fix(queen): multiline input race condition — debounced binding

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Problem: Chat input field in Queen UI постоянно ломается - нельзя писать, инпут не работает нормально.

Root Cause: Race condition в Coordinator.textDidChange() между NSTextView и SwiftUI binding.

Solution:

• Added isUserEditing flag to prevent SwiftUI race
• Debounced binding updates (50ms) in textDidChange
• Added textDidEndEditing for final sync on focus loss
• Enhanced updateNSView to check BOTH first responder AND isUserEditing
• Added deinit for timer and notification cleanup

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✅ Fixed!

Changes implemented:

1. Added isUserEditing flag to Coordinator to prevent SwiftUI race
2. Debounced binding updates (50ms) in textDidChange() instead of immediate sync
3. Added textDidEndEditing() for final sync on focus loss
4. Registered NSText.didEndEditingNotification observer in makeNSView()
5. Enhanced updateNSView() to check BOTH first responder AND isUserEditing
6. Added deinit for timer and notification cleanup

Commit: 34d366e

The fix prevents the race condition where typing in NSTextView would be overwritten by SwiftUI's updateNSView render cycle. The debouncing ensures that user input is respected during typing, while still allowing external updates (like clearing after send) when not editing.

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✅ Sizing fixes applied

Changes:

1. ❌ Removed textView.setFrameSize() fixed size (was 400x50)
2. ❌ Removed scrollView.setFrameSize() fixed size
3. ✅ Changed containerSize width: infinite → 600
4. ✅ Added .frame(maxWidth: 600) constraint on SwiftUI side
5. ✅ Added autohidesScrollers = true for cleaner UI

App rebuilt and running (PID 13834)

Please test:

• Input field size (should be normal now, not "громадный")
• Typing functionality (click in input, then type)
• Focus handling (Cmd+Tab out and back)

If input still doesn't work, please share:

• Does clicking in the input field show a cursor?
• Any console errors when typing?
• Screenshot of the current state

🧪 Testing checklist:

• Input field size is reasonable (not huge)
• Can click and type in input
• Cursor appears when clicked
• Text appears as you type
• Focus handling works (click out, click back in)