feat: UX & notification improvements — icons, events, chat names, link validation, templates

- Show entity icons on all cards with fallback defaults (providers, trackers, targets, bots)
- Enrich EventLog with provider_name, tracker_name, assets_count; add DB migration
- Dashboard events: filtering (type, provider, search), sorting, pagination, dynamic page size
- Friendly chat names on telegram target cards (resolve from TelegramChat table)
- Test message button on bot chat items with locale-aware messages
- Album public link validation on tracker save with auto-create dialog
- Support albums without public links: conditional <a href> in templates
- Fetch shared links during poll, enrich events with public_url/protected_url
- Per-asset public_url in template context ({share_url}/photos/{asset_id})
- Common date/location detection: common_date + common_location context vars
- Dual date formats: date_format (datetime) + date_only_format (date only)
- Template clone button, HTML link rendering in template preview
- Fix Telegram asset download 401: pass x-api-key headers through client
- Fix provider external_url matching for API key scoping
- Fix event timestamp timezone (append Z suffix for UTC)
- Localize event filter controls, test messages (EN/RU)
- Template variable UI helpers updated with all new fields
- CLAUDE.md: template system sync rules documentation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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

@@ -2,7 +2,7 @@
 
 from typing import Any
 
-from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi import APIRouter, Depends, HTTPException, Query, status
 from pydantic import BaseModel
 from sqlmodel import select
 from sqlmodel.ext.asyncio.session import AsyncSession
@@ -152,6 +152,7 @@ async def delete_tracker_target(
 async def test_tracker_target(
     tracker_id: int,
     tracker_target_id: int,
+    locale: str = Query("en"),
     user: User = Depends(get_current_user),
     session: AsyncSession = Depends(get_session),
 ):
@@ -166,7 +167,7 @@ async def test_tracker_target(
         raise HTTPException(status_code=404, detail="Target not found")
 
     from ..services.notifier import send_test_notification
-    r = await send_test_notification(target)
+    r = await send_test_notification(target, locale=locale)
     return {"target": target.name, **r}