Add tags to all entity types with chip-based input and autocomplete

- Add `tags: List[str]` field to all 13 entity types (devices, output targets,
  CSS sources, picture sources, audio sources, value sources, sync clocks,
  automations, scene presets, capture/audio/PP/pattern templates)
- Update all stores, schemas, and route handlers for tag CRUD
- Add GET /api/v1/tags endpoint aggregating unique tags across all stores
- Create TagInput component with chip display, autocomplete dropdown,
  keyboard navigation, and API-backed suggestions
- Display tag chips on all entity cards (searchable via existing text filter)
- Add tag input to all 14 editor modals with dirty check support
- Add CSS styles and i18n keys (en/ru/zh) for tag UI
- Also includes code review fixes: thread safety, perf, store dedup

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/storage/device_store.py

@@ -2,11 +2,11 @@
 
 import json
 import uuid
-from datetime import datetime
+from datetime import datetime, timezone
 from pathlib import Path
 from typing import Dict, List, Optional
 
-from wled_controller.utils import get_logger
+from wled_controller.utils import atomic_write_json, get_logger
 
 logger = get_logger(__name__)
 
@@ -33,6 +33,7 @@ class Device:
         send_latency_ms: int = 0,
         rgbw: bool = False,
         zone_mode: str = "combined",
+        tags: List[str] = None,
         created_at: Optional[datetime] = None,
         updated_at: Optional[datetime] = None,
     ):
@@ -48,8 +49,9 @@ class Device:
         self.send_latency_ms = send_latency_ms
         self.rgbw = rgbw
         self.zone_mode = zone_mode
-        self.created_at = created_at or datetime.utcnow()
-        self.updated_at = updated_at or datetime.utcnow()
+        self.tags = tags or []
+        self.created_at = created_at or datetime.now(timezone.utc)
+        self.updated_at = updated_at or datetime.now(timezone.utc)
 
     def to_dict(self) -> dict:
         """Convert device to dictionary."""
@@ -75,6 +77,8 @@ class Device:
             d["rgbw"] = True
         if self.zone_mode != "combined":
             d["zone_mode"] = self.zone_mode
+        if self.tags:
+            d["tags"] = self.tags
         return d
 
     @classmethod
@@ -93,8 +97,9 @@ class Device:
             send_latency_ms=data.get("send_latency_ms", 0),
             rgbw=data.get("rgbw", False),
             zone_mode=data.get("zone_mode", "combined"),
-            created_at=datetime.fromisoformat(data.get("created_at", datetime.utcnow().isoformat())),
-            updated_at=datetime.fromisoformat(data.get("updated_at", datetime.utcnow().isoformat())),
+            tags=data.get("tags", []),
+            created_at=datetime.fromisoformat(data.get("created_at", datetime.now(timezone.utc).isoformat())),
+            updated_at=datetime.fromisoformat(data.get("updated_at", datetime.now(timezone.utc).isoformat())),
         )
 
 
@@ -158,11 +163,7 @@ class DeviceStore:
                 }
             }
 
-            temp_file = self.storage_file.with_suffix(".tmp")
-            with open(temp_file, "w") as f:
-                json.dump(data, f, indent=2)
-
-            temp_file.replace(self.storage_file)
+            atomic_write_json(self.storage_file, data)
 
             logger.debug(f"Saved {len(self._devices)} devices to storage")
 
@@ -181,6 +182,7 @@ class DeviceStore:
         send_latency_ms: int = 0,
         rgbw: bool = False,
         zone_mode: str = "combined",
+        tags: Optional[List[str]] = None,
     ) -> Device:
         """Create a new device."""
         device_id = f"device_{uuid.uuid4().hex[:8]}"
@@ -200,6 +202,7 @@ class DeviceStore:
             send_latency_ms=send_latency_ms,
             rgbw=rgbw,
             zone_mode=zone_mode,
+            tags=tags or [],
         )
 
         self._devices[device_id] = device
@@ -228,6 +231,7 @@ class DeviceStore:
         send_latency_ms: Optional[int] = None,
         rgbw: Optional[bool] = None,
         zone_mode: Optional[str] = None,
+        tags: Optional[List[str]] = None,
     ) -> Device:
         """Update device."""
         device = self._devices.get(device_id)
@@ -252,8 +256,10 @@ class DeviceStore:
             device.rgbw = rgbw
         if zone_mode is not None:
             device.zone_mode = zone_mode
+        if tags is not None:
+            device.tags = tags
 
-        device.updated_at = datetime.utcnow()
+        device.updated_at = datetime.now(timezone.utc)
         self.save()
 
         logger.info(f"Updated device {device_id}")