add tag-album and clean-playlist-files tasks, script step support, stop fix, rename fix

- New tag-album task: renames tracks to NNN format, sets ID3 tags via mutagen
- New clean-playlist-files task: deletes .cue, .m3u, .nfo and similar junk files
- Pipeline executor now supports script-mode steps (runs directly, no agent)
- Build discography pipeline: convert-audio → clean-playlist-files → prepare → fetch → tag
- Fix stop button: abort signal now kills running agent processes
- Fix job manager: broadcast stopped/error events to WebSocket viewers
- Fix file browser rename: delay focus to avoid context menu close race, left-align input

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

src/workspaces/officerdev/src/apps/FileBrowser/FileBrowserApp/components/FileItem.tsx

@@ -368,13 +368,14 @@ const InlineRenameInput = ({
 }) => {
   const [value, setValue] = useState(initialName);
   const inputRef = useRef<HTMLInputElement | null>(null);
-  const focused = useRef(false);
+  const ready = useRef(false);
 
   useEffect(() => {
     const node = inputRef.current;
-    if (!node || focused.current) return;
-    focused.current = true;
-    requestAnimationFrame(() => {
+    if (!node) return;
+    // Delay focus to let the context menu fully close and avoid focus races
+    const timer = setTimeout(() => {
+      ready.current = true;
       node.focus();
       const dotIndex = initialName.lastIndexOf('.');
       if (dotIndex > 0) {
@@ -382,7 +383,8 @@ const InlineRenameInput = ({
       } else {
         node.select();
       }
-    });
+    }, 50);
+    return () => clearTimeout(timer);
   }, []);
 
   const commit = () => {
@@ -399,13 +401,17 @@ const InlineRenameInput = ({
       ref={inputRef}
       value={value}
       onChange={(ev) => setValue(ev.target.value)}
-      onBlur={commit}
+      onBlur={() => {
+        // Ignore blur before the input is ready (context menu closing steals focus)
+        if (!ready.current) return;
+        commit();
+      }}
       onKeyDown={(ev) => {
         if (ev.key === 'Enter') commit();
         if (ev.key === 'Escape') onCancel();
       }}
       onClick={(ev) => ev.stopPropagation()}
-      className="text-sm font-medium text-duck-dark bg-background border border-duck-teal/50 rounded px-1 py-0.5 outline-none w-full text-center"
+      className="text-sm font-medium text-duck-dark bg-background border border-duck-teal/50 rounded px-1 py-0.5 outline-none max-w-full text-left"
     />
   );
 };