feat(tui): add open menu for sessions and projects

[kitlangton]

What

Adds an open menu to the v2 TUI on ctrl+o: one dialog to jump to a recent session in any project or open a different project, replacing the projects-only DialogProject. Also fixes the session list's all-projects toggle so it remembers its state across opens.

1. Open menu, empty query — recent sessions across all projects (open tabs excluded, they're already one keystroke away in the strip), then all projects recency-sorted.

Open
> 

Sessions
  merman flowchart bug      merman · 3h
  effect atom docs          effect · 1d

Projects
  life-hub    ~/code/open-source/life-hub
  dotfiles    ~/.dotfiles

2. Typing — client-side fuzzy over everything, including open tabs (marked with a ▪ gutter), so matching a tab by name still switches to it.

3. Enter on a session — navigates there; cross-project sessions re-point the TUI location and join the tab strip like any other visit.

4. Enter on a project — home route in that project, fresh prompt (same behavior DialogProject had).

Demo

Recorded end-to-end with opencode-drive against an isolated instance (three seeded projects, tabs enabled): open menu from home, enter on the most recent session, fuzzy cross-project jump, tab-marked match, then a project pick landing on a fresh home.

open-menu-final.mp4

How

• fix(tui): persist session list all-projects toggle — dialog-session-list.tsx swaps the createSignal(false) for a useStorage() store (session-list.json), so ctrl+a state survives reopen and restart.
• feat(tui): add open menu for sessions and projects
  • New packages/tui/src/component/dialog-open.tsx: renders instantly from the local store; one background session.list({ limit: 50, order: "desc", parentID: null }) fills in other-project recents. No debounced server search — deep history search stays the session list's job (the no-match view points there).
  • keybind.ts: new open_menu binding, default ctrl+o, mapped to command open.menu; open.menu added to appGlobalBindingCommands so the binding registers (palette commands are bind: false by default).
  • app.tsx: open.menu command (slash /open, aliases /projects, /project) replaces project.switch; dialog-project.tsx is deleted — the projects tier is a strict superset of it.
• feat(tui): free ctrl+o for the open menu by removing tab history navigation
  • Removes the session.tab.history.back/forward commands and the session_tab_history_back (ctrl+o) / session_tab_history_forward (ctrl+i) keybinds, plus the now-unused public history() on the tabs context.
  • The internal tab history stays: closing a tab still returns to the previously viewed one.
  • Note: configs that override the two removed keybind names will now fail keybind validation ("Unrecognized keybind"), and ctrl+i is freed.

Scope

• No tabs tier in the empty state by design: tabs are visible in the strip already; the menu shows what you can't see.
• Session management (delete/rename/pin) stays in the session list; Enter is the only verb here.

Testing

• bun typecheck in packages/tui — clean.
• bun run test in packages/tui — 573 pass, 5 skip, 0 fail (tab-history keybind assertions removed with the feature).
• End-to-end via opencode-drive against this branch: ctrl+o opens the menu, empty state shows cross-project recents with correct project labels + all projects, fuzzy filter narrows both groups, Enter on a cross-project session re-points location and opens a tab, open tabs show the ▪ marker when matched by typing, Enter on a project lands on home in that project (recording above).