Fix renderer list and enable markdown tables

- Fix get_user_renderers usage (returns strings not dicts)
- Enable tables and fenced_code markdown extensions

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

app/routers/renderers.py

@@ -33,11 +33,13 @@ async def list_renderers(
     """List attached L1 renderers."""
     import db
 
-    renderers = await db.get_user_renderers(user["username"])
+    renderer_urls = await db.get_user_renderers(user["username"])
 
-    # Add status info
-    for r in renderers:
-        r["known"] = r["url"] in settings.l1_servers
+    # Convert to dicts with status info
+    renderers = [
+        {"url": url, "known": url in settings.l1_servers}
+        for url in renderer_urls
+    ]
 
     if wants_json(request):
         return {"renderers": renderers, "known_servers": settings.l1_servers}
@@ -67,7 +69,7 @@ async def attach_renderer(
 
     # Check if already attached
     existing = await db.get_user_renderers(user["username"])
-    if l1_url in [r["url"] for r in existing]:
+    if l1_url in existing:
         raise HTTPException(400, "Renderer already attached")
 
     # Test connection

app/routers/users.py

@@ -149,7 +149,7 @@ async def home(request: Request):
         from pathlib import Path
         readme_path = Path(__file__).parent.parent.parent / "README.md"
         if readme_path.exists():
-            readme_html = markdown.markdown(readme_path.read_text())
+            readme_html = markdown.markdown(readme_path.read_text(), extensions=['tables', 'fenced_code'])
     except Exception:
         pass