feat(ai-tags): add reset flow

Add a reset_ai_tags backend command that removes AI-generated tag rows, clears AI tagging metadata, cancels active tagging jobs, and drops queued or failed tagging jobs in the selected scope.

Expose reset actions in AI Workspace and the Explore tag manager, refresh gallery/progress/tag state after reset, and add subtle AI source indicators to tag manager rows.

src-tauri/src/commands.rs

@@ -2179,6 +2179,12 @@ pub struct ClearTaggingJobsParams {
     pub folder_ids: Option<Vec<i64>>,
 }
 
+#[derive(Deserialize)]
+pub struct ResetAiTagsParams {
+    pub folder_id: Option<i64>,
+    pub folder_ids: Option<Vec<i64>>,
+}
+
 #[derive(Deserialize)]
 pub struct GetImageTagsParams {
     pub image_id: i64,
@@ -2377,6 +2383,42 @@ pub async fn clear_tagging_jobs(
     Ok(n)
 }
 
+#[tauri::command]
+pub async fn reset_ai_tags(
+    app: AppHandle,
+    db: State<'_, DbState>,
+    params: ResetAiTagsParams,
+) -> Result<usize, String> {
+    let conn = db.get().map_err(|e| e.to_string())?;
+    let requested_folder_ids = params.folder_ids.unwrap_or_default();
+    let (n, folder_ids): (usize, Vec<i64>) =
+        match (params.folder_id, requested_folder_ids.is_empty()) {
+            (Some(id), _) => (
+                db::reset_ai_tags(&conn, Some(id)).map_err(|e| e.to_string())?,
+                vec![id],
+            ),
+            (None, false) => {
+                let mut total = 0usize;
+                for &folder_id in &requested_folder_ids {
+                    total += db::reset_ai_tags(&conn, Some(folder_id))
+                        .map_err(|e| e.to_string())?;
+                }
+                (total, requested_folder_ids)
+            }
+            (None, true) => (
+                db::reset_ai_tags(&conn, None).map_err(|e| e.to_string())?,
+                db::get_folders(&conn)
+                    .map_err(|e| e.to_string())?
+                    .into_iter()
+                    .map(|f| f.id)
+                    .collect(),
+            ),
+        };
+    drop(conn);
+    indexer::emit_folder_job_progress(&app, db.inner(), &folder_ids, true);
+    Ok(n)
+}
+
 #[tauri::command]
 pub async fn get_image_tags(
     db: State<'_, DbState>,