Font size setting not applied to UI or terminal

[PrakharMNNIT]

Bug Description

The appearance.fontSize setting exists in the settings data model (default: 14) but is never applied to the DOM or terminal. The terminal hardcodes fontSize: 14. There is no UI control to change font size in Settings.

Steps to Reproduce

1. Open Settings → General → Appearance
2. Notice there is no font size control
3. The terminal always uses 14px regardless of any setting

Expected Behavior

• Font size should be configurable via a UI control in Settings
• Changing font size should update the chat feed text and terminal
• The setting should persist across sessions

Actual Behavior

• No font size control exists in the Settings UI
• settings.appearance.fontSize is defined but has no createEffect to apply it to CSS variables
• Terminal hardcodes fontSize: 14 instead of reading from settings

Environment

• Platform: macOS (desktop app via Tauri), also affects web UI
• Observed on latest dev branch

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• **Feature Request: Persist default font size / zoom level in OpenCode Desktop** #10423: Requests persisting default font size/zoom level across sessions (closed) — closely related to the font size setting not being applied
• [FEATURE]: Add font customization support to opencode.json config #12503: Feature request for font customization (including fontSize) via opencode.json config — overlaps with the font size configuration aspect of this issue

If your issue is distinct from these, please clarify how it differs.