feat(opentui-v2): Phase 5c — model picker + skills hub (generic Picker overlay)
A reusable generic picker (titled <select> + onPick) powers two more first-class
overlays (spec §2b):
- view/overlays/picker.tsx + store picker/openPicker/closePicker + PickerItem.
- /model: bare → model.options → a picker of authenticated providers' models
(current marked ✓), pick switches via `slash.exec model <name>`; `/model <name>`
switches directly without the picker.
- /skills: skills.manage {action:list} → a picker flattened from
{category: names[]}; picking inspects (skills.manage inspect) → the pager.
- view/App.tsx: the input zone is now a <Switch> — prompt → switcher → picker →
composer (overlays replace, never stack, so the composer remounts/refocuses).
Verified: bun run check green (47 tests / 7 files) — /model bare→picker (auth
filtered, current marked, pick→slash.exec), /model <name> direct, /skills flatten.
LIVE tmux: /model → picker listing 8 models (anthropic/claude-opus-4.8 ▶, nous,
…), Esc closed clean; /skills → hub listing skills w/ category descriptions.
5 of 6 first-class overlays done (prompts, pager, session switcher, model picker,
skills hub) — completions dropdown remains. Smoke P5c + matrix updated.
(Note: model.options is ~5s server-side; a loading indicator is a polish TODO.)
alt-glitch
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