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

packages/server/src/notify_bridge_server/api/status.py

@@ -12,7 +12,9 @@ from ..database.models import (
     CommandConfig,
     CommandTemplateConfig,
     CommandTracker,
+    EmailBot,
     EventLog,
+    MatrixBot,
     NotificationTarget,
     NotificationTracker,
     ServiceProvider,
@@ -119,6 +121,8 @@ async def get_nav_counts(
         (TemplateConfig, "template_configs"),
         (NotificationTarget, "targets"),
         (TelegramBot, "telegram_bots"),
+        (EmailBot, "email_bots"),
+        (MatrixBot, "matrix_bots"),
         (CommandTracker, "command_trackers"),
         (CommandConfig, "command_configs"),
         (CommandTemplateConfig, "command_template_configs"),
@@ -138,6 +142,16 @@ async def get_nav_counts(
         )).one()
         counts[key] += system_count
 
+    # Per-type target counts for nav badges
+    for target_type in ("telegram", "webhook", "email", "discord", "slack", "ntfy", "matrix"):
+        type_count = (await session.exec(
+            select(func.count()).select_from(NotificationTarget).where(
+                NotificationTarget.user_id == user.id,
+                NotificationTarget.type == target_type,
+            )
+        )).one()
+        counts[f"targets_{target_type}"] = type_count
+
     return counts