#278 fix: use native WebView user-agent identities

[Anonymous]

Originally created by: kristofferR

Carrier hardcodes Safari 17.4 on macOS and Chrome 124 on Windows and Linux, even though Linux runs WebKit. Leave the user agent unset so each embedded engine supplies its native identity, with compatibility exceptions centralized in one policy module.

Added policy-selection/fallback tests and a platform verification matrix. Navigation, CSP, and remote-origin restrictions are unchanged.

Validation: cargo fmt, Clippy with warnings denied, 257 Rust tests, and bun run check (485 tests, lint, typechecking, bundle regeneration) pass. Local CodeRabbit preflight findings were checked: clarified the probe date's timezone; Settings already uses a separate builder.

A WebKitGTK 2.52.6 probe reached the login form with both native and previous user agents. Authenticated functionality and macOS/Windows/oldest-supported-version testing remain pending, documented in docs/user-agent-policy.md; this is not full compatibility qualification.

Ref [#258]

[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

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📥 Commits

Reviewing files that changed from the base of the PR and between [2b12db] and eb8269eedf1c83061f183852b7350cbb867f11e8.

📒 Files selected for processing (4)

• docs/user-agent-policy.md
• src-tauri/src/lib.rs
• src-tauri/src/user_agent.rs
• src-tauri/src/window.rs

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[Anonymous]

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

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed <relative-time datetime="2026-09-06T23:52:32.007781Z">2026-09-06T23:52:32.007781Z</relative-time>	eb8269e	Manual request

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

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

Reviewed commit: eb8269eedf

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[Anonymous]

Ticket changed by: kristofferR

• status: open --> closed