Add clone support for scene and automation cards, update sync clock descriptions

- Scene clone: opens capture modal with prefilled name/description/targets
  instead of server-side duplication; removed backend clone endpoint
- Automation clone: opens editor with prefilled conditions, scene, logic,
  deactivation mode (webhook tokens stripped for uniqueness)
- Updated sync clock i18n descriptions to reflect speed-only-on-clock model
- Added entity card clone pattern documentation to server/CLAUDE.md

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

server/src/wled_controller/storage/scene_preset_store.py

@@ -117,25 +117,6 @@ 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}")