fix: avoid iOS edge lane for in-page swipes

Author: thymikee

src/__tests__/runtime-interactions.test.ts

@@ -619,6 +619,26 @@ test('runtime gesture swipe presets use stable viewport lanes', async () => {
   ]);
 });
 
+test('runtime iOS in-page swipe presets avoid edge-navigation lanes', async () => {
+  const calls: unknown[] = [];
+  const device = createInteractionDevice(snapshotWithOffscreenContent(), {
+    platform: 'ios',
+    swipe: async (_context, from, to, options) => {
+      calls.push({ from, to, durationMs: options?.durationMs });
+    },
+  });
+
+  const pageSwipe = await device.interactions.swipe({
+    preset: 'right',
+    durationMs: 300,
+    session: 'default',
+  });
+
+  assert.deepEqual(pageSwipe.from, { x: 20, y: 50 });
+  assert.deepEqual(pageSwipe.to, { x: 80, y: 50 });
+  assert.deepEqual(calls, [{ from: { x: 20, y: 50 }, to: { x: 80, y: 50 }, durationMs: 300 }]);
+});
+
 test('runtime viewport gestures reject inspect-only macOS surfaces', async () => {
   for (const surface of ['desktop', 'menubar'] as const) {
     const device = createInteractionDevice(selectorSnapshot(), {

src/core/scroll-gesture.ts

@@ -110,11 +110,13 @@ export function buildSwipePresetGesturePlan(
 ): SwipePresetGesturePlan {
   const marginPx = options.marginPx ?? 8;
   const horizontalLanePercent = options.platform === 'android' ? 65 : 50;
+  const inPageStartPercent = options.platform === 'ios' ? 80 : 90;
+  const inPageEndPercent = options.platform === 'ios' ? 20 : 10;
   const [startPercent, endPercent, yPercent] =
     preset === 'left'
-      ? [90, 10, horizontalLanePercent]
+      ? [inPageStartPercent, inPageEndPercent, horizontalLanePercent]
       : preset === 'right'
-        ? [10, 90, horizontalLanePercent]
+        ? [inPageEndPercent, inPageStartPercent, horizontalLanePercent]
         : preset === 'left-edge'
           ? [99, 15, 50]
           : [1, 85, 50];