#274 fix(linux): select Wayland backend and add WebKit safe mode

[Anonymous]

Originally created by: kristofferR

Carrier can select an unavailable GTK backend in pure Wayland sessions, and some WebKit compositing configurations leave its window blank.

Select the Wayland backend before GTK initialization when DISPLAY and GDK_BACKEND are unset or empty. Add an automatic Niri compositing fallback and a documented CARRIER_LINUX_WEBKIT_SAFE_MODE override. Preserve explicit GTK and WebKit settings and retain the existing Wayland DMABUF workaround.

Validation: formatting, Clippy, 252 Rust tests, 453 Bun tests, typechecking, inject rebuild, and full local CodeRabbit preflight passed. An isolated Hyprland session opened native Wayland windows with DISPLAY and GDK_BACKEND unset; forced safe mode rendered Facebook's login/consent page, while normal compositing remained blank after 28 seconds. CPU samples were not comparable because only one mode rendered content. Niri, GNOME, KDE, and the remaining platform/performance checks are pending in [#28].

Ref [#255].

[Anonymous]

Originally posted by: kristofferR

@coderabbitai review

[Anonymous]

Originally posted by: kristofferR

@codex review for consequential defects introduced by this PR; do not expand its original scope with unrelated refactors, features, or speculative hardening

[Anonymous]

Originally posted by: coderabbitai[bot]

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[Anonymous]

Originally posted by: chatgpt-codex-connector[bot]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed <relative-time datetime="2026-09-06T17:55:45.734596Z">2026-09-06T17:55:45.734596Z</relative-time>	61070c7	Manual request

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📒 Files selected for processing (3)

• README.md
• src-tauri/src/lib.rs
• src-tauri/src/linux_startup.rs

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[Anonymous]

Originally posted by: chatgpt-codex-connector[bot]

Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: 61070c794d

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[Anonymous]

Ticket changed by: kristofferR

• status: open --> closed