Remove edge resistance when sidebar swipe is enabled

Makes swiping to open sidebar feel natural without resistance

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/components/SwipeTabs.tsx

@@ -295,7 +295,9 @@ export function SwipeTabs<T extends string | number>({
             let offset = dx;
             const atStart = state.startIndex <= 0;
             const atEnd = state.startIndex >= tabs.length - 1;
-            if ((atStart && dx > 0) || (atEnd && dx < 0)) {
+            // Don't apply resistance at start if onSwipePastStart is defined (sidebar can open)
+            const hasVirtualTabAtStart = !!onSwipePastStart;
+            if ((atStart && dx > 0 && !hasVirtualTabAtStart) || (atEnd && dx < 0)) {
                 offset = dx * EDGE_RESISTANCE;
             }
             offset = Math.max(Math.min(offset, width), -width);
@@ -306,7 +308,7 @@ export function SwipeTabs<T extends string | number>({
                 preventDefault();
             }
         },
-        [scheduleDragUpdate, tabs.length]
+        [onSwipePastStart, scheduleDragUpdate, tabs.length]
     );
 
     const finishDrag = useCallback(