fix(tui): reset terminal modes on startup and exit

Reset sticky mouse/focus/paste terminal modes before the TUI starts and during graceful shutdown paths so stale tab state from prior crashes cannot poison the next session.

ui-tui/src/__tests__/terminalModes.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect, it, vi } from 'vitest'
+
+import { resetTerminalModes, TERMINAL_MODE_RESET } from '../lib/terminalModes.js'
+
+describe('terminal mode reset', () => {
+  it('includes the sticky input modes Hermes enables', () => {
+    expect(TERMINAL_MODE_RESET).toContain('\x1b[?1006l')
+    expect(TERMINAL_MODE_RESET).toContain('\x1b[?1003l')
+    expect(TERMINAL_MODE_RESET).toContain('\x1b[?1002l')
+    expect(TERMINAL_MODE_RESET).toContain('\x1b[?1000l')
+    expect(TERMINAL_MODE_RESET).toContain('\x1b[?1004l')
+    expect(TERMINAL_MODE_RESET).toContain('\x1b[?2004l')
+    expect(TERMINAL_MODE_RESET).toContain('\x1b[?1049l')
+  })
+
+  it('writes reset sequence to TTY streams without fds', () => {
+    const write = vi.fn()
+
+    expect(resetTerminalModes({ isTTY: true, write } as unknown as NodeJS.WriteStream)).toBe(true)
+    expect(write).toHaveBeenCalledWith(TERMINAL_MODE_RESET)
+  })
+
+  it('skips non-TTY streams', () => {
+    const write = vi.fn()
+
+    expect(resetTerminalModes({ isTTY: false, write } as unknown as NodeJS.WriteStream)).toBe(false)
+    expect(write).not.toHaveBeenCalled()
+  })
+})