fix: document-level capture touch listeners for mobile terminal scroll

- Attach touch listeners to document with capture:true instead of container
- Check if touch target is inside terminal container before handling
- This runs before xterm.js internal handlers, giving us full control
- Add touch-action: none to terminal container to prevent browser gestures
- Lower threshold to 3px, 20px per line for responsive scrolling

apps/web/src/styles.css

@@ -3707,6 +3707,7 @@ a.nav-item,
 	padding: 0;
 	overflow: hidden;
 	position: relative;
+	touch-action: none;
 }
 
 /* xterm.js manages its own sizing */