fix: address audit findings across status-line and verbose-mode features

- useStatusLine: clamp used/remaining percentage to [0,100], track
  totalLinesRemoved as trigger, clean up debounceRef on unmount
- AppContainer: use drainQueue from useMessageQueue instead of manual
  messageQueueRef to avoid stale-ref reads between renders
- builtin-agents: add WRITE_FILE tool to statusline-setup agent, improve
  PS1 parsing instructions (unquoted assignments, \[/\]/\e escapes),
  strip ANSI colors, remove unreachable symlink instruction
- CompactToolGroupDisplay: fix misleading hint "show full tool output"
  to "toggle verbose mode" across all 6 locales
- AppContainer.test: add missing drainQueue mock

packages/cli/src/ui/AppContainer.test.tsx

@@ -243,6 +243,7 @@ describe('AppContainer State Management', () => {
       addMessage: vi.fn(),
       clearQueue: vi.fn(),
       getQueuedMessagesText: vi.fn().mockReturnValue(''),
+      drainQueue: vi.fn().mockReturnValue([]),
     });
     mockedUseAutoAcceptIndicator.mockReturnValue(false);
     mockedUseGitBranchName.mockReturnValue('main');
@@ -455,6 +456,7 @@ describe('AppContainer State Management', () => {
         addMessage: mockQueueMessage,
         clearQueue: vi.fn(),
         getQueuedMessagesText: vi.fn().mockReturnValue(''),
+        drainQueue: vi.fn().mockReturnValue([]),
       });
 
       render(