feat: entity cache system, nav UX improvements, split CLAUDE.md

- Add $state-based entity cache layer with 30s TTL, request deduplication,
  and local mutation helpers (entity-cache.svelte.ts + caches.svelte.ts)
- Wire all 10 page components to use shared caches for cross-page data
- Add slide animation for nav tree expand/collapse with rotating chevron
- Remove aggregate count badges from container nav nodes (keep on leaves)
- Convert Targets from flat leaf to group with per-type children
  (Telegram, Webhook, Email, Discord, Slack, ntfy, Matrix)
- Add URL-based type filtering on Targets page with per-type descriptions
- Add Bots group children for Email and Matrix alongside Telegram
- Tab-based routing for bots page (?tab=telegram/email/matrix)
- Add per-type target counts and email/matrix bot counts to /status/counts
- Split CLAUDE.md into focused context files under .claude/docs/
- Fix .gitignore: scope lib/ to root, allow .claude/docs/ tracking
- Clear all caches on logout
- Reset form state when switching target type tabs

.gitignore

@@ -10,8 +10,8 @@ dist/
 downloads/
 eggs/
 .eggs/
-lib/
-lib64/
+/lib/
+/lib64/
 parts/
 sdist/
 var/
@@ -43,7 +43,8 @@ Thumbs.db
 htmlcov/
 
 # Claude Code
-.claude/
+.claude/settings.json
+.claude/settings.local.json
 
 # Data
 test-data/