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/components/terminal.tsx

@@ -430,32 +430,36 @@ export const TerminalComponent = React.forwardRef<TerminalRef, TerminalProps>(
 			document.addEventListener("visibilitychange", handleVisibilityChange);
 
 			// Mobile touch scroll forwarding.
-			// xterm.js intercepts touch events for selection, which blocks the
-			// browser from scrolling the viewport. We listen on the container in
-			// capture phase, decide early if the gesture is vertical, and then
-			// preventDefault + stopPropagation so xterm.js never sees the event.
-			// The scroll is forwarded to term.scrollLines().
+			// 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) {
-					touchStartY = e.touches[0].clientY;
-					touchStartX = e.touches[0].clientX;
-					isVerticalScroll = false;
-					accumulatedDeltaY = 0;
-				}
+				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);
 
-				// Decide scroll direction on the first meaningful movement (3px)
 				if (!isVerticalScroll) {
 					if (Math.abs(deltaY) > deltaX && Math.abs(deltaY) > 3) {
 						isVerticalScroll = true;
@@ -463,16 +467,12 @@ export const TerminalComponent = React.forwardRef<TerminalRef, TerminalProps>(
 				}
 
 				if (isVerticalScroll) {
-					// preventDefault MUST be called on the first matching touchmove
-					// or the browser compositor will already have committed to page
-					// scroll before our JS runs.
 					e.preventDefault();
 					e.stopPropagation();
 					accumulatedDeltaY += deltaY;
 					touchStartY = touch.clientY;
-					const lines = Math.round(accumulatedDeltaY / 24);
+					const lines = Math.round(accumulatedDeltaY / 20);
 					if (lines !== 0) {
-						// Negative = scroll up (show older buffer content)
 						termRef.current.scrollLines(-lines);
 						accumulatedDeltaY = 0;
 					}
@@ -485,15 +485,15 @@ export const TerminalComponent = React.forwardRef<TerminalRef, TerminalProps>(
 			};
 
 			if (isMobile) {
-				container.addEventListener("touchstart", handleTouchStart, {
+				document.addEventListener("touchstart", handleTouchStart, {
 					passive: true,
 					capture: true,
 				});
-				container.addEventListener("touchmove", handleTouchMove, {
+				document.addEventListener("touchmove", handleTouchMove, {
 					passive: false,
 					capture: true,
 				});
-				container.addEventListener("touchend", handleTouchEnd, {
+				document.addEventListener("touchend", handleTouchEnd, {
 					capture: true,
 				});
 			}
@@ -510,13 +510,13 @@ export const TerminalComponent = React.forwardRef<TerminalRef, TerminalProps>(
 					handleVisibilityChange,
 				);
 				if (isMobile) {
-					container.removeEventListener("touchstart", handleTouchStart, {
+					document.removeEventListener("touchstart", handleTouchStart, {
 						capture: true,
 					});
-					container.removeEventListener("touchmove", handleTouchMove, {
+					document.removeEventListener("touchmove", handleTouchMove, {
 						capture: true,
 					});
-					container.removeEventListener("touchend", handleTouchEnd, {
+					document.removeEventListener("touchend", handleTouchEnd, {
 						capture: true,
 					});
 				}

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 */