "convert":
-            cmd = _convert_menu(stdscr, statuses)
-            if cmd is not None:
-                return cmd
-        elif choice == "setup":
-            cmd = _setup_menu(stdscr, statuses)
-            if cmd is not None:
-                return cmd
-        elif choice == "configure":
-            cmd = _configure_menu(stdscr, statuses)
-            if cmd is not None:
-                return cmd
-        elif choice == "server":
-            cmd = _server_menu(stdscr, statuses)
-            if cmd is not None:
-                return cmd
-        elif choice == "settings":
-            _settings_menu(stdscr)
-
-
-def _setup_menu(stdscr, statuses) -> Optional[tuple]:
-    """Pick a backend to set up. Returns ("setup", key) or None to go back."""
-    by_key = {st.key: st for st in statuses}
-    options = [(f"{info.label}  ({_status_mark(by_key.get(info.key))[0]})",
-                info.key) for info in REGISTRY]
-    choice = tui.menu(stdscr, "Set up a backend", options,
-                      back_value=_GO_BACK,
-                      help_lines=["Clone/build/install a backend so you can "
-                                  "convert with it."])
-    if choice is _GO_BACK or choice is None:
-        return None
-    return ("setup", choice)
-
-
-def _configure_menu(stdscr, statuses) -> Optional[tuple]:
-    """Pick an installed backend and one of its configure actions."""
-    by_key = {st.key: st for st in statuses}
-    installed = [info for info in REGISTRY
-                 if by_key.get(info.key) is not None
-                 and by_key[info.key].installed]
-    if not installed:
-        tui.flash(stdscr, "No backend is installed yet — use 'Set up a "
-                  "backend' first.")
-        return None
-    options = [(info.label, info.key) for info in installed]
-    key = tui.menu(stdscr, "Configure a backend", options, back_value=_GO_BACK)
-    if key is _GO_BACK or key is None:
-        return None
-    info = get(key)
-    actions = info.configure_actions
-    choice = tui.menu(
-        stdscr, f"Configure {info.label}",
-        [(action.label, index) for index, action in enumerate(actions)],
-        back_value=_GO_BACK)
-    if choice is _GO_BACK or choice is None:
-        return None
-    return ("configure", key, choice)
-
-
-def _status_mark(status: Optional[BackendStatus]) -> Tuple[str, str, str]:
-    """Map a backend's state to (status_text, status_kind, name_kind).
-
-    'running' (green/ok) takes priority — an external server is already up;
-    otherwise 'installed' (orange/warn) when the backend is present on disk,
-    or 'unavailable' (red/err). A backend that is neither installed nor
-    running is unusable, so its name is dimmed (NAME_KIND).
-    CURSES has no true orange, so the theme's yellow 'warn' is used; it
-    renders amber/orange on most terminals.
-    """
-    if status is not None and status.running:
-        return ("running", "ok", "body")
-    if status is not None and status.installed:
-        return ("installed", "warn", "body")
-    return ("unavailable", "err", "dim")
-
-
-def _convert_menu(stdscr, statuses) -> Optional[tuple]:
-    """Pick an available backend and collect per-backend run settings."""
-    available = [st for st in statuses if st.ready or st.running]
-    options = [(st.label, st.key) for st in available]
-    if not available:
-        choice = tui.menu(
-            stdscr, "No backend is available",
-            [("Set up a backend...", "__setup__")],
-            help_lines=["Set up a backend (clone/build/configure) before "
-                        "converting."])
-        if choice == "__setup__":
-            return _setup_menu(stdscr, statuses)
-        return None
-    options.append(("Set up a backend...", "__setup__"))
-    key = tui.menu(stdscr, "Convert books with...", options,
-                   back_value=_GO_BACK)
-    if key is _GO_BACK or key is None:
-        return None
-    if key == "__setup__":
-        return _setup_menu(stdscr, statuses)
-    if key == BACKEND_AUDIOCPP:
-        cmd = _convert_audiocpp(stdscr, statuses)
-    elif key == BACKEND_QWEN:
-        cmd = _convert_qwen(stdscr)
-    elif key == BACKEND_FASTER:
-        cmd = _convert_faster(stdscr)
-    else:
-        return None
-    if cmd is None:
-        return None
-    _add_autostart(stdscr, cmd, statuses)
-    return cmd
-
-
-def _convert_audiocpp(stdscr, statuses) -> Optional[tuple]:
-    """Collect audio.cpp run settings by reading ./audio.cpp/server.json."""
-    checkout = audiocpp_backend.find_local_checkout()
-    server_json = checkout / "server.json" if checkout else None
-    if not server_json or not server_json.exists():
-        tui.flash(stdscr, "No server.json found in the audio.cpp checkout. "
-                  "Run 'Set up a backend' first.")
-        return None
-    try:
-        data = json.loads(server_json.read_text(encoding="utf-8"))
-    except (OSError, ValueError):
-        tui.flash(stdscr, f"Could not read {server_json}.")
-        return None
-    models = data.get("models") or []
-    if not models:
-        tui.flash(stdscr, "No model entries in server.json. Reconfigure "
-                  "audio.cpp first.")
-        return None
-    model_options = [(f"{m.get('id')}  ({m.get('family')}, {m.get('task', 'tts')})",
-                      m.get("id")) for m in models]
-    model_id = tui.menu(stdscr, "Select the audio.cpp model to use",
-                        model_options, back_value=_GO_BACK)
-    if model_id is _GO_BACK or model_id is None:
-        return None
-    entry = next((m for m in models if m.get("id") == model_id), {})
-    family = entry.get("family")
-    task = entry.get("task", "tts")
-
-    # Voice: optional for qwen3_tts (built-in speaker), required otherwise.
-    voice = None
-    voice_dir = data.get("voice_dir")
-    voices = _list_voices(voice_dir) if voice_dir else []
-    if task == "vdes":
-        # Voice design: no voice, instructions required.
-        pass
-    elif family == AUDIOCPP_FAMILY_QWEN3_TTS:
-        # Speaker mode available; voice optional.
-        if voices:
-            opts = [("(built-in speaker)", None)] + [(v, v) for v in voices]
-            voice = tui.menu(stdscr, "Voice", opts, back_value=_GO_BACK)
-            if voice is _GO_BACK:
-                return None
-        else:
-            voice = None
-    else:
-        if not voices:
-            tui.flash(stdscr, f"This model needs a --voice but voice_dir "
-                      f"{voice_dir} has no .wav voices. Reconfigure "
-                      "audio.cpp or add voices.")
-            return None
-        voice = tui.menu(stdscr, "Select the voice to clone", [(v, v) for v in voices],
-                         back_value=_GO_BACK)
-        if voice is _GO_BACK or voice is None:
-            return None
-
-    # Instructions: required for vdes, optional otherwise.
-    instructions = None
-    if task == "vdes":
-        instructions = tui.line_edit(
-            stdscr, "Voice design instructions (required for this model)",
-            config.AUDIOCPP_INSTRUCTIONS,
-            validate=lambda s: None if s.strip()
-            else "Describe the voice, e.g. 'A warm female narrator'",
-            back_value=_GO_BACK)
-        if instructions is _GO_BACK:
-            return None
-    else:
-        instructions = tui.line_edit(
-            stdscr, "Style instructions (optional, blank for none)",
-            config.AUDIOCPP_INSTRUCTIONS, back_value=_GO_BACK)
-        if instructions is _GO_BACK:
-            return None
-        if not instructions.strip():
-            instructions = None
-
-    common_kw = _common_options(stdscr)
-    if common_kw is None:
-        return None
-    return ("convert", BACKEND_AUDIOCPP, {
-        "model_id": model_id, "voice": voice, "instructions": instructions,
-        **common_kw,
-    })
-
-
-def _convert_qwen(stdscr) -> Optional[tuple]:
-    """Collect qwen run settings: built-in speaker or clone a .wav."""
-    mode = tui.menu(
-        stdscr, "qwen-tts mode",
-        [("Custom voice (built-in speaker)", "custom"),
-         ("Voice clone from a .wav file", "clone")],
-        back_value=_GO_BACK,
-        help_lines=[f"Speaker: {config.SPEAKER} (change it via Configure "
-                    "qwen-tts)"])
-    if mode is _GO_BACK or mode is None:
-        return None
-    clone = None
-    if mode == "clone":
-        clone = tui.line_edit(
-            stdscr, "Path to a reference .wav (10-15s is ideal)",
-            "",
-            validate=lambda s: None if (s and Path(s).is_file()
-                                        and s.lower().endswith(".wav"))
-            else "Enter the path to an existing .wav file",
-            back_value=_GO_BACK)
-        if clone is _GO_BACK:
-            return None
-    common_kw = _common_options(stdscr)
-    if common_kw is None:
-        return None
-    return ("convert", BACKEND_QWEN, {"clone": clone, **common_kw})
-
-
-def _convert_faster(stdscr) -> Optional[tuple]:
-    """Collect faster run settings: pick a voice from voices.json."""
-    checkout = faster_backend._checkout()
-    voices_json = checkout / "voices.json"
-    if not voices_json.exists():
-        tui.flash(stdscr, f"No voices.json at {voices_json}. Run 'Set up a "
-                  "backend' for faster first.")
-        return None
-    try:
-        voices = json.loads(voices_json.read_text(encoding="utf-8"))
-    except (OSError, ValueError):
-        tui.flash(stdscr, f"Could not read {voices_json}.")
-        return None
-    if not voices:
-        tui.flash(stdscr, "voices.json has no voices. Reconfigure faster.")
-        return None
-    default = config.FASTER_VOICE if config.FASTER_VOICE in voices else \
-        next(iter(voices))
-    voice = tui.menu(
-        stdscr, "Select the voice to clone",
-        [(k, k) for k in voices],
-        default_index=list(voices).index(default), back_value=_GO_BACK)
-    if voice is _GO_BACK or voice is None:
-        return None
-    common_kw = _common_options(stdscr)
-    if common_kw is None:
-        return None
-    return ("convert", BACKEND_FASTER, {"voice": voice, **common_kw})
-
-
-def _common_options(stdscr) -> Optional[dict]:
-    """Collect output format, speed, single-file, chunk, debug."""
-    fmt_options = [(f, f) for f in AUDIO_FORMATS]
-    fmt_default = AUDIO_FORMATS.index(config.AUDIO_FORMAT) \
-        if config.AUDIO_FORMAT in AUDIO_FORMATS else 0
-    output_format = tui.menu(stdscr, "Output format", fmt_options,
-                             default_index=fmt_default, back_value=_GO_BACK)
-    if output_format is _GO_BACK or output_format is None:
-        return None
-    speed_text = tui.line_edit(
-        stdscr, "Playback speed (1.0 = normal)", "1.0",
-        validate=lambda s: None if (_is_float(s) and float(s) > 0)
-        else "Enter a positive number, e.g. 1.0",
-        back_value=_GO_BACK)
-    if speed_text is _GO_BACK:
-        return None
-    single_file = tui.confirm(stdscr, "Combine all chapters into one file?",
-                              default=False, cancel_value=_GO_BACK)
-    if single_file is _GO_BACK:
-        return None
-    chunk = tui.confirm(stdscr, "Force client-side chunking (--chunk)?",
-                        default=False, cancel_value=_GO_BACK)
-    if chunk is _GO_BACK:
-        return None
-    debug = tui.confirm(stdscr, "Debug mode (dump per-chunk audio/text)?",
-                        default=False, cancel_value=_GO_BACK)
-    if debug is _GO_BACK:
-        return None
-    return {
-        "output_format": output_format,
-        "speed": float(speed_text),
-        "single_file": single_file,
-        "chunk": chunk,
-        "debug": debug,
-    }
-
-
-# ---------------------------------------------------------------------------
-# Settings menu (global output options -> converter/config.py)
-# ---------------------------------------------------------------------------
-
-def _settings_menu(stdscr) -> None:
-    """Edit the global output settings; Save writes them back to config.py."""
-    fields = [
-        {"key": "audio_format", "label": "Audio format", "kind": "choice",
-         "value": config.AUDIO_FORMAT, "choices": list(AUDIO_FORMATS)},
-        {"key": "audio_bitrate", "label": "Audio bitrate", "kind": "text",
-         "value": config.AUDIO_BITRATE,
-         "validate": _validate_bitrate},
-        {"key": "language", "label": "Language", "kind": "text",
-         "value": config.LANGUAGE, "validate": _validate_language},
-        {"key": "chunk_size", "label": "Chunk size (words)", "kind": "text",
-         "value": str(config.CHUNK_SIZE), "validate": _validate_chunk_size},
-    ]
-    result = tui.form(stdscr, "Settings", fields, back_value=_GO_BACK)
-    if result is None or result is _GO_BACK:
-        return
-    try:
-        _apply_settings(result)
-    except ValueError as exc:
-        tui.flash(stdscr, str(exc), "err")
-        return
-    tui.flash(stdscr, "Settings saved.", "ok")
-
-
-def _validate_bitrate(value: str) -> Optional[str]:
-    """Error message for a blank audio bitrate, or None to accept it."""
-    if value.strip():
-        return None
-    return "Audio bitrate must not be empty"
-
-
-def _validate_language(value: str) -> Optional[str]:
-    """Error message for an unrecognized LANGUAGE, or None to accept it."""
-    try:
-        normalize_language(value)
-        return None
-    except ValueError as exc:
-        return str(exc)
-
-
-def _validate_chunk_size(value: str) -> Optional[str]:
-    """Error message for an invalid CHUNK_SIZE, or None to accept it."""
-    try:
-        number = int(value.strip())
-    except ValueError:
-        return "Enter a whole number of words, e.g. 250"
-    if number < 1:
-        return "Chunk size must be at least 1"
-    return None
-
-
-def _apply_settings(values: dict) -> None:
-    """Write VALUES to converter/config.py and reload them in-memory."""
-    chunk_size = int(values["chunk_size"].strip())
-    if chunk_size < 1:
-        raise ValueError("Chunk size must be at least 1")
-    bitrate = values["audio_bitrate"].strip()
-    if not bitrate:
-        raise ValueError("Audio bitrate must not be empty")
-    if values["audio_format"] not in AUDIO_FORMATS:
-        raise ValueError(f"Unsupported audio format: {values['audio_format']}")
-    updates = {
-        "AUDIO_FORMAT": values["audio_format"],
-        "AUDIO_BITRATE": bitrate,
-        "LANGUAGE": normalize_language(values["language"]),
-        "CHUNK_SIZE": chunk_size,
-    }
-    _write_config(updates)
-    for name, value in updates.items():
-        setattr(config, name, value)
-
-
-def _write_config(updates: dict) -> None:
-    """Rewrite the ``NAME = value`` lines for UPDATES in converter/config.py.
-
-    Only the value of each named assignment changes: the indentation, the
-    quotes (double, matching the file's style) and any trailing comment on
-    the line are preserved. Every other line is left untouched.
-    """
-    path = Path(config.__file__).resolve()
-    text = path.read_text(encoding="utf-8")
-    for name, value in updates.items():
-        rendered = str(value) if isinstance(value, int) else f'"{value}"'
-        pattern = re.compile(
-            rf"^(\s*{re.escape(name)}\s*=\s*)(\S*)(\s*(#.*))?$",
-            re.MULTILINE)
-        text, count = pattern.subn(
-            lambda m, rendered=rendered:
-            f"{m.group(1)}{rendered}{m.group(3) or ''}", text)
-        if count != 1:
-            raise ValueError(f"Could not find {name} in {path}")
-    path.write_text(text, encoding="utf-8")
-
-
-def _run_conversion(backend: str, kwargs: dict) -> None:
-    """Run a conversion in the plain console (after the TUI returns).
-
-    When the convert menu recorded an ``autostart`` server (the user opted to
-    have the hub start it), spawn it now and abort the conversion if it does
-    not come up. After the conversion, offer to stop a server we started.
-    """
-    autostart = kwargs.pop("autostart", None)
-    status = next((s for s in detect_all() if s.key == backend), None)
-    if status is not None and not status.ready and not status.running:
-        print(f"[WARNING] {status.label} is not fully set up.")
-    if autostart:
-        spec = _find_spec(autostart)
-        if spec is None:
-            print(f"[WARNING] no server named '{autostart}'; continuing")
-        elif not servers.start(spec):
-            print("[ERROR] could not start the server; aborting conversion.")
-            if status is not None and status.launch_hint:
-                print("Start it manually and run the conversion again:")
-                print(f"  {status.launch_hint}")
-            return
-    elif status is not None and not status.running and status.launch_hint:
-        print("[INFO] Make sure the server is running. Start it with:")
-        print(f"  {status.launch_hint}")
-    try:
-        audiobook.convert(backend=backend, **kwargs)
-    finally:
-        if autostart:
-            _maybe_stop_server(autostart)
-
-
-def _maybe_stop_server(name: str) -> None:
-    """Ask (in the plain console) whether to stop a server we auto-started."""
-    try:
-        ans = input(f"\n[?] Stop the '{name}' server now? [y/N] ").strip().lower()
-    except EOFError:
-        return
-    if ans in ("y", "yes"):
-        servers.stop(name)
-
-
-def _add_autostart(stdscr, cmd: tuple, statuses) -> None:
-    """Offer to auto-start the conversion's target server when it isn't running.
-
-    Records the chosen server spec name as ``kwargs['autostart']`` for
-    ``_run_conversion`` to act on. Mode-aware for qwen (custom vs clone).
-    """
-    _, key, kwargs = cmd
-    status = next((s for s in statuses if s.key == key), None)
-    if status is None or not status.servers:
-        return
-    spec = _select_spec(status, kwargs)
-    if spec is None:
-        return
-    if common.server_running(spec.url):
-        return
-    choice = tui.confirm(stdscr, f"The {status.label} server is not running. "
-                         "Start it automatically?", default=True,
-                         cancel_value=False)
-    if choice is True:
-        kwargs["autostart"] = spec.name
-
-
-def _select_spec(status, kwargs) -> Optional[ServerSpec]:
-    """The server spec this conversion needs (mode-aware for qwen)."""
-    if status.key == BACKEND_QWEN:
-        wanted = "qwen-clone" if kwargs.get("clone") else "qwen-custom"
-        return next((s for s in status.servers if s.name == wanted), None)
-    return status.servers[0] if status.servers else None
-
-
-def _find_spec(name: str) -> Optional[ServerSpec]:
-    """Look up a server spec by name across every backend's detect()."""
-    for st in detect_all():
-        for spec in st.servers:
-            if spec.name == name:
-                return spec
-    return None
-
-
-def _run_server_action(spec_name: str, action: str) -> None:
-    """Run a Start/Stop action in the plain console (after the TUI returns)."""
-    if action == "start":
-        spec = _find_spec(spec_name)
-        if spec is None:
-            print(f"[ERROR] no server named '{spec_name}'")
-            return
-        servers.start(spec)
-    elif action == "stop":
-        servers.stop(spec_name)
-
-
-def _server_menu(stdscr, statuses) -> Optional[tuple]:
-    """Pick a backend, then one of its servers and a Start/Stop action."""
-    candidates = [st for st in statuses if st.servers or st.running]
-    if not candidates:
-        tui.flash(stdscr, "No backend with a server is available. "
-                  "Set one up first.")
-        return None
-    options = [(st.label, st.key) for st in candidates]
-    key = tui.menu(stdscr, "Start / Stop a server", options,
-                   back_value=_GO_BACK)
-    if key is _GO_BACK or key is None:
-        return None
-    status = next((s for s in statuses if s.key == key), None)
-    if status is None:
-        return None
-    return _server_actions(stdscr, status)
-
-
-def _server_actions(stdscr, status) -> Optional[tuple]:
-    """Pick a server spec (qwen has two) and a Start or Stop action."""
-    specs = status.servers
-    if not specs:
-        tui.flash(stdscr, f"{status.label} has no server configured. "
-                  "Run 'Set up a backend' first.")
-        return None
-    if len(specs) == 1:
-        spec = specs[0]
-    else:
-        options = [(f"{s.name}  ({'running' if common.server_running(s.url) else 'stopped'})",
-                    s.name) for s in specs]
-        name = tui.menu(stdscr, f"{status.label} server", options,
-                        back_value=_GO_BACK)
-        if name is _GO_BACK or name is None:
-            return None
-        spec = next((s for s in specs if s.name == name), None)
-        if spec is None:
-            return None
-    running = common.server_running(spec.url)
-    action = tui.menu(
-        stdscr, f"{spec.name}  ({'running' if running else 'stopped'})",
-        [("Start", "start"), ("Stop", "stop")], back_value=_GO_BACK)
-    if action is _GO_BACK or action is None:
-        return None
-    return ("server", spec.name, action)
-
-
-def _list_voices(voice_dir: str) -> list:
-    """Return sorted .wav stems in VOICE_DIR (best-effort)."""
-    try:
-        path = Path(voice_dir)
-        if not path.is_dir():
-            return []
-        return sorted(
-            (p.stem for p in path.iterdir()
-             if p.is_file() and p.suffix.lower() == ".wav"),
-            key=str.lower,
-        )
-    except OSError:
-        return []
-
-
-def _is_float(value: str) -> bool:
-    try:
-        float(value)
-        return True
-    except ValueError:
-        return False
diff --git a/ui/tui.py b/ui/tui.py
deleted file mode 100644
index 9047f36..0000000
--- a/ui/tui.py
+++ /dev/null
@@ -1,1145 +0,0 @@
-#!/usr/bin/env python3
-"""Colorful DOS-style curses TUI widgets for the interactive tools.
-
-Every screen is a dialog centered on a black desktop, like an old DOS
-TUI: a yellow title, colored status messages (green/yellow/red), a
-bright cyan cursor bar, and Yes/No buttons you switch with Tab for
-every yes/no question. Instructions and prompts are centered while
-lists (directory contents, menu options, checkbox trees) are
-left-justified for readability; the black background matches the
-terminal default, so the full-screen repaints curses performs while
-resizing a dialog never flash. One screen per decision: a directory
-browser, an expandable checkbox tree, a single-line text editor, a
-single-choice menu, and a yes/no confirm. There is no framework —
-every widget is a function that runs its own key loop on a curses
-window and returns the chosen value.
-
-Common key bindings:
-
-  Up/Down (or k/j)   move the cursor
-  Enter              accept (the highlighted button or row)
-  Tab or Left/Right  switch Yes/No buttons (confirmations)
-  Esc                abort the whole wizard (raises WizardCancelled);
-                     a widget passed back_value returns that sentinel
-                     instead, so the caller can fall back a screen
-                     (confirm() historically names this cancel_value)
-
-On screens without typed text (menus, confirm, tree, browser) 'q' also
-aborts — even when a back_value is set, so Esc means "back" while 'q'
-still means "quit". Inside text editors 'q' is an ordinary character.
-When the terminal has no color support the theme degrades to
-bold/reverse/dim.
-"""
-
-import contextlib
-import os
-import textwrap
-from pathlib import Path
-from typing import Callable, List, Optional, Sequence, Tuple
-
-# Make Esc register quickly instead of pausing for an escape sequence.
-os.environ.setdefault("ESCDELAY", "25")
-
-
-class WizardCancelled(Exception):
-    """Raised when the user presses Esc to abort the wizard."""
-
-
-@contextlib.contextmanager
-def suspend(scr):
-    """Temporarily leave curses to run plain-console code.
-
-    Long-running steps that stream output to the terminal (cloning a
-    repository, building, pip-installing, transcribing) cannot share the
-    curses screen, so the wizard suspends curses for the duration of the
-    step and repaints the current screen afterward. ``scr`` is the curses
-    window returned to the wrapper callback.
-    """
-    import curses
-    try:
-        curses.endwin()
-    except curses.error:
-        pass
-    try:
-        yield
-    finally:
-        try:
-            scr.redrawwin()
-            scr.refresh()
-        except Exception:
-            pass
-        try:
-            curses.curs_set(0)
-        except curses.error:
-            pass
-
-
-def flash(scr, text: str, kind: str = "warn") -> None:
-    """Show a one-line notice until any key is pressed, then return.
-
-    Used by the hub for "not set up yet"-style messages. KIND is a theme
-    key (warn/err/ok/info). Esc dismisses the notice (it does not abort).
-    """
-    frame = Frame(scr, "Notice", "Press any key to continue  Esc = back")
-    frame.mark(text, frame.theme.get(kind, frame.theme["body"]))
-    frame.cursor = None
-    frame.draw()
-    try:
-        key = scr.getch()
-    except KeyboardInterrupt:
-        raise WizardCancelled() from None
-    if key == 3:  # Ctrl-C still aborts
-        raise WizardCancelled()
-
-
-# Esc and 'q' both abort on screens without typed text ('q' is an
-# ordinary character inside text editors).
-_CANCEL_KEYS = (27, ord("q"))
-
-
-# ---------------------------------------------------------------------------
-# Theme
-# ---------------------------------------------------------------------------
-
-_THEME: dict = {}
-
-
-def _ensure_theme(curses) -> dict:
-    """Build (once) the attribute table for the classic DOS look.
-
-    White text on a black desktop, a cyan border, yellow titles and
-    warnings, green success/check marks, red errors, a black-on-cyan
-    cursor bar and a black-on-green selected button. Black matches the
-    terminal's default background, so the clear-screen repaints curses
-    performs when a dialog changes size never flash. Without colors,
-    everything falls back to bold/reverse/dim attributes.
-    """
-    if _THEME:
-        return _THEME
-    theme = {
-        "desktop": 0,
-        "border": curses.A_BOLD,
-        "title": curses.A_BOLD,
-        "body": 0,
-        "dim": curses.A_DIM,
-        "ok": curses.A_BOLD,
-        "warn": curses.A_BOLD,
-        "err": curses.A_BOLD | curses.A_REVERSE,
-        "info": curses.A_DIM,
-        "input": curses.A_BOLD,
-        "bar": curses.A_REVERSE,
-        "btn_on": curses.A_REVERSE | curses.A_BOLD,
-        "btn_off": curses.A_DIM,
-        "check": curses.A_BOLD,
-        "accent": curses.A_BOLD,
-    }
-    if curses.has_colors():
-        try:
-            curses.start_color()
-            black = curses.COLOR_BLACK
-            pairs = {
-                "desktop": (curses.COLOR_WHITE, black),
-                "border": (curses.COLOR_CYAN, black),
-                "title": (curses.COLOR_YELLOW, black),
-                "ok": (curses.COLOR_GREEN, black),
-                "warn": (curses.COLOR_YELLOW, black),
-                "err": (curses.COLOR_RED, black),
-                "info": (curses.COLOR_WHITE, black),
-                "input": (curses.COLOR_WHITE, black),
-                "bar": (curses.COLOR_BLACK, curses.COLOR_CYAN),
-                "btn_on": (curses.COLOR_BLACK, curses.COLOR_GREEN),
-                "check": (curses.COLOR_GREEN, black),
-                "accent": (curses.COLOR_CYAN, black),
-            }
-            for number, (name, (fg, bg)) in enumerate(pairs.items(), 1):
-                curses.init_pair(number, fg, bg)
-                theme[name] = curses.color_pair(number)
-            theme["dim"] = curses.A_DIM | theme["desktop"]
-            theme["body"] = theme["desktop"]
-            theme["btn_off"] = curses.A_DIM | theme["desktop"]
-            for name in ("title", "ok", "warn", "err", "check", "accent",
-                         "input"):
-                theme[name] |= curses.A_BOLD
-            theme["info"] = curses.A_DIM | theme["info"]
-        except curses.error:
-            pass
-    _THEME.clear()
-    _THEME.update(theme)
-    return _THEME
-
-
-# ---------------------------------------------------------------------------
-# Shared drawing helpers
-# ---------------------------------------------------------------------------
-
-def _addstr(scr, y: int, x: int, text: str, attr: int = 0) -> None:
-    """addstr that ignores out-of-bounds and terminal-capability errors."""
-    try:
-        scr.addstr(y, x, text, attr)
-    except Exception:
-        pass
-
-
-def _addch(scr, y: int, x: int, ch, attr: int = 0) -> None:
-    """addch that ignores out-of-bounds and terminal-capability errors."""
-    try:
-        scr.addch(y, x, ch, attr)
-    except Exception:
-        pass
-
-
-def _hline(scr, y: int, x: int, n: int, attr: int = 0) -> None:
-    """hline of ACS_HLINE that ignores terminal-capability errors."""
-    import curses
-    try:
-        scr.hline(y, x, curses.ACS_HLINE, n, attr)
-    except Exception:
-        pass
-
-
-def _fit(text: str, width: int) -> str:
-    """Truncate TEXT to WIDTH columns, appending '~' when cut."""
-    if width < 1:
-        return ""
-    if len(text) <= width:
-        return text
-    return text[: max(0, width - 1)] + "~"
-
-
-class Frame:
-    """A dialog centered on the black desktop, DOS style.
-
-    Widgets append logical rows with mark()/mark_segments() and call
-    draw() after every state change. Rows are centered by default;
-    list rows pass align="left" to start at a fixed margin from the
-    left border. Rows that are not selectable (help text, the current
-    directory, blank lines) are skipped by the cursor. The selected
-    row is drawn as a full-width bright bar. Below the rows sit the
-    optional Yes/No buttons, a colored one-line status, and a dim
-    footer.
-    """
-
-    MIN_HEIGHT = 8
-    MIN_WIDTH = 30
-    # Columns between the left border and align="left" rows.
-    LIST_MARGIN = 2
-
-    def __init__(self, scr, title: str, footer: str):
-        import curses
-        self.curses = curses
-        self.scr = scr
-        self.title = title
-        self.footer = footer
-        self.theme = _ensure_theme(curses)
-        self.rows: List[dict] = []
-        self.cursor: Optional[int] = None            # logical row index
-        self.status: Optional[Tuple[str, str]] = None  # (text, kind)
-        self.buttons: Optional[Tuple[Sequence[str], int]] = None
-        self.scroll = 0
-        self.page_size = 1
-        try:
-            curses.curs_set(0)
-        except curses.error:
-            pass
-        try:
-            scr.bkgd(" ", self.theme["desktop"])
-        except curses.error:
-            pass
-
-    # -- content ---------------------------------------------------------
-
-    def mark(self, text: str, attr: Optional[int] = None, indent: int = 0,
-             selectable: bool = False, align: str = "center") -> None:
-        """Append a body row (wrapped when longer than the box).
-
-        ALIGN is "center" (the default, for instructions and prompts)
-        or "left" (for lists), which starts the row at a fixed margin
-        from the left border.
-        """
-        if attr is None:
-            attr = self.theme["body"]
-        self.rows.append({"text": text, "segments": None, "attr": attr,
-                          "indent": indent, "selectable": selectable,
-                          "align": align})
-
-    def mark_segments(self, segments: Sequence[Tuple[str, int]],
-                      indent: int = 0, selectable: bool = False,
-                      align: str = "center") -> None:
-        """Append a row of (text, attr) segments (truncated, not wrapped)."""
-        self.rows.append({"text": None, "segments": list(segments),
-                          "attr": 0, "indent": indent,
-                          "selectable": selectable, "align": align})
-
-    def selectable(self) -> List[int]:
-        """Logical indices of the selectable rows, in order."""
-        return [index for index, row in enumerate(self.rows)
-                if row["selectable"]]
-
-    # -- drawing ---------------------------------------------------------
-
-    def _row_width(self, row: dict) -> int:
-        """Logical width of a row, including its indent."""
-        if row["segments"] is not None:
-            return sum(len(text) for text, _ in row["segments"]) \
-                + 2 * row["indent"]
-        return len(row["text"]) + 2 * row["indent"]
-
-    def _measure(self, width: int) -> int:
-        """Dialog width: widest row plus frame, capped to the screen."""
-        longest = max(len(self.title) + 4, len(self.footer) + 4, 40)
-        for row in self.rows:
-            longest = max(longest, self._row_width(row) + 4)
-        if self.status:
-            longest = max(longest, len(self.status[0]) + 6)
-        if self.buttons:
-            labels, _ = self.buttons
-            longest = max(longest,
-                          sum(len(label) + 6 for label in labels) + 4)
-        return min(longest + 4, width - 2)
-
-    def _flatten(self, usable: int) -> List[Tuple[int, dict, Optional[str]]]:
-        """Wrap text rows into physical (logical index, row, piece) lines."""
-        flat: List[Tuple[int, dict, Optional[str]]] = []
-        for index, row in enumerate(self.rows):
-            if row["segments"] is not None:
-                flat.append((index, row, None))
-                continue
-            wrap_width = usable
-            if row["align"] == "left":
-                # Leave room for the list margin, the indent and the
-                # right border so a wrapped line is never re-truncated.
-                wrap_width = usable - 1 - 2 * row["indent"]
-            pieces = textwrap.wrap(row["text"], max(10, wrap_width)) or [""]
-            for piece in pieces:
-                flat.append((index, row, piece))
-        return flat
-
-    def _geometry(self, height: int, width: int, dialog_w: int,
-                  flat: List[Tuple[int, dict, Optional[str]]]
-                  ) -> Tuple[int, int, int, int]:
-        """Place the dialog and scroll the cursor row into view.
-
-        Returns (y0, x0, dialog_h, visible); also refreshes
-        self.scroll and self.page_size.
-        """
-        chrome = 7 if self.buttons else 6  # title/gap/status/footer/borders
-        dialog_h = min(max(self.MIN_HEIGHT, len(flat) + chrome), height)
-        visible = max(1, dialog_h - chrome)
-        self.page_size = max(1, visible)
-        if self.cursor is not None:
-            positions = [i for i, (logical, _, _) in enumerate(flat)
-                         if logical == self.cursor]
-            if positions:
-                first, last = positions[0], positions[-1]
-                if first < self.scroll:
-                    self.scroll = first
-                elif last >= self.scroll + visible:
-                    self.scroll = last - visible + 1
-        self.scroll = max(0, min(self.scroll, max(0, len(flat) - visible)))
-        y0 = max(0, (height - dialog_h) // 2)
-        x0 = max(0, (width - dialog_w) // 2)
-        return y0, x0, dialog_h, visible
-
-    def draw(self) -> None:
-        scr = self.scr
-        scr.erase()
-        height, width = scr.getmaxyx()
-        if height < self.MIN_HEIGHT or width < self.MIN_WIDTH:
-            msg = "Terminal too small"
-            _addstr(scr, height // 2, max(0, (width - len(msg)) // 2),
-                    msg, self.curses.A_BOLD)
-            scr.refresh()
-            return
-        dialog_w = self._measure(width)
-        flat = self._flatten(dialog_w - 4)
-        y0, x0, dialog_h, visible = self._geometry(height, width,
-                                                   dialog_w, flat)
-        self._draw_frame(y0, x0, dialog_h, dialog_w, len(flat), visible)
-        self._draw_rows(y0, x0, dialog_w, flat, visible)
-        self._draw_buttons(y0, x0, dialog_h, dialog_w)
-        self._draw_status_footer(y0, x0, dialog_h, dialog_w)
-        scr.refresh()
-
-    def _draw_frame(self, y0: int, x0: int, dialog_h: int, dialog_w: int,
-                    total_lines: int, visible: int) -> None:
-        curses, theme = self.curses, self.theme
-        scr = self.scr
-        border = theme["border"]
-        _addch(scr, y0, x0, curses.ACS_ULCORNER, border)
-        _addch(scr, y0, x0 + dialog_w - 1, curses.ACS_URCORNER, border)
-        _addch(scr, y0 + dialog_h - 1, x0, curses.ACS_LLCORNER, border)
-        _addch(scr, y0 + dialog_h - 1, x0 + dialog_w - 1,
-               curses.ACS_LRCORNER, border)
-        _hline(scr, y0, x0 + 1, dialog_w - 2, border)
-        _hline(scr, y0 + dialog_h - 1, x0 + 1, dialog_w - 2, border)
-        for y in range(y0 + 1, y0 + dialog_h - 1):
-            _addch(scr, y, x0, curses.ACS_VLINE, border)
-            _addch(scr, y, x0 + dialog_w - 1, curses.ACS_VLINE, border)
-
-        inner_x = x0 + 1
-        inner_w = dialog_w - 2
-        title = _fit(f" {self.title} ", inner_w)
-        _addstr(scr, y0 + 1, inner_x + max(0, (inner_w - len(title)) // 2),
-                title, theme["title"])
-        if total_lines > visible:
-            indicator = f" {self.scroll + 1}/{total_lines} "
-            _addstr(scr, y0, max(x0 + 1, x0 + dialog_w - 1 - len(indicator)),
-                    indicator, theme["dim"])
-
-    def _draw_rows(self, y0: int, x0: int, dialog_w: int,
-                   flat: List[Tuple[int, dict, Optional[str]]],
-                   visible: int) -> None:
-        theme = self.theme
-        scr = self.scr
-        inner_x = x0 + 1
-        inner_w = dialog_w - 2
-        for line in range(self.scroll, min(len(flat), self.scroll + visible)):
-            logical, row, piece = flat[line]
-            y = y0 + 2 + (line - self.scroll)
-            selected = logical == self.cursor and row["selectable"]
-            if selected:
-                _addstr(scr, y, inner_x, " " * inner_w, theme["bar"])
-            if row["segments"] is not None:
-                self._draw_segments_row(y, row, inner_x, inner_w, selected)
-            else:
-                self._draw_text_row(y, row, piece, inner_x, inner_w,
-                                    selected)
-
-    def _draw_segments_row(self, y: int, row: dict, inner_x: int,
-                           inner_w: int, selected: bool) -> None:
-        scr, theme = self.scr, self.theme
-        total = sum(len(text) for text, _ in row["segments"])
-        if row["align"] == "left":
-            x = inner_x + self.LIST_MARGIN + 2 * row["indent"]
-        else:
-            x = inner_x + max(0, (inner_w - total) // 2) \
-                + 2 * row["indent"]
-        # Never paint over the right border column.
-        room = max(0, inner_x + inner_w - 1 - x)
-        for text, attr in row["segments"]:
-            text = _fit(text, room)
-            if not text:
-                break
-            _addstr(scr, y, x, text, theme["bar"] if selected else attr)
-            x += len(text)
-            room -= len(text)
-
-    def _draw_text_row(self, y: int, row: dict, piece: Optional[str],
-                       inner_x: int, inner_w: int, selected: bool) -> None:
-        scr, theme = self.scr, self.theme
-        text = "  " * row["indent"] + piece
-        if row["align"] == "left":
-            x = inner_x + self.LIST_MARGIN
-            limit = inner_w - 1 - self.LIST_MARGIN - 2 * row["indent"]
-        else:
-            x = inner_x + max(0, (inner_w - len(text)) // 2)
-            limit = inner_w
-        text = _fit(text, limit)
-        attr = theme["bar"] if selected else row["attr"]
-        _addstr(scr, y, x, text, attr)
-
-    def _draw_buttons(self, y0: int, x0: int, dialog_h: int,
-                      dialog_w: int) -> None:
-        if not self.buttons:
-            return
-        theme = self.theme
-        scr = self.scr
-        inner_x = x0 + 1
-        inner_w = dialog_w - 2
-        labels, selected = self.buttons
-        rendered = [f"[ {label} ]" for label in labels]
-        total = sum(len(r) for r in rendered) + 3 * (len(rendered) - 1)
-        x = inner_x + max(0, (inner_w - total) // 2)
-        y = y0 + dialog_h - 4
-        for index, text in enumerate(rendered):
-            if index:
-                x += 3
-            _addstr(scr, y, x, text,
-                    theme["btn_on"] if index == selected
-                    else theme["btn_off"])
-            x += len(text)
-
-    def _draw_status_footer(self, y0: int, x0: int, dialog_h: int,
-                            dialog_w: int) -> None:
-        theme = self.theme
-        scr = self.scr
-        inner_x = x0 + 1
-        inner_w = dialog_w - 2
-        if self.status:
-            text, kind = self.status
-            attr = theme.get(kind, theme["body"])
-            text = _fit(f" {text} ", inner_w)
-            _addstr(scr, y0 + dialog_h - 3,
-                    inner_x + max(0, (inner_w - len(text)) // 2),
-                    text, attr)
-        footer = _fit(self.footer, inner_w)
-        _addstr(scr, y0 + dialog_h - 2,
-                inner_x + max(0, (inner_w - len(footer)) // 2),
-                footer, theme["dim"])
-
-    # -- key helpers ------------------------------------------------------
-
-    def motion(self, key: int, cursor: int, count: int,
-               wrap: bool = False) -> Optional[int]:
-        """New cursor index for a motion KEY, or None when it moves nothing.
-
-        Up/Down (or k/j) move one row, wrapping around at the ends when
-        WRAP is set (menus and trees) and clamping otherwise (the
-        browser); Home/End jump to the first/last row; PageUp/PageDown
-        move self.page_size rows. COUNT is the number of rows.
-        """
-        curses = self.curses
-        if key in (curses.KEY_UP, ord("k")):
-            if wrap and cursor <= 0:
-                return count - 1
-            return max(0, cursor - 1)
-        if key in (curses.KEY_DOWN, ord("j")):
-            if wrap and cursor >= count - 1:
-                return 0
-            return min(count - 1, cursor + 1)
-        if key == curses.KEY_HOME:
-            return 0
-        if key == curses.KEY_END:
-            return count - 1
-        if key == curses.KEY_PPAGE:
-            return max(0, cursor - self.page_size)
-        if key == curses.KEY_NPAGE:
-            return min(count - 1, cursor + self.page_size)
-        return None
-
-    def get_key(self, cancel_keys: Sequence[int] = (27,)) -> int:
-        """Read one key; cancel keys and Ctrl-C raise WizardCancelled."""
-        try:
-            key = self.scr.getch()
-        except KeyboardInterrupt:
-            raise WizardCancelled() from None
-        if key == 3:  # Ctrl-C
-            raise WizardCancelled()
-        if key in cancel_keys:
-            raise WizardCancelled()
-        return key
-
-    def flash(self, text: str, kind: str = "err") -> None:
-        """Show TEXT on the status line until any key is pressed."""
-        self.status = (text, kind)
-        self.draw()
-        try:
-            key = self.scr.getch()
-            if key == 3:  # Ctrl-C still aborts
-                raise WizardCancelled()
-        except KeyboardInterrupt:
-            raise WizardCancelled() from None
-        self.status = None
-
-    def edit_status(self, prompt: str = "") -> Optional[str]:
-        """Edit a line of text on the status line.
-
-        Returns the edited string on Enter, or None when the user backs
-        out with Esc (the caller decides what that means).
-        """
-        curses = self.curses
-        text = ""
-        while True:
-            self.status = (f"{prompt}{text}_", "input")
-            self.draw()
-            try:
-                key = self.scr.getch()
-            except KeyboardInterrupt:
-                raise WizardCancelled() from None
-            if key == 27:
-                return None
-            if key == 3:  # Ctrl-C
-                raise WizardCancelled()
-            if key in (10, 13):
-                return text
-            if key in (curses.KEY_BACKSPACE, 8, 127):
-                text = text[:-1]
-            elif 32 <= key < 127:
-                text += chr(key)
-
-
-# ---------------------------------------------------------------------------
-# Widget: yes/no confirm with buttons
-# ---------------------------------------------------------------------------
-
-def confirm(scr, question: str, default: bool = False,
-            body: Optional[Sequence[str]] = None,
-            cancel_value: object = None):
-    """Ask a yes/no QUESTION with centered Yes/No buttons.
-
-    The QUESTION is the dialog title (shown exactly once); optional
-    BODY lines sit centered above the buttons. Tab or the arrow keys
-    switch the buttons, Enter activates the highlighted one (the
-    DEFAULT button starts highlighted, drawn bright against the dim
-    other one), and y/n answer directly. Esc (or 'q') aborts the
-    wizard — unless CANCEL_VALUE is given (not None), in which case it
-    is returned instead, so the caller can fall back to a previous
-    screen rather than aborting the whole wizard.
-    """
-    frame = Frame(scr, question,
-                  "Tab/arrows = switch  Enter = confirm  y/n  Esc = cancel")
-    index = 0 if default else 1
-    while True:
-        frame.rows = []
-        for line in body or []:
-            frame.mark(line)
-        frame.cursor = None
-        frame.buttons = (["Yes", "No"], index)
-        frame.draw()
-        curses = frame.curses
-        key = frame.get_key(cancel_keys=())
-        if key in _CANCEL_KEYS:
-            if cancel_value is not None:
-                return cancel_value
-            raise WizardCancelled()
-        if key in (9, curses.KEY_LEFT, curses.KEY_RIGHT, curses.KEY_UP,
-                   curses.KEY_DOWN, curses.KEY_BTAB, ord("h"), ord("l")):
-            index = 1 - index
-        elif key in (ord("y"), ord("Y")):
-            return True
-        elif key in (ord("n"), ord("N")):
-            return False
-        elif key in (10, 13):
-            return index == 0
-
-
-# ---------------------------------------------------------------------------
-# Widget: single-choice menu
-# ---------------------------------------------------------------------------
-
-def menu(scr, title: str, options: Sequence[tuple], default_index: int = 0,
-         help_lines: Optional[Sequence[str]] = None,
-         back_value: object = None,
-         table_title: Optional[str] = None,
-         table_rows: Optional[Sequence[tuple]] = None):
-    """Show OPTIONS as (label, value) pairs; return the chosen value.
-
-    The cursor starts on DEFAULT_INDEX; Enter returns the highlighted
-    option's value. Options are left-justified like a DOS list;
-    HELP_LINES are dim, centered explanatory lines shown above them.
-
-    TABLE_TITLE + TABLE_ROWS render an aligned two-column table above the
-    options: each row is (name, status, kind) where KIND is a theme key
-    ("ok"/"warn"/"err"/"info"/...), optionally followed by NAME_KIND, a
-    theme key for the name column ("dim" to fade an unusable entry;
-    "body" — the default — otherwise). The name column is padded to the
-    widest name so every status starts at the same column — a monospace
-    grid. The title is dim and left-aligned with the rows. Used by the
-    hub to show each backend's state (unavailable / installed / running)
-    in matching columns with color.
-
-    Esc (or 'q') aborts the wizard unless BACK_VALUE is given (not None),
-    in which case Esc returns it so the caller can fall back a screen.
-    """
-    if not options:
-        raise ValueError("menu() needs at least one option")
-    frame = Frame(scr, title,
-                  "Up/Down = move  Enter = select  Esc = cancel")
-    cursor = max(0, min(default_index, len(options) - 1))
-    while True:
-        frame.rows = []
-        for line in help_lines or []:
-            frame.mark(line, frame.theme["dim"])
-        if help_lines:
-            frame.mark("")
-        if table_rows:
-            if table_title:
-                frame.mark(table_title, frame.theme["dim"], align="left")
-            name_w = max(len(row[0]) for row in table_rows)
-            for row in table_rows:
-                name, status, kind = row[0], row[1], row[2]
-                name_kind = row[3] if len(row) > 3 else "body"
-                frame.mark_segments(
-                    [(name.ljust(name_w),
-                      frame.theme.get(name_kind, frame.theme["body"])),
-                     ("  " + status,
-                      frame.theme.get(kind, frame.theme["body"]))],
-                    align="left")
-            frame.mark("")
-        base = len(frame.rows)
-        for label, _ in options:
-            frame.mark(label, selectable=True, align="left")
-        frame.cursor = base + cursor
-        frame.draw()
-        key = frame.get_key(cancel_keys=())
-        if key == 27 and back_value is not None:
-            return back_value
-        if key in _CANCEL_KEYS:
-            raise WizardCancelled()
-        moved = frame.motion(key, cursor, len(options), wrap=True)
-        if moved is not None:
-            cursor = moved
-        elif key in (10, 13):
-            return options[cursor][1]
-
-
-# ---------------------------------------------------------------------------
-# Widget: single-line text editor
-# ---------------------------------------------------------------------------
-
-def line_edit(scr, title: str, default: str,
-              validate: Optional[Callable[[str], Optional[str]]] = None,
-              help_lines: Optional[Sequence[str]] = None,
-              back_value: object = None) -> str:
-    """Edit one line of text, pre-filled with DEFAULT; Enter accepts.
-
-    HELP_LINES are dim explanatory lines shown above the input.
-    VALIDATE receives the entered string and returns an error message
-    or None; Enter on an invalid value shows the message in red and
-    keeps editing. Esc aborts the wizard ('q' is an ordinary
-    character here) unless BACK_VALUE is given (not None), in which case
-    Esc returns it so the caller can fall back a screen.
-    """
-    frame = Frame(scr, title,
-                  "type to edit  Backspace = erase  Enter = accept  "
-                  "Esc = cancel")
-    text = default
-    error = None
-    while True:
-        frame.rows = []
-        for line in help_lines or []:
-            frame.mark(line, frame.theme["dim"])
-        frame.mark("")
-        frame.mark(f"{text}_", frame.theme["input"])
-        frame.cursor = None
-        frame.status = (error, "err") if error else None
-        frame.draw()
-        curses = frame.curses
-        key = frame.get_key(cancel_keys=())  # handle Esc manually below
-        if key == 27 and back_value is not None:
-            return back_value
-        if key == 27:
-            raise WizardCancelled()
-        if key in (10, 13):
-            if validate is None:
-                return text
-            error = validate(text)
-            if error is None:
-                return text
-            continue
-        if key in (curses.KEY_BACKSPACE, 8, 127):
-            text = text[:-1]
-        elif key == 21:  # Ctrl-U: clear the line
-            text = ""
-        elif 32 <= key < 127:
-            text += chr(key)
-
-
-# ---------------------------------------------------------------------------
-# Widget: multi-field settings form with Save/Cancel buttons
-# ---------------------------------------------------------------------------
-
-def form(scr, title: str, fields: Sequence[dict],
-         back_value: object = None,
-         help_lines: Optional[Sequence[str]] = None) -> Optional[dict]:
-    """Edit several labeled fields on one screen, then Save or Cancel.
-
-    FIELDS is a list of dicts, one per row, shaped like::
-
-        {"key": "audio_format", "label": "Audio format",
-         "kind": "choice", "value": "m4b",
-         "choices": ["mp3", "m4b", "ogg", "flac"]}
-        {"key": "chunk_size", "label": "Chunk size",
-         "kind": "text", "value": "250",
-         "validate": lambda s: None if s.isdigit() else "digits only"}
-
-    Each field renders as a left-justified ``Label:  value`` row. Up/Down
-    (or k/j) move the cursor; Enter on a ``choice`` row opens a single
-    choice menu, Enter on a ``text`` row opens a line editor (reusing its
-    VALIDATE for that one field). Tab or the arrow keys move focus to the
-    Save/Cancel buttons; Enter on Save validates every text field (the
-    first failure flashes in red and re-focuses that row) and returns
-    ``{key: value}``, Enter on Cancel returns BACK_VALUE. Esc (or 'q')
-    returns BACK_VALUE / aborts as in menu(). Values are edited in place
-    in the FIELDS dicts, so Cancel simply discards them.
-    """
-    if not fields:
-        raise ValueError("form() needs at least one field")
-    frame = Frame(scr, title,
-                  "Up/Down = move  Enter = edit  Tab = Save/Cancel  "
-                  "Esc = cancel")
-    cursor = 0
-    on_buttons = False
-    btn_index = 0
-    edit_cancel = object()  # sentinel: backed out of a field editor
-    while True:
-        frame.rows = []
-        for line in help_lines or []:
-            frame.mark(line, frame.theme["dim"])
-        if help_lines:
-            frame.mark("")
-        base = len(frame.rows)
-        for field in fields:
-            frame.mark(f"{field['label']}:  {field['value']}",
-                       selectable=True, align="left")
-        frame.cursor = None if on_buttons else base + cursor
-        frame.buttons = (["Save", "Cancel"], btn_index if on_buttons else None)
-        frame.draw()
-        curses = frame.curses
-        key = frame.get_key(cancel_keys=())
-        if key == 27 and back_value is not None:
-            return back_value
-        if key in _CANCEL_KEYS:
-            raise WizardCancelled()
-        if on_buttons:
-            if key in (9, curses.KEY_BTAB, curses.KEY_UP, curses.KEY_DOWN):
-                on_buttons = False
-            elif key in (curses.KEY_LEFT, curses.KEY_RIGHT,
-                         ord("h"), ord("l")):
-                btn_index = 1 - btn_index
-            elif key in (10, 13):
-                if btn_index == 0:  # Save
-                    for index, field in enumerate(fields):
-                        validate = field.get("validate")
-                        if field.get("kind") == "text" and validate:
-                            error = validate(field["value"])
-                            if error is not None:
-                                on_buttons = False
-                                cursor = index
-                                frame.flash(error, "err")
-                                break
-                    else:
-                        return {field["key"]: field["value"]
-                                for field in fields}
-                else:  # Cancel
-                    return back_value
-        else:
-            moved = frame.motion(key, cursor, len(fields), wrap=True)
-            if moved is not None:
-                cursor = moved
-            elif key in (9, curses.KEY_BTAB, curses.KEY_LEFT,
-                         curses.KEY_RIGHT, ord("h"), ord("l")):
-                on_buttons = True
-                btn_index = 0
-            elif key in (10, 13):
-                field = fields[cursor]
-                if field.get("kind") == "choice":
-                    choices = list(field.get("choices") or [])
-                    default = choices.index(field["value"]) \
-                        if field["value"] in choices else 0
-                    chosen = menu(scr, field["label"],
-                                  [(c, c) for c in choices],
-                                  default_index=default,
-                                  back_value=edit_cancel)
-                    if chosen is not edit_cancel:
-                        field["value"] = chosen
-                else:
-                    edited = line_edit(scr, field["label"], field["value"],
-                                       validate=field.get("validate"),
-                                       back_value=edit_cancel)
-                    if edited is not edit_cancel:
-                        field["value"] = edited
-
-
-# ---------------------------------------------------------------------------
-# Widget: directory browser
-# ---------------------------------------------------------------------------
-
-def _list_dirs(path: Path) -> List[Path]:
-    """Return the subdirectories of PATH, sorted, dot-dirs excluded."""
-    try:
-        entries = [child for child in path.iterdir()
-                   if child.is_dir() and not child.name.startswith(".")]
-    except OSError:
-        return []
-    return sorted(entries, key=lambda child: child.name.lower())
-
-
-def browse_directory(scr, title: str,
-                     validate: Optional[Callable[[Path], Optional[str]]] = None,
-                     start: Optional[Path] = None,
-                     info: Optional[Callable[[Path],
-                                             Optional[Tuple[str, str]]]] = None,
-                     preview: Optional[Callable[[Path],
-                                                Optional[Tuple[str, str]]]] = None,
-                     help_lines: Optional[Sequence[str]] = None,
-                     auto_select: Optional[Callable[
-                         [Path], Optional[Path]]] = None,
-                     back_value: object = None
-                     ) -> Path:
-    """Pick a directory DOS-browser style.
-
-    The listing starts with a bright '[ Use this directory ]' row (the
-    cursor starts there; Enter accepts the directory being listed), a
-    dim '..' for the parent, and one row per subdirectory. List rows
-    are left-justified; instructions and the current path stay
-    centered. Enter or Right on a highlighted subdirectory opens it,
-    Left/Backspace goes to the parent, 'e' types a path directly, and
-    Home/End/PageUp/PageDown navigate long listings. Coming back out
-    of a directory highlights the directory you came from.
-
-    VALIDATE receives the listed directory and returns an error message
-    or None; Enter on an invalid directory is refused with that message.
-    INFO(directory) returns a (text, kind) status shown under the
-    listed directory's path — kind is "ok" (green), "warn" (yellow),
-    "err" (red), "info" (dim) or "input". PREVIEW(directory) returns
-    one for the highlighted subdirectory, shown on the status line.
-    AUTO_SELECT receives a highlighted subdirectory when the user
-    opens it (Enter, Right or 'l') and may return a Path to accept
-    immediately — as if '[ Use this directory ]' had been pressed on
-    it — instead of descending; returning None keeps browsing. This
-    lets a subdirectory that already looks like the target (e.g. an
-    'audio.cpp' checkout containing 'model_specs/') be picked in one
-    keystroke. Esc (or 'q') aborts the wizard unless BACK_VALUE is given
-    (not None), in which case Esc returns it so the caller can fall back
-    a screen.
-    """
-    footer = ("Up/Down = move  Enter = open/use  Left = parent  "
-              "e = type path  Esc = cancel")
-    frame = Frame(scr, title, footer)
-    current = Path(start) if start is not None else Path.cwd()
-    try:
-        current = current.resolve()
-    except OSError:
-        current = Path.cwd()
-    sel = 0
-    highlight: Optional[Path] = None
-
-    def validation_error() -> Optional[str]:
-        if validate is None:
-            return None
-        try:
-            return validate(current)
-        except OSError:
-            return "Cannot read this directory"
-
-    def call(callback, path: Path) -> Optional[Tuple[str, str]]:
-        if callback is None:
-            return None
-        try:
-            return callback(path)
-        except OSError:
-            return None
-
-    while True:
-        entries = _list_dirs(current)
-        has_parent = current.parent != current
-        offset = 1 + (1 if has_parent else 0)
-        frame.rows = []
-        for line in help_lines or []:
-            frame.mark(line, frame.theme["dim"])
-        frame.mark(f"Directory: {current}", frame.theme["accent"])
-        current_info = call(info, current)
-        if current_info:
-            frame.mark(current_info[0],
-                       frame.theme.get(current_info[1], frame.theme["body"]))
-        frame.mark("")
-        frame.mark("[ Use this directory ]", frame.theme["ok"],
-                   selectable=True, align="left")
-        if has_parent:
-            frame.mark("..", frame.theme["dim"], selectable=True,
-                       align="left")
-        for entry in entries:
-            frame.mark(f"{entry.name}/", selectable=True, align="left")
-        selectable = frame.selectable()
-        if highlight is not None:
-            sel = 0
-            for index, entry in enumerate(entries):
-                if entry == highlight:
-                    sel = offset + index
-                    break
-            highlight = None
-        sel = max(0, min(sel, len(selectable) - 1))
-        frame.cursor = selectable[sel] if selectable else None
-
-        if sel == 0:
-            frame.status = ("Enter = use this directory", "info")
-        elif has_parent and sel == 1:
-            frame.status = ("Enter = open the parent directory", "info")
-        else:
-            entry = entries[sel - offset]
-            frame.status = call(preview, entry) \
-                or (f"Enter = open {entry.name}/", "info")
-        frame.draw()
-        curses = frame.curses
-        key = frame.get_key(cancel_keys=())
-        if key == 27 and back_value is not None:
-            return back_value
-        if key in _CANCEL_KEYS:
-            raise WizardCancelled()
-        moved = frame.motion(key, sel, len(selectable))
-        if moved is not None:
-            sel = moved
-        elif key in (10, 13, curses.KEY_RIGHT, ord("l")):
-            if sel == 0:
-                error = validation_error()
-                if error is None:
-                    return current
-                frame.flash(f"{error}  (keep browsing)", "err")
-            elif has_parent and sel == 1:
-                highlight = current
-                current = current.parent
-            else:
-                entry = entries[sel - offset]
-                if auto_select is not None:
-                    picked = auto_select(entry)
-                    if picked is not None:
-                        return picked
-                current = entry
-                sel = 0
-        elif key in (curses.KEY_LEFT, ord("h"), ord("u"),
-                     curses.KEY_BACKSPACE, 8, 127):
-            if has_parent:
-                highlight = current
-                current = current.parent
-        elif key == ord("e"):
-            result = frame.edit_status(prompt="path: ")
-            if result:
-                candidate = Path(os.path.expanduser(result))
-                if not candidate.is_absolute():
-                    candidate = current / candidate
-                try:
-                    candidate = candidate.resolve()
-                except OSError:
-                    pass
-                if candidate.is_dir():
-                    current = candidate
-                    sel = 0
-                else:
-                    frame.flash(f"Not a directory: {candidate}", "err")
-
-
-# ---------------------------------------------------------------------------
-# Widget: expandable checkbox tree
-# ---------------------------------------------------------------------------
-
-def checkbox_tree(scr, title: str, families: List[dict],
-                  footer: Optional[str] = None,
-                  expand_all: bool = False,
-                  back_value: object = None) -> List[Tuple[int, str]]:
-    """Pick model families and packages from an expandable tree.
-
-    FAMILIES is a list of dicts (one per family) shaped like::
-
-        {
-            "label": "Qwen3-TTS (qwen3_tts)",
-            "detail": "tts, cloning, design",
-            "options": [
-                {"key": "Base-GGUF", "label": "base", "recommended": True},
-                {"key": "VoiceDesign-GGUF", "label": "voicedesign",
-                 "recommended": False},
-            ],
-        }
-
-    Space on a family row checks its recommended option (or clears every
-    option when one is already checked); Space on an option row toggles
-    that option. Tab/Right expands or collapses the family under the
-    cursor. Enter returns the flat list of (family_index, option_key)
-    pairs for every checked option, in tree order; at least one checked
-    option is required. Nothing is checked by default, and with
-    EXPAND_ALL every family starts expanded. A "[recommended]" tag is
-    shown only when a
-    family has more than one option — a single option needs no tag.
-    Family and option rows are left-justified like a DOS list. Esc (or
-    'q') aborts the wizard unless BACK_VALUE is given (not None), in
-    which case Esc returns it so the caller can fall back a screen.
-    """
-    if not families:
-        raise ValueError("checkbox_tree() needs at least one family")
-    footer = footer or ("Up/Down = move  Tab/Right = expand  Space = check  "
-                        "Enter = accept  Esc = cancel")
-    frame = Frame(scr, title, footer)
-    expanded = {index for index in range(len(families))} if expand_all else set()
-    checked = set()  # (family_index, option_key)
-
-    expanded.add(0)
-
-    def family_checked(index: int) -> bool:
-        return any(pair[0] == index for pair in checked)
-
-    def accept() -> List[Tuple[int, str]]:
-        return [(index, option["key"])
-                for index, family in enumerate(families)
-                for option in family["options"]
-                if (index, option["key"]) in checked]
-
-    def visible_nodes() -> List[tuple]:
-        nodes: List[tuple] = []  # ("family", i) or ("option", i, key)
-        for index, family in enumerate(families):
-            nodes.append(("family", index))
-            if index in expanded:
-                for option in family["options"]:
-                    nodes.append(("option", index, option["key"]))
-        return nodes
-
-    cursor = 0
-    while True:
-        nodes = visible_nodes()
-        cursor = max(0, min(cursor, len(nodes) - 1))
-        frame.rows = []
-        for node in nodes:
-            if node[0] == "family":
-                index = node[1]
-                family = families[index]
-                on = family_checked(index)
-                mark = "x" if on else " "
-                arrow = "-" if index in expanded else "+"
-                frame.mark_segments(
-                    [(f"[{mark}] ",
-                      frame.theme["check"] if on else frame.theme["dim"]),
-                     (f"{arrow} {family['label']}",
-                      frame.theme["accent"] if on else frame.theme["body"])],
-                    selectable=True, align="left")
-            else:
-                _, index, option_key = node
-                option = next(opt for opt in families[index]["options"]
-                              if opt["key"] == option_key)
-                is_on = (index, option_key) in checked
-                mark = "x" if is_on else " "
-                segments = [(f"[{mark}] ",
-                             frame.theme["check"] if is_on
-                             else frame.theme["dim"]),
-                            (option["label"], frame.theme["body"])]
-                if option.get("recommended") \
-                        and len(families[index]["options"]) > 1:
-                    segments.append(("  [recommended]", frame.theme["warn"]))
-                frame.mark_segments(segments, indent=2, selectable=True,
-                                    align="left")
-        frame.cursor = cursor
-        node = nodes[cursor]
-        frame.status = (families[node[1]].get("detail", ""), "info")
-        frame.draw()
-        curses = frame.curses
-        key = frame.get_key(cancel_keys=())
-        if key == 27 and back_value is not None:
-            return back_value
-        if key in _CANCEL_KEYS:
-            raise WizardCancelled()
-        moved = frame.motion(key, cursor, len(nodes), wrap=True)
-        if moved is not None:
-            cursor = moved
-        elif key in (9, curses.KEY_RIGHT, ord("l")) and node[0] == "family":
-            index = node[1]
-            if index in expanded:
-                expanded.discard(index)
-            else:
-                expanded.add(index)
-        elif key == curses.KEY_LEFT and node[0] == "family":
-            expanded.discard(node[1])
-        elif key == ord(" "):
-            if node[0] == "family":
-                index = node[1]
-                options = families[index]["options"]
-                if family_checked(index):
-                    for option in options:
-                        checked.discard((index, option["key"]))
-                else:
-                    for option in options:
-                        if option.get("recommended"):
-                            checked.add((index, option["key"]))
-                            break
-                    else:
-                        if options:
-                            checked.add((index, options[0]["key"]))
-                    expanded.add(index)
-            else:
-                _, index, option_key = node
-                if (index, option_key) in checked:
-                    checked.discard((index, option_key))
-                else:
-                    checked.add((index, option_key))
-        elif key in (10, 13):  # Enter: accept the checked selection
-            selection = accept()
-            if selection:
-                return selection
-            frame.flash("Check at least one model package (Space)", "err")