Fix media list duplicates and cache browse link

- Database: Use DISTINCT ON to deduplicate items by content_hash
- Database: Count unique content_hashes in count_user_items
- Server: Fix media card link from /ui/cache to /cache
- Server: Use /raw endpoint for image thumbnails
- Server: Add seen_hashes dedup in media list iteration

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

server.py

@@ -2395,11 +2395,17 @@ async def list_media(
 
         # Get cache items that belong to the user (from cache_manager)
         cache_items = []
+        seen_hashes = set()  # Deduplicate by content_hash
         for cached_file in cache_manager.list_all():
             content_hash = cached_file.content_hash
             if content_hash not in user_hashes:
                 continue
 
+            # Skip duplicates (same content from multiple runs)
+            if content_hash in seen_hashes:
+                continue
+            seen_hashes.add(content_hash)
+
             # Skip recipes - they have their own section
             if cached_file.node_type == "recipe":
                 continue
@@ -3812,11 +3818,17 @@ async def ui_media_list(
 
     # Get cache items that belong to the user (from cache_manager)
     cache_items = []
+    seen_hashes = set()  # Deduplicate by content_hash
     for cached_file in cache_manager.list_all():
         content_hash = cached_file.content_hash
         if content_hash not in user_hashes:
             continue
 
+        # Skip duplicates (same content from multiple runs)
+        if content_hash in seen_hashes:
+            continue
+        seen_hashes.add(content_hash)
+
         # Skip recipes - they have their own section
         if cached_file.node_type == "recipe":
             continue
@@ -3895,7 +3907,7 @@ async def ui_media_list(
             size_str = f"{size} bytes"
 
         html_parts.append(f'''
-        <a href="/ui/cache/{content_hash}" class="block">
+        <a href="/cache/{content_hash}" class="block">
         <div class="bg-dark-700 rounded-lg p-4 hover:bg-dark-600 transition-colors">
             <div class="flex items-center justify-between gap-2 mb-3">
                 <div class="flex items-center gap-2">
@@ -3913,7 +3925,7 @@ async def ui_media_list(
             video_src = video_src_for_request(content_hash, request)
             html_parts.append(f'<video src="{video_src}" controls muted loop playsinline class="max-h-32 rounded"></video>')
         elif media_type == "image":
-            html_parts.append(f'<img src="/cache/{content_hash}" alt="{content_hash[:16]}" class="max-h-32 rounded object-contain">')
+            html_parts.append(f'<img src="/cache/{content_hash}/raw" alt="{content_hash[:16]}" class="max-h-32 rounded object-contain">')
         else:
             html_parts.append('<p class="text-gray-400 text-sm py-4">Unknown file type</p>')