feat(calendar): add DateStrip context menu with display settings

- Add context menu for DateStrip with toggle switches for:
  - Moon phases visibility
  - Event indicators visibility
  - Weekday names visibility
  - Weekend highlighting (subtle background color)
  - Month divider lines (spacing always present, line toggleable)
  - Compact mode
- Add glass effect to "Today" button matching PillNav styling
- Add toggle switch support to shared ContextMenu component
- Persist all settings to localStorage with cloud sync support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/shared-ui/src/context-menu/types.ts

@@ -20,6 +20,10 @@ export interface ContextMenuItem {
 	action?: () => void;
 	/** Additional data attached to the item */
 	data?: unknown;
+	/** Show a toggle switch (for boolean settings) */
+	toggle?: boolean;
+	/** Current toggle state (only used when toggle is true) */
+	checked?: boolean;
 }
 
 export interface ContextMenuState<T = unknown> {