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/ui/src/lib/terminalTheme.ts

@@ -77,10 +77,10 @@ export function getGhosttyTerminalOptions(
   const augmentedFontFamily = `${fontFamily}, ${powerlineFallbacks}`;
 
   return {
+    // TerminalViewport enables blinking only while its input owns focus.
     cursorBlink: false,
     cursorStyle: 'bar' as const,
     fontSize,
-    lineHeight: 1.15,
     fontFamily: augmentedFontFamily,
     allowTransparency: false,
     theme: {