fix: --model flag being ignored in TUI mode (#4147)

packages/opencode/src/cli/cmd/tui/thread.ts

@@ -97,6 +97,7 @@ export const TuiThreadCommand = cmd({
         continue: args.continue,
         sessionID: args.session,
         agent: args.agent,
+        model: args.model,
         prompt,
       },
       onExit: async () => {