fix: Improve keyboard shortcuts and window management

[eyelock]

Summary

Fixes power user keyboard shortcuts to follow standard macOS conventions and improve window management during Phase 1 testing.

Changes

Keyboard Shortcuts

• Cmd+W: Now closes window (keeps app running, preserves sessions)
  • Standard macOS behavior like Notes, Mail, etc.
  • App stays in dock with dot indicator
  • Can reopen from dock to restore session
• Cmd+Shift+W: Closes current tab (moved from Cmd+W)
  • Avoids conflict with standard window close
  • More specific action for tab management
• Cmd+Option+Z: Toggle zoom mode
  • Moved from Cmd+Shift+Z to avoid Redo conflict
  • Cmd+Shift+Z is standard macOS Redo shortcut

Window Management

• Red X button: Now shows confirmation dialog when terminals running
  • Matches Cmd+Q confirmation behavior
  • Prevents accidental session loss
  • Window closes properly (hides, doesn't minimize)
• Window close: Properly hides window using orderOut(nil)
  • Previously was minimizing to dock
  • Now correctly closes/hides window

Documentation

• Updated Docs/Help/keyboard-shortcuts.md with:
  • New "Window & Application" section
  • All current shortcuts organized by category
  • Standard macOS shortcuts (Cmd+M, Cmd+H, Cmd+,)

Testing

All shortcuts tested and working:

• ✅ Cmd+W closes window, app stays running
• ✅ Cmd+Shift+W closes current tab
• ✅ Cmd+Q shows confirmation when terminals running
• ✅ Red X button shows confirmation and closes window
• ✅ Cmd+Option+Z toggles zoom mode
• ✅ No conflicts with standard macOS shortcuts

Technical Details

• Window delegate setup uses polling to handle SwiftUI window lifecycle
• windowShouldClose delegate method handles confirmation
• orderOut(nil) properly hides window without minimizing
• No breaking changes to existing functionality

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🤖 Generated with Claude Code

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.