Address review feedback

- e2e/drop-overlay.spec.ts: drive the resize-handle test with a real
  `click()` instead of `dispatchEvent("pointerdown")`. A synthetic pointer
  event carries no active pointer id, so `startLayerPanelResize`'s
  `setPointerCapture` could throw before the capture-phase recovery was
  exercised, and the gesture never reached `pointerup` to tear the resize
  down. Verified the test still fails when the listeners are moved back to
  the bubble phase, so it remains a real regression test.

- DesktopShell.tsx: scope the "cannot occur during a real drag" claim to
  the pointer listener only. HTML5 drag-and-drop suppresses mouse events
  and a native drag holds an OS pointer grab, but neither spec promises
  keyboard events are withheld, and the inline comment on `onKeyDown`
  already assumed a keypress can arrive mid-drag. Escape is now described
  for what it is: a conventional request to cancel the stranded overlay or
  the drag itself.

Author: giswqs

apps/geolibre-desktop/src/components/layout/DesktopShell.tsx

@@ -1823,12 +1823,11 @@ export function DesktopShell({
   // has the same effect. The result is an overlay covering the map until the
   // user happens to drag another file across the window.
   //
-  // Rather than guess at every way the OS can swallow an event, recover on two
-  // signals that cannot occur while a real drag is in progress: a key press and
-  // a pointer button. Neither fires during an HTML5 drag (the spec suppresses
-  // mouse events for the duration) nor during a native one (the OS holds a
-  // pointer grab), so this can never dismiss the overlay out from under a drag
-  // the user is actually performing.
+  // Rather than guess at every way the OS can swallow an event, recover on a
+  // pointer button, which cannot occur while a real drag is in progress: HTML
+  // drag-and-drop suppresses mouse events and a native drag holds an OS pointer
+  // grab. Escape is a separate, conventional request to cancel either the
+  // stranded overlay or a genuine drag.
   useEffect(() => {
     if (!isDraggingFiles) return;
 

e2e/drop-overlay.spec.ts

@@ -64,7 +64,7 @@ test("a press on a control that stops propagation still dismisses the overlay",
   // The panel resize handles call stopPropagation() on pointerdown, so a bubble
   // phase listener on window would never see this press. The recovery listens
   // in the capture phase precisely so it does.
-  await page.locator('[aria-label="Resize Layers panel"]').first().dispatchEvent("pointerdown");
+  await page.locator('[aria-label="Resize Layers panel"]').first().click();
   await expect(page.locator(OVERLAY)).toBeHidden();
 });