Remove all theme switching, creation, and management functionality
from the app — backend (Rust theme module, Tauri commands, menu items,
startup tasks, vault seeding), frontend (useThemeManager, ThemePropertyEditor,
themeSchema, command palette Appearance group, settings panel appearance
section, isDarkTheme prop chain), mock data, and all related tests.
Editor styling via theme.json/EditorTheme.css is preserved (not user theming).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add multi-window support: notes can be opened in dedicated secondary
Tauri windows with editor-only layout (no sidebar, no note list).
Triggers: Cmd+Shift+Click on notes, Cmd+K → "Open in New Window",
Cmd+Shift+O shortcut, Note → "Open in New Window" menu bar item.
Secondary windows have their own auto-save, theme, and wikilink
navigation. Closing a secondary window does not affect the main window.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
