Remove modelId from session metadata. Not needed, we grab it from the last assistantmessage.

packages/web-ui/src/storage/stores/sessions-store.ts

@@ -103,7 +103,6 @@ export class SessionsStore extends Store {
 				cacheWrite: 0,
 				cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
 			},
-			modelId: state.model?.id || null,
 			thinkingLevel: state.thinkingLevel || "off",
 			preview: "",
 		};

packages/web-ui/src/storage/types.ts

@@ -128,9 +128,6 @@ export interface SessionMetadata {
 		};
 	};
 
-	/** Last used model ID (e.g., "claude-sonnet-4") */
-	modelId: string | null;
-
 	/** Last used thinking level */
 	thinkingLevel: ThinkingLevel;