fix: drag clamp, pitch anchor, Ctrl+A, marquee dir, resize snap

app/static/js/app.jsx

@@ -4563,6 +4563,18 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
     window.addEventListener('mouseup', up);
     return () => window.removeEventListener('mouseup', up);
   }, []);
+  React.useEffect(() => {
+    const handler = (e) => {
+      if ((e.ctrlKey || e.metaKey) && e.key === 'a') {
+        const target = e.target;
+        if (target && (target.tagName === 'INPUT' || target.tagName === 'TEXTAREA' || target.isContentEditable)) return;
+        e.preventDefault();
+        setSelectedNoteIds(notes.map(n => n.id));
+      }
+    };
+    window.addEventListener('keydown', handler);
+    return () => window.removeEventListener('keydown', handler);
+  }, [notes, setSelectedNoteIds]);
 
   const NoteHeight = 18;
   const PITCH_START = 0; // C0 (render all 128 keys)
@@ -5065,7 +5077,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
         mode: 'move',
         idx: clickedNoteIdx,
         startOffsetBeat: beat - clickedNote.start_beat,
-        startOffsetPitch: pitch - clickedNote.pitch,
+        startOffsetPitch: pitch,
         selectedNotesOffset: selectedNotesOffset
       });
     } else {
@@ -5127,7 +5139,18 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
       const maxPitch = Math.max(marquee.startPitch, marquee.currentPitch);
 
       const insideIds = notes
-        .filter(n => n.start_beat >= minBeat && n.start_beat <= maxBeat && n.pitch >= minPitch && n.pitch <= maxPitch)
+        .filter(n => {
+          const withinPitch = n.pitch >= minPitch && n.pitch <= maxPitch;
+          if (!withinPitch) return false;
+          const noteEnd = n.start_beat + n.duration_beats;
+          if (marquee.startBeat <= marquee.currentBeat) {
+            // Left to right: select if any overlap
+            return n.start_beat <= maxBeat && noteEnd >= minBeat;
+          } else {
+            // Right to left: select only if fully covered
+            return n.start_beat >= minBeat && noteEnd <= maxBeat;
+          }
+        })
         .map(n => n.id);
 
       setSelectedNoteIds(insideIds);
@@ -5252,14 +5275,17 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
       const firstNote = notes.find(n => n.id === firstOffset.id);
       if (!firstNote) return;
       const deltaBeat = getSnapBeat(beat - draggedNote.startOffsetBeat, snapVal) - firstOffset.originalStartBeat;
-      const deltaPitch = Math.round(pitch - draggedNote.startOffsetPitch) - firstOffset.originalPitch;
+      // Clamp so no note goes past beat 0
+      const minOrigStart = Math.min(...draggedNote.selectedNotesOffset.map(o => o.originalStartBeat));
+      const clampedDeltaBeat = minOrigStart + deltaBeat < 0 ? -minOrigStart : deltaBeat;
+      const deltaPitch = Math.round(pitch - draggedNote.startOffsetPitch);
 
       setNotes(prev => prev.map(n => {
         const offset = draggedNote.selectedNotesOffset.find(o => o.id === n.id);
         if (!offset) return n;
         return {
           ...n,
-          start_beat: getSnapBeat(Math.max(0, offset.originalStartBeat + deltaBeat), snapVal),
+          start_beat: getSnapBeat(Math.max(0, offset.originalStartBeat + clampedDeltaBeat), snapVal),
           pitch: Math.max(0, Math.min(127, offset.originalPitch + deltaPitch))
         };
       }));
@@ -10836,7 +10862,8 @@ const App = () => {
           const secondsPerBar = (60.0 / (parseInt(bpm) || 120)) * 4;
           const marginBar = maxDurationRef.current - secondsPerBar;
           const clampedTime = Math.min(time, marginBar);
-          const newDuration = Math.max(0.1, clampedTime - resize.originalStart);
+          const snappedDuration = snapValueRef.current !== 'free' ? snapTime(clampedTime - resize.originalStart, snapValueRef.current, bpm) : clampedTime - resize.originalStart;
+          const newDuration = Math.max(0.1, snappedDuration);
           items[idx] = { ...item, duration: newDuration };
         }
         return resize.itemType === 'section'