refactor(templates): _gallery_item.html KIND_EMOJI dict + display_name

Collapses the six-branch prefix-strip expression into a KIND_EMOJI
jinja dict. Anchor hrefs use ?tag_id=.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/templates/_gallery_item.html

@@ -10,27 +10,24 @@
 
   {% set visible_tags = image.tags | rejectattr('kind', 'in', ['archive', 'source']) | list %}
   {% if visible_tags %}
+    {% set KIND_EMOJI = {
+        'artist':    '🎨',
+        'character': '👤',
+        'series':    '📺',
+        'fandom':    '🎭',
+        'meta':      '⚠️',
+        'rating':    '⚠️',
+        'post':      '📌',
+        'archive':   '📦',
+        'user':      '#',
+    } %}
     <div class="tag-overlay">
       {% for t in visible_tags %}
-        <a class="tag-chip"
-           href="{{ url_for('main.gallery', tag=t.name) }}"
-           title="Filter by {{ t.name }}"
+        <a class="tag-chip tag-chip-{{ t.kind or 'user' }}"
+           href="{{ url_for('main.gallery', tag_id=t.id) }}"
+           title="Filter by {{ t.display_name }}"
            onclick="event.stopPropagation()">
-          {% if t.kind == 'artist' %}
-            🎨 {{ t.name.split(':', 1)[1] if ':' in t.name else t.name }}
-          {% elif t.kind == 'character' %}
-            👤 {{ t.name.split(':', 1)[1] if ':' in t.name else t.name }}
-          {% elif t.kind == 'series' %}
-            📺 {{ t.name.split(':', 1)[1] if ':' in t.name else t.name }}
-          {% elif t.kind == 'fandom' %}
-            🎭 {{ t.name.split(':', 1)[1] if ':' in t.name else t.name }}
-          {% elif t.kind == 'rating' %}
-            ⚠️ {{ t.name.split(':', 1)[1] if ':' in t.name else t.name }}
-          {% elif t.kind == 'post' %}
-            📌 {{ t.name.split(':', 1)[1] if ':' in t.name else t.name }}
-          {% else %}
-            #{{ t.name }}
-          {% endif %}
+          {{ KIND_EMOJI.get(t.kind, '#') }} {{ t.display_name }}
         </a>
       {% endfor %}
     </div>