The visual test infrastructure changes in #46324 accidentally switched
from `settings::init(cx)` to `SettingsStore::test(cx)`, which uses
Courier font instead of the real Zed fonts (IBM Plex Sans / Lilex).

This restores the correct font loading:
1. Load embedded fonts with `Assets.load_fonts(cx)`
2. Use `settings::init(cx)` to get the real default settings with proper
fonts

Release Notes:

- N/A