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/api/dashboard.py

@@ -2,7 +2,7 @@ from datetime import date, timedelta
 
 from fastapi import Depends
 from fastapi import APIRouter
-from sqlalchemy import desc, select
+from sqlalchemy import desc, or_, select
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import selectinload
 
@@ -92,15 +92,15 @@ async def get_dashboard(
                 feed_bills.append(bill)
                 seen_ids.add(bill.bill_id)
 
-    # 3. Bills matching followed topics
-    for topic in followed_topics:
+    # 3. Bills matching followed topics (single query with OR across all topics)
+    if followed_topics:
         result = await db.execute(
             select(Bill)
             .options(selectinload(Bill.sponsor), selectinload(Bill.briefs), selectinload(Bill.trend_scores))
             .join(BillBrief, Bill.bill_id == BillBrief.bill_id)
-            .where(BillBrief.topic_tags.contains([topic]))
+            .where(or_(*[BillBrief.topic_tags.contains([t]) for t in followed_topics]))
             .order_by(desc(Bill.latest_action_date))
-            .limit(10)
+            .limit(20)
         )
         for bill in result.scalars().all():
             if bill.bill_id not in seen_ids: