feat: mobile swipe triage UI + tag visualization

- HammerJS swipe cards (right=journal, left=skip, up=story) with tilt/color feedback
- Three tap buttons as swipe alternative (J/S/X)
- Undo stack (max 10) with Back button
- Progress bar + header counter sync
- Thumbnail strip (all photos, colored dots, tap to jump)
- Desktop: J/S/X badges on all tagged photos including skip

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

services/travel-memories/app/templates/phase2.html

@@ -47,11 +47,12 @@
           <div class="absolute bottom-0 left-0 right-0 text-[10px] text-white bg-black/40 px-1">
             {{ photo.local_datetime[11:16] }}
           </div>
-          {% if photo.tag != 'untagged' and photo.tag != 'skip' %}
-          <div class="absolute top-1 right-1 badge badge-xs
-                      {% if photo.tag == 'journal' %}badge-success{% else %}badge-info{% endif %}">
-            {{ photo.tag[0] | upper }}
-          </div>
+          {% if photo.tag == 'journal' %}
+          <div class="absolute top-1 right-1 badge badge-xs badge-success">J</div>
+          {% elif photo.tag == 'story' %}
+          <div class="absolute top-1 right-1 badge badge-xs badge-info">S</div>
+          {% elif photo.tag == 'skip' %}
+          <div class="absolute top-1 right-1 badge badge-xs badge-ghost opacity-60">X</div>
           {% endif %}
         </div>
         {% endfor %}
@@ -100,6 +101,11 @@
               class="btn btn-circle btn-lg btn-ghost border-2 border-info text-2xl"
               onclick="mobileApp && mobileApp.doTag('story')">S</button>
     </div>
+
+    {# Thumbnail strip — all photos, colored dot per tag, tap to jump #}
+    <div id="m-thumb-strip"
+         class="mt-3 flex gap-1.5 overflow-x-auto pb-2"
+         style="scrollbar-width:thin;-webkit-overflow-scrolling:touch"></div>
   </div>
 
 </div>
@@ -274,6 +280,7 @@ function mobileTriageApp(albumId, photos) {
     if (queue.length === 0) {
       showCompletion();
       updateProgress();
+      updateThumbStrip();
       return;
     }
 
@@ -382,6 +389,7 @@ function mobileTriageApp(albumId, photos) {
 
     updateProgress();
     showCard();
+    updateThumbStrip();
   }
 
   // ── Undo ─────────────────────────────────────────────────────────────
@@ -406,10 +414,90 @@ function mobileTriageApp(albumId, photos) {
 
     updateProgress();
     showCard();
+    updateThumbStrip();
+  }
+
+  // ── Thumbnail strip ──────────────────────────────────────────────────
+
+  const thumbStrip = document.getElementById('m-thumb-strip');
+
+  function buildThumbStrip() {
+    thumbStrip.innerHTML = '';
+    photos.forEach(photo => {
+      const wrap = document.createElement('div');
+      wrap.className = 'relative flex-none cursor-pointer';
+      wrap.style.cssText = 'width:44px;height:44px;';
+      wrap.dataset.thumbId = photo.id;
+      wrap.addEventListener('click', () => jumpToPhoto(photo));
+
+      const img = document.createElement('img');
+      img.src = `/proxy/thumb/${photo.id}`;
+      img.style.cssText = 'width:100%;height:100%;object-fit:cover;border-radius:4px;border:2px solid transparent;transition:border-color 0.15s;display:block;';
+      img.draggable = false;
+      wrap.appendChild(img);
+
+      const dot = document.createElement('div');
+      dot.style.cssText = 'position:absolute;bottom:2px;left:2px;width:7px;height:7px;border-radius:50%;display:none;border:1px solid rgba(0,0,0,0.3);';
+      wrap.appendChild(dot);
+
+      thumbStrip.appendChild(wrap);
+    });
+    updateThumbStrip();
+  }
+
+  function updateThumbStrip() {
+    const currentId = queue.length > 0 ? queue[0].id : null;
+    photos.forEach(photo => {
+      const wrap = thumbStrip.querySelector(`[data-thumb-id="${photo.id}"]`);
+      if (!wrap) return;
+      const img = wrap.querySelector('img');
+      const dot = wrap.querySelector('div');
+
+      img.style.borderColor = photo.id === currentId ? '#fff' : 'transparent';
+      img.style.boxShadow = photo.id === currentId ? '0 0 0 1px rgba(0,0,0,0.4)' : 'none';
+
+      if (photo.tag === 'journal') {
+        dot.style.display = '';
+        dot.style.background = '#4ade80';
+      } else if (photo.tag === 'story') {
+        dot.style.display = '';
+        dot.style.background = '#38bdf8';
+      } else if (photo.tag === 'skip') {
+        dot.style.display = '';
+        dot.style.background = '#64748b';
+      } else {
+        dot.style.display = 'none';
+      }
+    });
+
+    if (currentId) {
+      const currentWrap = thumbStrip.querySelector(`[data-thumb-id="${currentId}"]`);
+      if (currentWrap) currentWrap.scrollIntoView({ behavior: 'smooth', inline: 'center', block: 'nearest' });
+    }
+  }
+
+  async function jumpToPhoto(photo) {
+    const queueIdx = queue.findIndex(p => p.id === photo.id);
+    if (queueIdx !== -1) queue.splice(queueIdx, 1);
+
+    if (photo.tag !== 'untagged') taggedCount--;
+    const prevTag = photo.tag;
+    photo.tag = 'untagged';
+    queue.unshift(photo);
+
+    await fetch('/triage/tag', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ album_id: albumId, asset_id: photo.id, tag: 'untagged' }),
+    });
+
+    updateProgress();
+    updateThumbStrip();
+    showCard();
   }
 
   // ── Public API ───────────────────────────────────────────────────────
-  return { doTag, undo, showCard };
+  return { doTag, undo, showCard, buildThumbStrip, updateThumbStrip };
 }
 
 // ── View switching on load ───────────────────────────────────────────────────
@@ -427,6 +515,7 @@ document.addEventListener('DOMContentLoaded', () => {
     document.getElementById('m-progress-text').textContent = `${taggedCount} / ${photos.length} tagged`;
     document.getElementById('m-progress-bar').style.width =
       photos.length > 0 ? `${(taggedCount / photos.length) * 100}%` : '0%';
+    mobileApp.buildThumbStrip();
     mobileApp.showCard();
   }
   // Desktop: nothing extra needed — Alpine handles it