feat(search): add SearchHit type (T8.2, FR-SEARCH-1)

Same fields as MeetingListItem plus a highlighted snippet of what matched.

src-tauri/src/models.rs

@@ -118,6 +118,18 @@ pub struct MeetingListItem {
     pub status: MeetingStatus,
 }
 
+/// One full-text search hit (Phase 8, FR-SEARCH-1) — the same shape as
+/// `MeetingListItem` plus a highlighted excerpt of what matched.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SearchHit {
+    pub id: MeetingId,
+    pub title: String,
+    pub started_at: i64,
+    pub duration_secs: Option<i64>,
+    pub status: MeetingStatus,
+    pub snippet: String,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct ActionItem {
     pub id: Option<String>,