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/services/watcher.py

@@ -174,11 +174,16 @@ async def check_tracker(tracker_id: int) -> dict[str, Any]:
                 session.add(new_ts)
 
         for event in events:
+            assets_count = event.added_count or event.removed_count or 0
             log = EventLog(
                 tracker_id=tracker_id,
+                tracker_name=tracker.name,
+                provider_id=provider.id,
+                provider_name=provider_name,
                 event_type=event.event_type.value,
                 collection_id=event.collection_id,
                 collection_name=event.collection_name,
+                assets_count=assets_count,
                 details={
                     "added_count": event.added_count,
                     "removed_count": event.removed_count,
@@ -233,8 +238,11 @@ async def check_tracker(tracker_id: int) -> dict[str, Any]:
                     type=ld["target_type"],
                     config=ld["target_config"],
                     template_slots=slots,
+                    date_format=tmpl.date_format if tmpl else "%d.%m.%Y, %H:%M UTC",
+                    date_only_format=tmpl.date_only_format if tmpl and hasattr(tmpl, "date_only_format") else "%d.%m.%Y",
                     provider_api_key=provider_config.get("api_key"),
                     provider_internal_url=provider_config.get("url", ""),
+                    provider_external_url=provider_config.get("external_domain", ""),
                 ))
 
             if target_configs: