Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Problem

Users must manually locate and edit opencode.json to configure the app (both global and project-level config), then restart the app for changes to take effect. This is disruptive to the workflow. Additionally, some newer users may not even know where to find the config file

Proposed Solution

Allow editing the config directly from within the app's settings UI, with changes applied immediately, no restart required , or an auto restart

Considerations

Requires a JSON editor within the desktop app
Should support both global config (~/.config/opencode/opencode.json) and project-level config (./opencode.json)
JSON validation/error feedback would improve safety