feat(api-input): expose timeout/interpolation, fix 422 on light turn-on

- coordinator.update_source now auto-injects source_type from cached data so
  the server's discriminated-union body validates (was rejecting
  fallback_color updates with 422).
- Add Fallback Timeout (number) and Interpolation (select) entities per
  api_input CSS source.
- Light no longer zeros fallback_color on turn_off; state restored across
  HA restarts via RestoreEntity so the chosen default color persists.
- Bump manifest to 0.2.2 and update en/ru translations.

custom_components/ledgrab/coordinator.py

@@ -349,7 +349,20 @@ class LedGrabCoordinator(DataUpdateCoordinator):
         await self.async_request_refresh()
 
     async def update_source(self, source_id: str, **kwargs: Any) -> None:
-        """Update a color strip source's fields."""
+        """Update a color strip source's fields.
+
+        The server uses a discriminated-union body keyed on ``source_type``;
+        if the caller didn't supply it, look it up from the cached sources so
+        the request validates server-side.
+        """
+        if "source_type" not in kwargs and self.data:
+            for source in self.data.get("css_sources", []):
+                if source.get("id") == source_id:
+                    src_type = source.get("source_type")
+                    if src_type:
+                        kwargs["source_type"] = src_type
+                    break
+
         async with self.session.put(
             f"{self.server_url}/api/v1/color-strip-sources/{source_id}",
             headers={**self._auth_headers, "Content-Type": "application/json"},