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

frontend/components/shared/FollowButton.tsx

@@ -153,7 +153,7 @@ export function FollowButton({ type, value, label, supportsModes = false }: Foll
         </button>
 
         {open && (
-          <div className="absolute right-0 mt-1 w-64 bg-popover border border-border rounded-md shadow-lg z-50 py-1">
+          <div className="absolute right-0 mt-1 w-64 bg-card border border-border rounded-md shadow-lg z-50 py-1">
             {otherModes.map((mode) => {
               const { label: optLabel, icon: OptIcon } = MODES[mode];
               return (
@@ -161,7 +161,7 @@ export function FollowButton({ type, value, label, supportsModes = false }: Foll
                   key={mode}
                   onClick={() => switchMode(mode)}
                   title={modeDescriptions[mode]}
-                  className="w-full text-left px-3 py-2 text-sm hover:bg-accent transition-colors flex flex-col gap-0.5"
+                  className="w-full text-left px-3 py-2 text-sm bg-card hover:bg-accent text-card-foreground transition-colors flex flex-col gap-0.5"
                 >
                   <span className="flex items-center gap-1.5 font-medium">
                     <OptIcon className="w-3.5 h-3.5" />
@@ -174,7 +174,7 @@ export function FollowButton({ type, value, label, supportsModes = false }: Foll
             <div className="border-t border-border mt-1 pt-1">
               <button
                 onClick={handleUnfollow}
-                className="w-full text-left px-3 py-2 text-sm text-destructive hover:bg-accent transition-colors"
+                className="w-full text-left px-3 py-2 text-sm bg-card hover:bg-accent text-destructive transition-colors"
               >
                 Unfollow
               </button>