perf: preload events and CalDAV config to avoid empty screens

Add CaldavConfigStore and preloadAppData() to load events (current month)
and CalDAV config into stores before dismissing the auth loading spinner.
This prevents the brief empty flash when first navigating to Calendar or
Settings tabs. Also applies Prettier formatting across codebase.

apps/server/src/services/interfaces/AIProvider.ts

@@ -11,7 +11,10 @@ export interface AIContext {
   currentDate: Date;
   // Callback to load events from a specific date range
   // Returns ExpandedEvent[] with occurrenceStart/occurrenceEnd for recurring events
-  fetchEventsInRange: (startDate: Date, endDate: Date) => Promise<ExpandedEvent[]>;
+  fetchEventsInRange: (
+    startDate: Date,
+    endDate: Date,
+  ) => Promise<ExpandedEvent[]>;
   // Callback to search events by title
   searchEvents: (query: string) => Promise<CalendarEvent[]>;
   // Callback to fetch a single event by ID