fix(ui): square mobile file tiles, files scroll clearance, apps-tab swipe guard

- Apps tab: a horizontal swipe that starts on an app icon no longer flips the
  top tab — it lets the app-page scroll / icon tap win (swipe empty space to
  change tab). Fixes the swipe conflict with two pages of apps.
- Files: file cover tiles are forced square on mobile (aspect driven by CSS,
  not a Tailwind arbitrary class) so the grid is uniform and tappable.
- Files: scroll container gets bottom safe-area + tab-bar padding so the last
  row clears the mobile back button / bottom nav.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

neode-ui/src/views/Dashboard.vue

@@ -290,14 +290,19 @@ function activeNetKey(): string {
 let touchStartX = 0
 let touchStartY = 0
 let touchStartTime = 0
+let swipeSuppressed = false
 function onContentTouchStart(e: TouchEvent) {
   const t = e.touches[0]
   if (!t) return
+  // Don't begin a tab swipe when the gesture starts on an app icon — let the
+  // icon handle the tap/long-press. Swiping anywhere else still changes tabs.
+  swipeSuppressed = !!(e.target instanceof Element && e.target.closest('.app-icon-item'))
   touchStartX = t.clientX
   touchStartY = t.clientY
   touchStartTime = e.timeStamp
 }
 function onContentTouchEnd(e: TouchEvent) {
+  if (swipeSuppressed) { swipeSuppressed = false; return }
   const t = e.changedTouches[0]
   if (!t) return
   const dx = t.clientX - touchStartX