fix: remove all touch interception, let browser scroll xterm viewport natively

- xterm.js has zero touch event handlers (verified: only 1 'touch' ref in
  entire library), so it wasn't intercepting anything
- Our touch-action: none + preventDefault() combo was blocking the browser
  from scrolling the .xterm-viewport natively
- Removed all custom touch event handlers from terminal.tsx
- Removed touch-action: none from .terminal-container
- Added touch-action: pan-y to .xterm-viewport so browser allows vertical pan
- Body scroll lock (terminal-page-open) prevents page from scrolling

apps/web/src/components/terminal.tsx

@@ -429,74 +429,7 @@ export const TerminalComponent = React.forwardRef<TerminalRef, TerminalProps>(
 			};
 			document.addEventListener("visibilitychange", handleVisibilityChange);
 
-			// Mobile touch scroll forwarding.
-			// xterm.js intercepts touch events for selection, blocking native scroll.
-			// We attach to *document* in capture phase so we run before xterm.js
-			// even on child elements. We only act when the touch target is inside
-			// this terminal container.
-			let touchStartY = 0;
-			let touchStartX = 0;
-			let isVerticalScroll = false;
-			let accumulatedDeltaY = 0;
 
-			const isInThisTerminal = (target: EventTarget | null): boolean => {
-				if (!(target instanceof Node)) return false;
-				return container.contains(target);
-			};
-
-			const handleTouchStart = (e: TouchEvent) => {
-				if (e.touches.length !== 1) return;
-				if (!isInThisTerminal(e.target)) return;
-				touchStartY = e.touches[0].clientY;
-				touchStartX = e.touches[0].clientX;
-				isVerticalScroll = false;
-				accumulatedDeltaY = 0;
-			};
-
-			const handleTouchMove = (e: TouchEvent) => {
-				if (e.touches.length !== 1 || !termRef.current) return;
-				if (!isInThisTerminal(e.target)) return;
-				const touch = e.touches[0];
-				const deltaY = touchStartY - touch.clientY;
-				const deltaX = Math.abs(touchStartX - touch.clientX);
-
-				if (!isVerticalScroll) {
-					if (Math.abs(deltaY) > deltaX && Math.abs(deltaY) > 3) {
-						isVerticalScroll = true;
-					}
-				}
-
-				if (isVerticalScroll) {
-					e.preventDefault();
-					e.stopPropagation();
-					accumulatedDeltaY += deltaY;
-					touchStartY = touch.clientY;
-					const lines = Math.round(accumulatedDeltaY / 20);
-					if (lines !== 0) {
-						termRef.current.scrollLines(-lines);
-						accumulatedDeltaY = 0;
-					}
-				}
-			};
-
-			const handleTouchEnd = () => {
-				isVerticalScroll = false;
-				accumulatedDeltaY = 0;
-			};
-
-			if (isMobile) {
-				document.addEventListener("touchstart", handleTouchStart, {
-					passive: true,
-					capture: true,
-				});
-				document.addEventListener("touchmove", handleTouchMove, {
-					passive: false,
-					capture: true,
-				});
-				document.addEventListener("touchend", handleTouchEnd, {
-					capture: true,
-				});
-			}
 
 			return () => {
 				isUnmountingRef.current = true;
@@ -509,17 +442,6 @@ export const TerminalComponent = React.forwardRef<TerminalRef, TerminalProps>(
 					"visibilitychange",
 					handleVisibilityChange,
 				);
-				if (isMobile) {
-					document.removeEventListener("touchstart", handleTouchStart, {
-						capture: true,
-					});
-					document.removeEventListener("touchmove", handleTouchMove, {
-						capture: true,
-					});
-					document.removeEventListener("touchend", handleTouchEnd, {
-						capture: true,
-					});
-				}
 				if (ws) {
 					ws.close(1000, "Component unmounting");
 				}

apps/web/src/styles.css

@@ -3707,13 +3707,17 @@ a.nav-item,
 	padding: 0;
 	overflow: hidden;
 	position: relative;
-	touch-action: none;
 }
 
 /* xterm.js manages its own sizing */
 
 /* xterm.js manages its own scrolling and viewport dimensions */
 
+/* Mobile: allow native vertical touch panning on xterm viewport */
+.terminal-wrapper.mobile .xterm .xterm-viewport {
+	touch-action: pan-y;
+}
+
 /* Special Keys Strip */
 .special-keys-strip {
 	flex-shrink: 0;