Phase 3: Integrate Google Takeout context into InsightGenerator

- Updated InsightGenerator struct with calendar, location, and search DAOs
- Implemented hybrid context gathering methods:
  * gather_calendar_context(): ±7 days with semantic ranking
  * gather_location_context(): ±30 min with GPS proximity check
  * gather_search_context(): ±30 days semantic search
- Added haversine_distance() utility for GPS calculations
- Updated generate_insight_for_photo_with_model() to use multi-source context
- Combined all context sources (SMS + Calendar + Location + Search) with equal weight
- Initialized new DAOs in AppState (both default and test implementations)
- All contexts are optional (graceful degradation if data missing)

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

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

src/database/mod.rs

@@ -19,15 +19,15 @@ pub mod schema;
 pub mod search_dao;
 
 pub use calendar_dao::{
-    CalendarEvent, CalendarEventDao, InsertCalendarEvent, SqliteCalendarEventDao,
+    CalendarEventDao, SqliteCalendarEventDao,
 };
 pub use daily_summary_dao::{DailySummaryDao, InsertDailySummary, SqliteDailySummaryDao};
 pub use embeddings_dao::{EmbeddingDao, InsertMessageEmbedding};
 pub use insights_dao::{InsightDao, SqliteInsightDao};
 pub use location_dao::{
-    InsertLocationRecord, LocationHistoryDao, LocationRecord, SqliteLocationHistoryDao,
+    LocationHistoryDao, SqliteLocationHistoryDao,
 };
-pub use search_dao::{InsertSearchRecord, SearchHistoryDao, SearchRecord, SqliteSearchHistoryDao};
+pub use search_dao::{SearchHistoryDao, SqliteSearchHistoryDao};
 
 pub trait UserDao {
     fn create_user(&mut self, user: &str, password: &str) -> Option<User>;