[Desktop] Double-clicking title bar fails to maximize window

[shanebishop1]

Description

I think users would expect double-clicking the title bar to maximize the OpenCode Desktop window (and revert to the window's original size when double-clicked again).

https://github.com/user-attachments/assets/a32321bf-89c1-4efa-a2e9-a9744609ef92

Plugins

No response

OpenCode version

1.1.25

Steps to reproduce

1. Open the desktop app
2. Double-click an empty section of the title bar
3. Observe that the window size doesn't change

Screenshot and/or share link

No response

Operating System

macOS 15.5

Terminal

No response