feat(opentui-v2): Phase 5c — session switcher overlay (list → pick → resume)
A first-class picker (spec §2b, Ink activeSessionSwitcher): /sessions (aliases
/resume, /switch, /session) → session.list → a native <select> overlay; Enter
resumes the chosen session via the SAME resumeInto hydrate path as launch, so
tool rows + transcript hydrate correctly. Esc closes. Reuses Phase 4b resume.
- view/overlays/sessionSwitcher.tsx: <select> of sessions (title / preview /
message count), onSelect → onPick(id); Esc cancels.
- store: switcher state + openSwitcher/closeSwitcher; SessionItem type.
- logic/resume.ts: mapSessionList(session.list result) → SessionItem[].
- logic/slash.ts: /sessions|/resume|/switch|/session client commands +
listSessions/openSwitcher on SlashContext.
- entry: resumeInto extracted (shared by bootstrap + switcher); slashCtx wires
listSessions (session.list → mapSessionList) + openSwitcher; onResume runs
resumeInto via runFork. App input zone is now prompt → switcher → composer
(overlays replace, not stack, so the composer remounts/refocuses on close).
Verified: bun run check green (43 tests / 7 files) — slash /sessions → switcher,
+ a switcher frame test (rows render, composer replaced). LIVE tmux: /sessions
listed real titled sessions w/ counts/previews; ↓+Enter resumed the picked one
(hydrate_ms=8) → transcript hydrated incl. the ⚡terminal tool row; switcher
closed, composer returned; /quit clean. 3 of 6 first-class overlays done
(prompts, pager, switcher). Smoke P5c + matrix updated.
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