feat(desktop): Live launcher in the composer like the web app - #45

ditto-app#3432 puts a waveform Live mode launcher in the composer just left of Send and moves Temporary chat to the header. pingdotgg#3432 isn't merged, and bumping the submodule to it breaks the desktop build right now, so Ditto Desktop still showed the temporary-chat clock beside Send and had no Live entry in the composer.

What changed

• New build-time bridge scripts/desktop-live-launcher-bridge.cjs, applied by build-web.cjs on top of the chat and computer overlays, which edit the same two files. It does three things:
  • Composer (SendMessage.tsx): removes the temporary-chat slot and renders renderer/DesktopLiveLauncher.tsx first in the send slot. It's hidden in the Code start view and while a separate Stop is showing, like [codex] Diagnose desktop client settings read failures pingdotgg/t3code#3432. It also removes the old PhoneCall "Live mode" entries that [codex] Diagnose desktop client settings read failures pingdotgg/t3code#3432 removes (they were in the + menu and the hidden media fallback).
  • Header (V2Shell.tsx): adds renderer/DesktopHeaderTemporaryChat.tsx right after the search trigger, as [codex] Diagnose desktop client settings read failures pingdotgg/t3code#3432 does. It shows on chat, new-chat and temporary surfaces. It reads as pressed on Temporary Chats, and pressing it again goes back to Chats.
  • All or nothing: the composer and header changes apply together or not at all, so Temporary chat never loses its entry point. Each anchor must match exactly once, or nothing is patched.
• Launcher: same markup as [codex] Diagnose desktop client settings read failures pingdotgg/t3code#3432's LiveModeButton: data-testid="live-mode-launcher" data-placement="composer", AudioLines icon, the "Talk to Ditto by voice" tooltip with a ⌘ ⇧ L key hint, and aria-keyshortcuts. While Live is off its label is "Start live mode". It's aria-disabled with "Uploading files..." during an upload.
  • Click and state: clicking calls window.ditto.liveToggle(). The pressed state follows liveStatus() plus onLiveActive. Main sends ditto:live-active on every transition, so the launcher, the rail button, Cmd+Shift+L and the menu stay in sync. A late initial liveStatus() never overrides a newer push.
  • Difference from [codex] Diagnose desktop client settings read failures pingdotgg/t3code#3432: there, clicking while active opens the web expanded view. On desktop, clicking while active stops Live, matching the rail button, and the label reads "Stop live mode".
• CSS (renderer/desktopLiveLauncher.css): the launcher, kbd and header-toggle styles from [codex] Diagnose desktop client settings read failures pingdotgg/t3code#3432's liveDock.css and v2.css, plus [codex] Diagnose desktop client settings read failures pingdotgg/t3code#3432's 3-column composer grid at ≥1024px.
• Future-proofing: if the bundled ditto-app already contains live-mode-launcher / LiveModeButton or header-temporary-chat, the bridge is a no-op. feat(desktop): live mode drives Ditto through the web orchestrator #41's startLiveMode patch already sends ditto-app's own launcher to the aura.
• The rail Live button and Cmd+Shift+L are unchanged. docs/ditto/live-mode.md now lists the composer entry point.

Surfaces checked (dev build, isolated home)

Home/new chat, a chat thread, an agent chat (Main Ditto) and Temporary chat all show one launcher, at wide and narrow widths. The Code tab shows no launcher and no header toggle.

	Before	After
Wide composer
Narrow composer (<1024px)
Full window

Tooltip with shortcut hint:

Active styling:
(Shown by setting data-active from devtools. I didn't start a real Live session in the dev build, since that drives Computer Use. The state sync is covered by tests.)

Temporary chat from the header (pressed), launcher still in the composer:

Agent chat: Chat thread: Code tab (no launcher):

Tests

• tests/live-launcher.node-test.cjs covers the patch result, idempotence, any missing anchor leaving both files untouched, the skip when ditto-app ships its own launcher or header toggle, active-state sync (a push beats a late status, unsubscribe on dispose), and the platform shortcut hint.
• node --experimental-strip-types --test tests/*.node-test.cjs: 236/237 passed. The one failure, computer-service "setup runs independently…", is a 15s readiness timeout under full-suite load. That file is untouched here and passes 7/7 on its own.
• vp run check:changed: format, lint, knip and typecheck all pass.
• node apps/desktop/scripts/build-web.cjs builds, and the submodule is left clean afterwards.

Screenshots are on the pr-assets/live-composer-launcher ref, not in this branch.

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