fix(tauri): disable Linux CEF GPU startup path

[therahul-yo]

Summary

• Fixes AppImage does not launch on Manjaro #1697
• Adds Linux CEF startup flags to disable the hardware GPU path when launching the packaged app
• Extracts platform-specific CEF GPU workarounds into a testable helper while preserving the existing Intel macOS fallback
• Adds unit coverage for Linux, Intel macOS, and unaffected platform argument selection

Validation

• PASS: cargo fmt --manifest-path app/src-tauri/Cargo.toml --check
• BLOCKED: cargo test --manifest-path app/src-tauri/Cargo.toml platform_cef_gpu_workarounds
  • Cargo dependency fetch timed out downloading tokio-tungstenite from crates.io: [28] Timeout was reached (Operation too slow. Less than 10 bytes/sec transferred the last 30 seconds)

Notes

The reported AppImage failures on Manjaro/Arch show CEF/Chromium failing to create EGL GPU contexts before launch completes. For packaged Linux builds, preferring software compositing is a smaller recovery path than touching the bundler or distro-specific runtime dependencies.

Summary by CodeRabbit

• Refactor

  • Centralized GPU startup handling to unify platform-specific workarounds, improving startup reliability on Linux and Intel macOS.

• Tests

  • Updated unit tests to validate the consolidated GPU handling across platforms.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 68b5856e-906f-49cb-bf02-493592f5440b

📥 Commits

Reviewing files that changed from the base of the PR and between e8a115e and c6aa5c0.

📒 Files selected for processing (1)

• app/src-tauri/src/lib.rs

🚧 Files skipped from review as they are similar to previous changes (1)

• app/src-tauri/src/lib.rs

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📝 Walkthrough

Walkthrough

Refactors CEF GPU startup command-line workarounds into a reusable helper. Adds CefCommandLineArg and append_platform_cef_gpu_workarounds which append platform/arch-specific Chromium flags (Linux: --disable-gpu, --disable-gpu-compositing; macOS x86_64: --disable-gpu-compositing), updates the CEF args vector usage, and adds tests for these cases.

Changes

CEF GPU Workaround Helper Refactoring

Layer / File(s)	Summary
CEF GPU workaround helper and type alias app/src-tauri/src/lib.rs	CefCommandLineArg type alias and append_platform_cef_gpu_workarounds helper that conditionally appends GPU-disable flags for Linux (both flags) and Intel macOS x86_64 (compositing only), with info logs when flags are added.
Vector type update and helper invocation app/src-tauri/src/lib.rs	CEF command-line args vector element type updated to CefCommandLineArg; prior inline platform/arch GPU flag blocks replaced by a call to append_platform_cef_gpu_workarounds.
Unit tests for helper behavior app/src-tauri/src/lib.rs	Tests call append_platform_cef_gpu_workarounds directly to assert Linux disables GPU & GPU compositing, Intel macOS x86_64 disables GPU compositing only, and other OS/arch combinations add no GPU flags.

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs:

• tinyhumansai/openhuman#1809: Also modifies Tauri CEF command-line argument construction to add Linux GPU-disabling flags and touches app/src-tauri/src/lib.rs.

"🐰 I hopped through code with careful paws,
Extracted flags and tidied up the cause.
Linux mutes GPU, macOS tames compositing,
Tests check each path—no logic omitting.
A little rabbit cheers the cleaner laws!"

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: disabling Linux CEF GPU startup, which directly addresses the Manjaro AppImage launch failure.
Linked Issues check	✅ Passed	The PR successfully implements the objective from #1697 by adding Linux CEF GPU disable flags, extracting platform-specific workarounds into a testable helper, and adding unit test coverage.
Out of Scope Changes check	✅ Passed	All changes are directly related to the linked issue #1697: refactoring CEF GPU workarounds, adding Linux GPU flags, and updating tests for platform-specific argument selection.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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[therahul-yo]

Heads-up for reviewers: the two failing checks (Rust Core Tests + Quality, Rust Core Coverage) are pre-existing failures on main — not caused by this PR.

• Failures started at c37a122 (fix(jira): collect Atlassian subdomain and handle ConnectedAccount_MissingRequiredFields #1726, Composio Jira) and are still red on main's current HEAD e7c2eb7 (fix(tauri): disable GPU on Linux for Mesa 26+ EGL compatibility (closes #1697) #1809). See main's run on e7c2eb7c.
• The failing tests are in src/openhuman/composio/auth_retry and src/openhuman/accessibility/automation_state. This PR only touches app/src-tauri/src/lib.rs and adds a helper + unit tests in the same file — there's no path by which it could affect those core-crate tests.

Specifically:

• composio::auth_retry::tests::retries_once_only_even_when_second_call_still_errors — asserts 4 gateway hits, got 2. The test's own comment says it's pinning a compound-retry shape and will surface "if a future collapse of the two layers" happens; fix(jira): collect Atlassian subdomain and handle ConnectedAccount_MissingRequiredFields #1726 looks like it collapsed one of the layers.
• accessibility::automation_state::tests::concurrent_mark_and_read — assertion failed: system_events_denied() in a concurrency test.

Happy to rebase once main is green. Let me know if you'd like me to open a separate fix for the composio assertion.