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

frontend/src/lib/i18n/en.json

@@ -26,7 +26,14 @@
 		"telegram": "Telegram",
 		"email": "Email",
 		"matrix": "Matrix",
-		"common": "Common"
+		"common": "Common",
+		"targetTelegram": "Telegram",
+		"targetWebhook": "Webhook",
+		"targetEmail": "Email",
+		"targetDiscord": "Discord",
+		"targetSlack": "Slack",
+		"targetNtfy": "ntfy",
+		"targetMatrix": "Matrix"
 	},
 	"auth": {
 		"signIn": "Sign in",
@@ -188,7 +195,14 @@
 	},
 	"targets": {
 		"title": "Targets",
-		"description": "Notification destinations (Telegram, Discord, Slack, Email, ntfy, Matrix, Webhooks)",
+		"description": "Notification delivery destinations",
+		"descTelegram": "Telegram chat destinations for notifications",
+		"descWebhook": "HTTP webhook endpoints for notification delivery",
+		"descEmail": "Email recipients for notifications",
+		"descDiscord": "Discord channel webhooks for notifications",
+		"descSlack": "Slack channel webhooks for notifications",
+		"descNtfy": "ntfy push notification topics",
+		"descMatrix": "Matrix room destinations for notifications",
 		"addTarget": "Add Target",
 		"cancel": "Cancel",
 		"type": "Type",