feat: add tag_dao to InsightGenerator for tag-based context enrichment

Threads SqliteTagDao through InsightGenerator and AppState (both default
and test_state). Adds Send+Sync bounds to TagDao trait with unsafe impls
for SqliteTagDao (always Mutex-protected) and TestTagDao (single-threaded).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/state.rs

@@ -5,6 +5,7 @@ use crate::database::{
     SqliteLocationHistoryDao, SqliteSearchHistoryDao,
 };
 use crate::database::{PreviewDao, SqlitePreviewDao};
+use crate::tags::{SqliteTagDao, TagDao};
 use crate::video::actors::{
     PlaylistGenerator, PreviewClipGenerator, StreamActor, VideoPlaylistManager,
 };
@@ -119,6 +120,8 @@ impl Default for AppState {
             Arc::new(Mutex::new(Box::new(SqliteLocationHistoryDao::new())));
         let search_dao: Arc<Mutex<Box<dyn SearchHistoryDao>>> =
             Arc::new(Mutex::new(Box::new(SqliteSearchHistoryDao::new())));
+        let tag_dao: Arc<Mutex<Box<dyn TagDao>>> =
+            Arc::new(Mutex::new(Box::new(SqliteTagDao::default())));
 
         // Load base path
         let base_path = env::var("BASE_PATH").expect("BASE_PATH was not set in the env");
@@ -133,6 +136,7 @@ impl Default for AppState {
             calendar_dao.clone(),
             location_dao.clone(),
             search_dao.clone(),
+            tag_dao.clone(),
             base_path.clone(),
         );
 
@@ -196,6 +200,8 @@ impl AppState {
             Arc::new(Mutex::new(Box::new(SqliteLocationHistoryDao::new())));
         let search_dao: Arc<Mutex<Box<dyn SearchHistoryDao>>> =
             Arc::new(Mutex::new(Box::new(SqliteSearchHistoryDao::new())));
+        let tag_dao: Arc<Mutex<Box<dyn TagDao>>> =
+            Arc::new(Mutex::new(Box::new(SqliteTagDao::default())));
 
         // Initialize test InsightGenerator with all data sources
         let base_path_str = base_path.to_string_lossy().to_string();
@@ -208,6 +214,7 @@ impl AppState {
             calendar_dao.clone(),
             location_dao.clone(),
             search_dao.clone(),
+            tag_dao.clone(),
             base_path_str.clone(),
         );