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/messages/terminalContext.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect, test } from 'bun:test';
+import { appendTerminalContexts, extractTerminalContexts, normalizeTerminalContext, terminalContextKey } from './terminalContext';
+
+const context = {
+  terminalId: 'term-1', terminalLabel: 'Terminal 1', startLine: 12, endLine: 13, text: 'one\r\ntwo',
+};
+
+describe('terminal context serialization', () => {
+  test('normalizes immutable selection snapshots and line ranges', () => {
+    expect(normalizeTerminalContext(context)).toEqual({ ...context, text: 'one\ntwo' });
+    expect(normalizeTerminalContext({ ...context, text: '\n\n' })).toBeNull();
+    expect(normalizeTerminalContext({ ...context, startLine: -2, endLine: 0 })?.startLine).toBe(1);
+  });
+
+  test('serializes multiple contexts without exposing the block in visible text', () => {
+    const serialized = appendTerminalContexts('fix this', [context, { ...context, terminalId: 'term-2', terminalLabel: 'Build', startLine: 2, endLine: 2, text: 'failed' }]);
+    const parsed = extractTerminalContexts(serialized);
+    expect(parsed.visibleText).toBe('fix this');
+    expect(parsed.contexts).toEqual([
+      { terminalLabel: 'Terminal 1', startLine: 12, endLine: 13, text: 'one\ntwo' },
+      { terminalLabel: 'Build', startLine: 2, endLine: 2, text: 'failed' },
+    ]);
+  });
+
+  test('ignores expired contexts and provides deterministic deduplication keys', () => {
+    expect(appendTerminalContexts('hello', [{ ...context, text: '' }])).toBe('hello');
+    expect(terminalContextKey(context)).toBe(terminalContextKey({ ...context }));
+  });
+});