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/api/routes/scene_presets.py

@@ -164,6 +164,28 @@ async def delete_scene_preset(
         raise HTTPException(status_code=404, detail=str(e))
 
 
+# ===== Clone =====
+
+@router.post(
+    "/api/v1/scene-presets/{preset_id}/clone",
+    response_model=ScenePresetResponse,
+    tags=["Scene Presets"],
+    status_code=201,
+)
+async def clone_scene_preset(
+    preset_id: str,
+    _auth: AuthRequired,
+    store: ScenePresetStore = Depends(get_scene_preset_store),
+):
+    """Duplicate a scene preset with all its stored target snapshots."""
+    try:
+        cloned = store.clone_preset(preset_id)
+    except ValueError as e:
+        raise HTTPException(status_code=404, detail=str(e))
+
+    return _preset_to_response(cloned)
+
+
 # ===== Recapture =====
 
 @router.post(