fix: xterm.js mobile touch scrolling via viewport CSS and stopPropagation

- Add full mobile viewport CSS: overflow-y scroll, -webkit-overflow-scrolling
  touch, overscroll-behavior-y contain, translate3d hardware accel,
  scroll-behavior smooth, touch-action pan-y
- After term.open(), find .xterm-viewport and add passive touch listeners
  that call stopPropagation() (not preventDefault) — this lets the browser
  handle native touch scrolling while preventing xterm.js internal handlers
  from interfering
- Based on xterm.js known issue #5489 and SCROLLING_FIX.md approach

apps/web/src/styles.css

@@ -3716,6 +3716,11 @@ a.nav-item,
 /* Mobile: allow native vertical touch panning on xterm viewport */
 .terminal-wrapper.mobile .xterm .xterm-viewport {
 	touch-action: pan-y;
+	overflow-y: scroll !important;
+	-webkit-overflow-scrolling: touch !important;
+	overscroll-behavior-y: contain;
+	transform: translate3d(0, 0, 0);
+	scroll-behavior: smooth;
 }
 
 /* Special Keys Strip */