Add swipe gestures, source links, and scalable dots to car mode

- Add touch swipe support for navigating between news cards
- Remove prev/next arrow buttons (replaced by swipe)
- Add source article link buttons below each card
- Scale card counter dots to fit within viewport width

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

news-app/src/main.js

@@ -256,10 +256,18 @@ function renderCarModeCard(group, index, total) {
         <div class="car-mode-progress h-full bg-yellow-400"></div>
       </div>
     </div>
+    <!-- Source article links -->
+    <div class="flex items-center justify-center gap-2 sm:gap-3 mt-3 mb-2 z-20">
+      ${group.articles.slice(0, 5).map((article, i) => `
+        <a href="${article.link}" target="_blank" rel="noopener noreferrer" class="px-3 py-1.5 sm:px-4 sm:py-2 text-sm sm:text-base font-medium text-white/80 hover:text-white bg-white/10 hover:bg-white/20 rounded-full transition-colors backdrop-blur-sm" title="${article.title} (${article.source})">
+          Link ${i + 1}
+        </a>
+      `).join('')}
+    </div>
     <!-- Card counter -->
-    <div class="absolute bottom-6 sm:bottom-8 left-1/2 -translate-x-1/2 flex items-center gap-2 z-30">
+    <div class="absolute bottom-6 sm:bottom-8 left-1/2 -translate-x-1/2 flex items-center justify-center z-30 max-w-[90vw] px-4">
       ${Array.from({ length: total }, (_, i) => `
-        <div class="w-2 h-2 rounded-full transition-all duration-300 ${i === index ? 'bg-white w-6' : 'bg-white/40'}"></div>
+        <div class="shrink-0 rounded-full transition-all duration-300 ${i === index ? 'bg-white' : 'bg-white/40'}" style="width: ${i === index ? Math.max(12, Math.min(24, 200 / total)) : Math.max(6, Math.min(8, 120 / total))}px; height: ${Math.max(6, Math.min(8, 120 / total))}px; margin: 0 ${Math.max(2, Math.min(4, 60 / total))}px;"></div>
       `).join('')}
     </div>
   `
@@ -321,20 +329,6 @@ function renderCarMode() {
       <!-- Card Container -->
       <div class="relative z-10 flex flex-col items-center w-full h-full pt-16">
         ${renderCarModeCard(currentGroup, state.carModeIndex, state.groups.length)}
-        
-        <!-- Navigation buttons moved below card -->
-        <div class="flex items-center gap-12 mt-4 sm:mt-6 z-20">
-          <button onclick="carModePrev()" class="p-4 text-white/70 hover:text-white hover:bg-white/10 rounded-full transition-colors backdrop-blur-sm bg-black/10" title="Previous">
-            <svg class="w-8 h-8 sm:w-10 sm:h-10" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7"></path>
-            </svg>
-          </button>
-          <button onclick="carModeNext()" class="p-4 text-white/70 hover:text-white hover:bg-white/10 rounded-full transition-colors backdrop-blur-sm bg-black/10" title="Next">
-            <svg class="w-8 h-8 sm:w-10 sm:h-10" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"></path>
-            </svg>
-          </button>
-        </div>
       </div>
     </div>
   `
@@ -721,6 +715,42 @@ document.addEventListener('keydown', (e) => {
   }
 })
 
+// Touch/swipe support for car mode
+let touchStartX = 0
+let touchStartY = 0
+let touchEndX = 0
+let touchEndY = 0
+
+document.addEventListener('touchstart', (e) => {
+  if (!state.carMode) return
+  touchStartX = e.changedTouches[0].screenX
+  touchStartY = e.changedTouches[0].screenY
+}, { passive: true })
+
+document.addEventListener('touchend', (e) => {
+  if (!state.carMode) return
+  touchEndX = e.changedTouches[0].screenX
+  touchEndY = e.changedTouches[0].screenY
+  handleSwipe()
+}, { passive: true })
+
+function handleSwipe() {
+  const deltaX = touchEndX - touchStartX
+  const deltaY = touchEndY - touchStartY
+  const minSwipeDistance = 50
+
+  // Only register as horizontal swipe if horizontal movement is greater than vertical
+  if (Math.abs(deltaX) > Math.abs(deltaY) && Math.abs(deltaX) > minSwipeDistance) {
+    if (deltaX < 0) {
+      // Swiped left - go to next card
+      window.carModeNext()
+    } else {
+      // Swiped right - go to previous card
+      window.carModePrev()
+    }
+  }
+}
+
 // Initialize: either start car mode or fetch regular news
 if (isCarModeUrl) {
   // On dedicated car mode URL, directly enter car mode