Fix ubuntu-latest Actions build by enabling Linux backend for eframe/winit

[Copilot]

Build for ubuntu-latest failed in GitHub Actions because winit compiled without any Linux platform backend when eframe defaults were disabled. This PR enables an explicit Linux backend so Ubuntu builds can compile consistently.

• Dependency feature correction

  • Update eframe features in Cargo.toml to include Linux windowing support (x11) alongside existing wgpu/default_fonts.
  • Keep default-features = false intact; only add the missing platform feature.

• Lockfile alignment

  • Regenerate Cargo.lock to capture the dependency graph introduced by the new eframe feature set.

# Cargo.toml
eframe = { version = "0.29.0", default-features = false, features = ["default_fonts", "wgpu", "x11"] }

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[dddevid]

@coderabbitai review

[Copilot]

Copilot review overview

🟡 Changes recommended

Regenerate Cargo.lock from the exact manifest to remove unintended glow dependencies.

Review effort: Lite
Findings: None

What changed in this PR

This PR enables eframe’s X11 backend for Ubuntu builds and updates the dependency lockfile.

Changes:

• Adds the x11 feature to eframe.
• Updates Cargo.lock.
• Lockfile currently includes unintended glow dependencies and should be regenerated.

File	Summary
Cargo.toml	Enables the eframe X11 backend.
Cargo.lock	Records dependency resolution, but includes an unintended glow renderer dependency.

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