Fix default timeout value.

Many callsites don’t pass duration, relying on the default.
The way the default was specified was wrong, resulting in an 'undefined' value
if no duration is passed instead of 5000.
Passing `undefined` to setTimeout causes an immediate timeout (in practise
a very shortly visible TUI toast UI.

Author: CarloWood

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

@@ -37,7 +37,7 @@ export const TuiEvent = {
       title: z.string().optional(),
       message: z.string(),
       variant: z.enum(["info", "success", "warning", "error"]),
-      duration: z.number().default(5000).optional().describe("Duration in milliseconds"),
+      duration: z.number().optional().default(5000).describe("Duration in milliseconds"),
     }),
   ),
   SessionSelect: BusEvent.define(