feat(terminal): refactor runtime and add mobile workspace (#2280)

Replace the legacy terminal flow with a shared authenticated WebSocket
runtime used across web, desktop, relay, and mobile surfaces.

- introduce the v3 terminal protocol with scoped attachments, snapshots,
  ordered output, bounded replay history, reconnects, and explicit lifecycle
- harden PTY creation, restart, resize, close, force-kill, idle cleanup,
  shell selection, login mode, environment sanitization, and appearance sync
- add runtime-aware terminal APIs with relay authentication and Electron parity
- add a fullscreen mobile terminal workspace with touch scrolling,
  long-press selection, safe-area controls, quick keys, and Ctrl/Alt input
- add terminal selection attachments, preview detection, project actions,
  shell settings, and localized UI
- harden Ghostty rendering, resize recovery, Unicode handling, block
  characters, line height, and stale-row behavior
- remove the obsolete terminal SSE path and update reverse-proxy guidance
- expand terminal runtime, transport, input, selection, and store coverage
- avoid duplicate web builds when preparing mobile assets in root CI builds

packages/mobile/README.md

@@ -11,12 +11,14 @@ The mobile package reuses the web build, then rewrites `mobile.html` to `index.h
 - Connections are saved locally in the app and can be managed from the mobile overflow menu under `Instances`.
 - The connection screen and `Instances` menu item are Capacitor-only. Hosted `mobile.html` in a normal browser keeps the regular web behavior.
 - Password-protected OpenChamber servers can be unlocked from the mobile app. The app stores the issued client token with the saved connection.
+- The Terminal workspace surface runs its PTY on the active OpenChamber server over the shared authenticated runtime transport; it never opens a local shell on the phone or tablet. Closing the surface detaches the renderer while the server session remains available for reattachment. On touch devices, dragging scrolls the buffer while long-pressing and dragging selects terminal text.
 
 ## Commands
 
 Run these from `packages/mobile`, or use the root `mobile:*` aliases.
 
 - `bun run build`: builds `packages/web` and prepares mobile web assets.
+- `bun run build:assets`: prepares mobile assets from an existing `packages/web/dist` build; the root workspace build uses this to avoid rebuilding web.
 - `bun run sync`: prepares assets and runs `cap sync`.
 - `bun run add:ios`: creates the native iOS project.
 - `bun run add:android`: creates the native Android project.

packages/mobile/package.json

@@ -4,7 +4,8 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "build": "bun run --cwd ../web build && node scripts/prepare-web-assets.mjs",
+    "build": "bun run --cwd ../web build && bun run build:assets",
+    "build:assets": "node scripts/prepare-web-assets.mjs",
     "sync": "node scripts/with-mobile-env.mjs \"bun run build && cap sync\"",
     "add:ios": "cap add ios",
     "add:android": "cap add android",