fix: sweep select now covers all tracks

- Removed sweepTrackIdRef filter in mouseup handler:
  all tracks are scanned for intersecting items.
- Removed track ID check from sweep overlay rendering:
  overlay appears on every track (not just drag-start track).
- Fixed stale closure by adding sweepSelectRef.

app/static/js/app.jsx

@@ -11903,14 +11903,12 @@ const App = () => {
       if (!isSweepingRef.current) return;
       isSweepingRef.current = false;
       const sweep = sweepSelectRef.current;
-      if (sweep && sweepTrackIdRef.current) {
-        const tId = sweepTrackIdRef.current;
+      if (sweep) {
         const start = Math.min(sweep.startTime, sweep.endTime);
         const end = Math.max(sweep.startTime, sweep.endTime);
         const curTracks = activeTracksRef.current || [];
         const found = new Set();
         curTracks.forEach(t => {
-          if (t.id !== tId) return;
           (t.midiItems || []).forEach(m => {
             if (m.startTime < end && m.startTime + m.duration > start) {
               found.add(m.id);
@@ -16536,7 +16534,7 @@ const App = () => {
       }), /*#__PURE__*/React.createElement("div", {
         className: "absolute -right-[1px] top-0 bottom-0 w-[2px] bg-amber-400 z-30 pointer-events-auto cursor-ew-resize",
         onMouseDown: e => handleHandleDragStart(e, 'right')
-      })), sweepSelect && sweepTrackIdRef.current === track.id && /*#__PURE__*/React.createElement("div", {
+      })), sweepSelect && /*#__PURE__*/React.createElement("div", {
         className: "absolute top-0 bottom-0 border-l border-r border-amber-400 bg-amber-500/10 z-20 pointer-events-none",
         style: {
           left: `${Math.min(sweepSelect.startTime, sweepSelect.endTime) * zoom}px`,