feat: v1.0.0 — UX polish, security hardening, code quality

UI/UX:
- Bill detail page tab UI (Analysis / Timeline / Votes / Notes)
- Topic tag pills on bill detail and listing pages — filtered to known
  topics, clickable, properly labelled via shared lib/topics.ts
- Notes panel always-open in Notes tab; sign-in prompt for guests
- Collapsible sidebar with icon-only mode and localStorage persistence
- Bills page defaults to has-text filter enabled
- Follow mode dropdown transparency fix
- Favicon (Landmark icon, blue background)

Security:
- Fernet encryption for ntfy passwords at rest (app/core/crypto.py)
- Separate ENCRYPTION_SECRET_KEY env var; falls back to JWT derivation
- ntfy_password no longer returned in GET response — replaced with
  ntfy_password_set: bool; NotificationSettingsUpdate type for writes
- JWT_SECRET_KEY fail-fast on startup if using default placeholder
- get_optional_user catches (JWTError, ValueError) only, not Exception

Bug fixes & code quality:
- Dashboard N+1 topic query replaced with single OR query
- notification_utils.py topic follower N+1 replaced with batch query
- Note query in bill detail page gated on token (enabled: !!token)
- search.py max_length=500 guard against oversized queries
- CollectionCreate.validate_name wired up with @field_validator
- LLM_RATE_LIMIT_RPM default raised from 10 to 50

Authored by: Jack Levy

backend/app/workers/notification_utils.py

@@ -129,16 +129,20 @@ def emit_topic_follow_notifications(
     from app.models.follow import Follow
     from app.models.notification import NotificationEvent
 
-    # Collect unique followers across all matching tags, recording the first matching tag per user
+    # Single query for all topic followers, then deduplicate by user_id
+    all_follows = db.query(Follow).filter(
+        Follow.follow_type == "topic",
+        Follow.follow_value.in_(topic_tags),
+    ).all()
+
     seen_user_ids: set[int] = set()
     followers = []
     follower_topic: dict[int, str] = {}
-    for tag in topic_tags:
-        for follow in db.query(Follow).filter_by(follow_type="topic", follow_value=tag).all():
-            if follow.user_id not in seen_user_ids:
-                seen_user_ids.add(follow.user_id)
-                followers.append(follow)
-                follower_topic[follow.user_id] = tag
+    for follow in all_follows:
+        if follow.user_id not in seen_user_ids:
+            seen_user_ids.add(follow.user_id)
+            followers.append(follow)
+            follower_topic[follow.user_id] = follow.follow_value
 
     if not followers:
         return 0