feat(search): add search command; route notes.md writes through the store (T8.2, FR-SEARCH-1)

The initial notes.md render after finalize/resume/recovery bypassed
the Store abstraction entirely (raw std::fs::write) — routing it
through update_notes means that first render also gets FTS-indexed and
bumps updated_at, instead of only later manual edits doing either.

src-tauri/src/commands.rs

@@ -495,7 +495,7 @@ pub async fn stop_recording(
         .map_err(|e| WaError::new("storage", e.to_string()))?;
 
     let notes_md = crate::notes::MarkdownNotes.to_markdown(&segments, &speakers, None);
-    let _ = std::fs::write(meeting_dir(&meeting_id).join("notes.md"), notes_md);
+    let _ = state.store.update_notes(&meeting_id, &notes_md).await;
 
     let _ = app.emit(
         "transcript://finalized",
@@ -899,7 +899,7 @@ pub async fn reprocess_transcript(
         .map_err(|e| WaError::new("storage", e.to_string()))?;
 
     let notes_md = crate::notes::MarkdownNotes.to_markdown(&segments, &meeting.speakers, None);
-    let _ = std::fs::write(meeting_dir(&meeting_id).join("notes.md"), notes_md);
+    let _ = state.store.update_notes(&meeting_id, &notes_md).await;
 
     let _ = app.emit(
         "transcript://finalized",
@@ -981,7 +981,7 @@ pub async fn resume_transcription(
         .map_err(|e| WaError::new("storage", e.to_string()))?;
 
     let notes_md = crate::notes::MarkdownNotes.to_markdown(&segments, &speakers, None);
-    let _ = std::fs::write(meeting_dir(&meeting_id).join("notes.md"), notes_md);
+    let _ = state.store.update_notes(&meeting_id, &notes_md).await;
 
     let _ = app.emit(
         "transcript://finalized",
@@ -1004,6 +1004,18 @@ pub async fn list_meetings(
         .map_err(|e| WaError::new("storage", e.to_string()))
 }
 
+/// Full-text search across transcripts + notes (Phase 8, FR-SEARCH-1) —
+/// distinct from `list_meetings`' `query`, which only substring-matches the
+/// title.
+#[tauri::command]
+pub async fn search(state: State<'_, AppState>, query: String) -> WaResult<Vec<SearchHit>> {
+    state
+        .store
+        .search(&query)
+        .await
+        .map_err(|e| WaError::new("storage", e.to_string()))
+}
+
 #[tauri::command]
 pub async fn get_meeting(state: State<'_, AppState>, meeting_id: MeetingId) -> WaResult<Meeting> {
     state