feat: Phase 5 complete — themes, editor, shortcuts, workspace, settings
Theme service: 7 built-in themes seeded from Rust, ThemePicker
loads from backend. Workspace service: save/load snapshots, crash
recovery detection. SettingsModal: full port with Tauri invoke.
CommandPalette, HostKeyDialog, ConnectionEditDialog all ported.
CodeMirror editor: inline above terminal, reads/writes via SFTP.
Full keyboard shortcuts: Ctrl+K/W/Tab/Shift+Tab/1-9/B/F.
Terminal search bar via Ctrl+F (SearchAddon).
Tab badges: protocol dots, ROOT warning, environment pills.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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