Complete 3.3.2: Touch Interaction Optimization

- Verified 44px minimum touch targets already in place
- Added swipe gesture support for mobile chat toggling
- Implemented pull-to-refresh functionality for mobile
- Added double-tap gesture for fullscreen toggle on video area
- All touch interactions are mobile-only to avoid desktop conflicts

UI_UPDATE.MD

@@ -346,9 +346,11 @@ Always come back and update UI_UPDATE.MD once complete with task and task item.
 **Notes:** Implemented comprehensive mobile-first responsive design. Updated layout.css to use BEM class names, added vertical stacking layout for mobile (flex-direction: column), chat slides up from bottom as modal overlay on mobile instead of collapsing to the side. Enhanced touch-friendly navigation with 44px minimum touch targets already in place. Updated ui-controls.js to handle mobile chat overlay behavior. Desktop remains side-by-side layout while mobile prioritizes video content with chat on-demand.
 
 #### 3.3.2: Touch Interaction Optimization
-- [ ] Ensure 44px minimum touch targets
-- [ ] Implement swipe gesture support
-- [ ] Add mobile-specific interactive elements
+- [x] Ensure 44px minimum touch targets
+- [x] Implement swipe gesture support
+- [x] Add mobile-specific interactive elements
+
+**Notes:** Implemented comprehensive touch interaction enhancements for mobile devices. The 44px minimum touch targets were already in place using var(--min-tap-target-size, 44px) in components.css. Added swipe gesture support on video area for chat toggling (swipe left to hide, right to show chat on mobile). Implemented pull-to-refresh functionality that triggers refresh when pulling down from top of page on mobile. Added double-tap gesture on video area to toggle fullscreen. All touch interactions are mobile-only to avoid conflicts on desktop.
 
 #### 3.3.3: Mobile Navigation
 - [ ] Create bottom navigation pattern

assets/js/ui-controls.js

@@ -195,6 +195,163 @@
         }
     }
 
+    // Touch gesture handling for mobile interactions
+    let touchStartX = 0;
+    let touchStartY = 0;
+    let touchStartTime = 0;
+    let isSwipeGesture = false;
+
+    function handleTouchStart(event) {
+        touchStartX = event.touches[0].clientX;
+        touchStartY = event.touches[0].clientY;
+        touchStartTime = Date.now();
+        isSwipeGesture = false;
+    }
+
+    function handleTouchMove(event) {
+        if (!event.touches || event.touches.length === 0) return;
+
+        const touchCurrentX = event.touches[0].clientX;
+        const touchCurrentY = event.touches[0].clientY;
+        const deltaX = touchCurrentX - touchStartX;
+        const deltaY = touchCurrentY - touchStartY;
+
+        // Determine if this is a horizontal swipe (more horizontal than vertical movement)
+        if (Math.abs(deltaX) > Math.abs(deltaY) && Math.abs(deltaX) > 50) {
+            isSwipeGesture = true;
+        }
+    }
+
+    function handleTouchEnd(event) {
+        if (!touchStartTime) return;
+
+        const touchEndTime = Date.now();
+        const touchDuration = touchEndTime - touchStartTime;
+
+        if (touchDuration < 1000 && isSwipeGesture) { // Swipe gesture within 1 second
+            const touchEndX = event.changedTouches[0].clientX;
+            const deltaX = touchEndX - touchStartX;
+            const minSwipeDistance = 75; // Minimum swipe distance in pixels
+
+            if (Math.abs(deltaX) > minSwipeDistance) {
+                const isMobile = window.innerWidth <= AppConfig.ui.mobileBreakpoint;
+
+                if (isMobile) {
+                    // On mobile, swipe left to hide chat, right to show chat
+                    if (deltaX < 0) {
+                        // Swipe left - hide chat
+                        if (!AppState.chatCollapsed) {
+                            toggleChat();
+                        }
+                    } else {
+                        // Swipe right - show chat
+                        if (AppState.chatCollapsed) {
+                            toggleChat();
+                        }
+                    }
+                }
+            }
+        }
+
+        // Reset touch tracking
+        touchStartX = 0;
+        touchStartY = 0;
+        touchStartTime = 0;
+        isSwipeGesture = false;
+    }
+
+    // Pull-to-refresh functionality for mobile
+    let pullStartY = 0;
+    let pullDistance = 0;
+    let isPulling = false;
+    const pullThreshold = 80; // Minimum pull distance to trigger refresh
+
+    function handlePullToRefreshTouchStart(event) {
+        if (window.innerWidth > AppConfig.ui.mobileBreakpoint) return; // Only on mobile
+
+        pullStartY = event.touches[0].clientY;
+        pullDistance = 0;
+        isPulling = true;
+    }
+
+    function handlePullToRefreshTouchMove(event) {
+        if (!isPulling || window.innerWidth > AppConfig.ui.mobileBreakpoint) return;
+
+        const currentY = event.touches[0].clientY;
+        pullDistance = currentY - pullStartY;
+
+        // Only allow pull down from top of page
+        if (window.scrollY === 0 && pullDistance > 0) {
+            event.preventDefault(); // Prevent default scrolling behavior
+
+            const pullIndicator = document.getElementById('pullRefreshIndicator');
+            if (pullIndicator) {
+                const opacity = Math.min(pullDistance / pullThreshold, 1);
+                pullIndicator.style.opacity = opacity;
+                pullIndicator.style.transform = `translateY(${Math.min(pullDistance * 0.5, 40)}px)`;
+            }
+        } else {
+            pullDistance = 0;
+        }
+    }
+
+    function handlePullToRefreshTouchEnd() {
+        if (!isPulling) return;
+
+        isPulling = false;
+
+        if (pullDistance > pullThreshold && window.scrollY === 0) {
+            // Trigger refresh
+            performPullToRefresh();
+        }
+
+        // Reset pull indicator
+        const pullIndicator = document.getElementById('pullRefreshIndicator');
+        if (pullIndicator) {
+            pullIndicator.style.opacity = '0';
+            pullIndicator.style.transform = 'translateY(0px)';
+        }
+
+        pullStartY = 0;
+        pullDistance = 0;
+    }
+
+    function performPullToRefresh() {
+        showToast('Refreshing...', 0); // Show loading message
+
+        // Trigger the refresh by reloading data
+        if (window.ChatSystem && typeof window.ChatSystem.refresh === 'function') {
+            window.ChatSystem.refresh().then(() => {
+                showToast('Content refreshed', 2000);
+            }).catch(() => {
+                showToast('Refresh failed', 2000);
+            });
+        } else {
+            // Fallback: refresh the page after a short delay
+            setTimeout(() => {
+                window.location.reload();
+            }, 500);
+        }
+    }
+
+    // Double-tap handler for video area (fullscreen toggle)
+    let lastTapTime = 0;
+    const doubleTapDelay = 300; // milliseconds
+
+    function handleVideoDoubleTap(event) {
+        const currentTime = Date.now();
+        const timeSinceLastTap = currentTime - lastTapTime;
+
+        if (timeSinceLastTap < doubleTapDelay && timeSinceLastTap > 0) {
+            // Double tap detected - toggle fullscreen
+            event.preventDefault();
+            toggleFullscreen();
+            lastTapTime = 0;
+        } else {
+            lastTapTime = currentTime;
+        }
+    }
+
     // Page visibility API handler
     function handleVisibilityChange() {
         if (!document.hidden && !AppState.chatCollapsed) {
@@ -268,6 +425,23 @@
         // Page visibility for notification clearing
         DOMUtils.addEvent(document, 'visibilitychange', handleVisibilityChange);
 
+        // Touch gesture support for mobile
+        const videoSection = document.getElementById('videoSection');
+        if (videoSection) {
+            // Swipe gestures on video area for chat toggle
+            DOMUtils.addEvent(videoSection, 'touchstart', handleTouchStart, { passive: true });
+            DOMUtils.addEvent(videoSection, 'touchmove', handleTouchMove, { passive: true });
+            DOMUtils.addEvent(videoSection, 'touchend', handleTouchEnd, { passive: true });
+
+            // Double-tap on video for fullscreen
+            DOMUtils.addEvent(videoSection, 'touchend', handleVideoDoubleTap);
+        }
+
+        // Pull-to-refresh on the whole document (only on mobile)
+        DOMUtils.addEvent(document, 'touchstart', handlePullToRefreshTouchStart, { passive: true });
+        DOMUtils.addEvent(document, 'touchmove', handlePullToRefreshTouchMove, { passive: false });
+        DOMUtils.addEvent(document, 'touchend', handlePullToRefreshTouchEnd, { passive: true });
+
         AppLogger.log('UI controls event listeners initialized');
     }