fix: set selectionFollowsTempo based on which ruler is clicked

- Time Ruler click → setSelectionFollowsTempo(false) → time-based
- Tempo Track Lane click → setSelectionFollowsTempo(true) → tempo-based
- Also handles sub-tab ruler (EDITOR tabs)
- Manual toggle button ♪T/⏱T still works for override

app/static/js/app.jsx

@@ -15865,7 +15865,7 @@ const App = () => {
       viewportWidth: viewportWidth,
       onPlayheadSet: handlePlayheadSet,
       snapValue: snapValue,
-      onRulerMouseDown: handleRulerMouseDown,
+      onRulerMouseDown: e => { setSelectionFollowsTempo(false); handleRulerMouseDown(e); },
       scrollLeft: scrollLeft,
       canvasRedrawCount: canvasRedrawCount
     }), /*#__PURE__*/React.createElement(TempoTrackLane, {
@@ -15875,7 +15875,7 @@ const App = () => {
       viewportWidth: viewportWidth,
       onPlayheadSet: handlePlayheadSet,
       snapValue: snapValue,
-      onRulerMouseDown: handleRulerMouseDown,
+      onRulerMouseDown: e => { setSelectionFollowsTempo(true); handleRulerMouseDown(e); },
       scrollLeft: scrollLeft,
       canvasRedrawCount: canvasRedrawCount
     })), selectionMode === 'global' && selLeft !== null && selRight !== null && selRight > selLeft && /*#__PURE__*/React.createElement("div", {
@@ -16438,6 +16438,7 @@ const App = () => {
         onPlayheadSet: setCurrentTime,
         snapValue: snapValue,
         onRulerMouseDown: e => {
+          setSelectionFollowsTempo(false);
           const wrapper = timelineWrapperRef.current;
           if (!wrapper) return;
           const rect = wrapper.getBoundingClientRect();