fix(424): add throttled field to all StoryAgent ctors and handle HardBlock in ws.rs

The initial commit added the `throttled` field to `StoryAgent` but missed
several construction sites in lifecycle.rs, test_helpers.rs, and scan.rs.
Also adds the `HardBlock` match arm in the WebSocket event conversion and
minor CSS/import ordering fixes.

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

frontend/src/types.ts

@@ -70,11 +70,11 @@ export type WsResponse =
 
 // Re-export API client types for convenience
 export type {
+	CommandOutput as ApiCommandOutput,
+	FileEntry as ApiFileEntry,
 	Message as ApiMessage,
 	ProviderConfig as ApiProviderConfig,
-	FileEntry as ApiFileEntry,
 	SearchResult as ApiSearchResult,
-	CommandOutput as ApiCommandOutput,
 	WsRequest as ApiWsRequest,
 	WsResponse as ApiWsResponse,
 };