* feat(app): separate content typography from interface size
Readable prose benefits from its own scale without inflating navigation and controls. Preserve existing users’ rendered size during migration while giving fresh desktop installs a 15px content default.
* test(app): cover independent content typography
The appearance journey now verifies that changing interface size leaves content size intact. Timeline traversal yields when a test deliberately holds the requested page, so the helper no longer waits on its own gate.
* test(desktop): cover independent content typography
The desktop appearance regression follows the renamed Interface control and verifies it does not alter Content size.
Treat the appearance setting as the rendered base size so the type ramp scales predictably. Native starts one pixel larger while web and desktop preserve the authored 14px base, with legacy values migrated on load.
Keep parsed chat and tool detail content in sync with appearance token changes. Hide font-family controls on native, use One as the default syntax theme, add Swift highlighting, and give Nord a distinct light palette.
