No font rendered in native mode (Dioxus headless native + bevy example)

**Problem**

Fonts are not rendered in the native-headless-in-bevy example when running on Linux (NixOS). Text appears missing/blank in the scene despite other rendering working.

**Steps To Reproduce**

Steps to reproduce the behavior:

- cd examples/10-integrations/native-headless-in-bevy
- cargo run
- Observe the rendered output: geometry appears, but expected text is not visible.

**Expected behavior**

Text/fonts should render correctly in the native headless Bevy integration example.

**Screenshots**

**Environment:**

- Dioxus version: v0.17.2
- Rust version: rustc 1.92.0 (ded5c06cf 2025-12-08)
- OS info: NixOS Unstable
- App platform: native/desktop

**Questionnaire**