Add clone support for scene presets and update TODO

- Add clone_preset() to ScenePresetStore with deep copy of target snapshots
- Add POST /scene-presets/{id}/clone API endpoint
- Add clone button to scene preset cards in Automations tab
- Add i18n keys for clone feedback in all 3 locales
- Add TODO items for dashboard stats collapse and protocol badge review

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

server/src/wled_controller/storage/scene_preset_store.py

@@ -6,7 +6,7 @@ from datetime import datetime
 from pathlib import Path
 from typing import Dict, List, Optional
 
-from wled_controller.storage.scene_preset import ScenePreset
+from wled_controller.storage.scene_preset import ScenePreset, TargetSnapshot
 from wled_controller.utils import atomic_write_json, get_logger
 
 logger = get_logger(__name__)
@@ -117,6 +117,25 @@ class ScenePresetStore:
         logger.info(f"Recaptured scene preset: {preset_id}")
         return existing
 
+    def clone_preset(self, preset_id: str) -> ScenePreset:
+        """Duplicate an existing preset with a new ID and '(Copy)' suffix."""
+        if preset_id not in self._presets:
+            raise ValueError(f"Scene preset not found: {preset_id}")
+
+        source = self._presets[preset_id]
+        new_id = f"scene_{uuid.uuid4().hex[:8]}"
+        cloned = ScenePreset(
+            id=new_id,
+            name=f"{source.name} (Copy)",
+            description=source.description,
+            targets=[TargetSnapshot.from_dict(t.to_dict()) for t in source.targets],
+            order=source.order,
+        )
+        self._presets[new_id] = cloned
+        self._save()
+        logger.info(f"Cloned scene preset: {preset_id} -> {new_id}")
+        return cloned
+
     def delete_preset(self, preset_id: str) -> None:
         if preset_id not in self._presets:
             raise ValueError(f"Scene preset not found: {preset_id}")