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/database/models.py

@@ -141,6 +141,7 @@ class TemplateConfig(SQLModel, table=True):
     memory_mode_message: str = Field(default="")
 
     date_format: str = Field(default="%d.%m.%Y, %H:%M UTC")
+    date_only_format: str = Field(default="%d.%m.%Y")
 
     created_at: datetime = Field(default_factory=_utcnow)
 
@@ -221,8 +222,12 @@ class EventLog(SQLModel, table=True):
 
     id: int | None = Field(default=None, primary_key=True)
     tracker_id: int | None = Field(default=None, foreign_key="tracker.id")
+    tracker_name: str = Field(default="")
+    provider_id: int | None = Field(default=None)
+    provider_name: str = Field(default="")
     event_type: str
     collection_id: str
     collection_name: str
+    assets_count: int = Field(default=0)
     details: dict[str, Any] = Field(default_factory=dict, sa_column=Column(JSON))
     created_at: datetime = Field(default_factory=_utcnow)