build: add --cfg tokio_unstable to cargo rustflags (fixes GUI crash at startup)

[rafa57600]

What

Add rustflags = ["--cfg", "tokio_unstable"] to .cargo/config.toml so every Cargo build gets the cfg flag the code already requires.

Why

console-subscriber ^0.5.0 is an unconditional dependency, and rog-control-center/src/main.rs calls console_subscriber::init() unconditionally. When Tokio was not compiled with --cfg tokio_unstable, that call panics at startup and rog-control-center aborts immediately (SIGABRT → core dump):

thread 'main' panicked at .../console-subscriber-0.5.0/src/lib.rs:266:9:
task tracing requires Tokio to be built with RUSTFLAGS="--cfg tokio_unstable"!

The flag is not committed anywhere in the repo: not in .cargo/config.toml, not in the Makefile, not in distro-packaging/PKGBUILD, not in the CI workflows. So any build of the release tarball without a specially-set RUSTFLAGS env produces a GUI that cannot start.

Impact

• Official Arch Linux extra package (rog-control-center 6.4.0-2, built from this tarball): GUI crashes on every launch.
• The project's own release.yml build path (distro-packaging/PKGBUILD → make build → plain cargo build) is affected the same way.
• Any other distro/CI building from the tarball: same.

Test

# before the fix (as distro PKGBUILDs build):
cargo build --release --all-features && ./target/release/rog-control-center  # aborts
# after the fix: the GUI starts and stays open

Verified locally against 6.4.0 (the Arch PKGBUILD with this flag builds and runs correctly; without it, crashes).

🤖 Generated with AnthraCode (https://anthracode.com)

Closes #363

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Repository UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 5d22d0a and be3d6d2.

📒 Files selected for processing (1)

• .cargo/config.toml

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📜 Recent review details

🔇 Additional comments (1)

.cargo/config.toml (1)

11-11: 🎯 Functional Correctness

Keep the single [build] table header.

.cargo/config.toml contains one [build] declaration. The duplicate-table finding does not apply.

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📝 Summary

Summary by CodeRabbit

• Build Improvements
  • Updated build configuration to enable required Tokio functionality for the control center.

Walkthrough

The Cargo configuration now applies --cfg tokio_unstable to all Rust builds. This supports the console-subscriber startup check in rog-control-center.

Changes

Tokio build configuration

Layer / File(s)	Summary
Enable Tokio unstable compilation .cargo/config.toml	Adds the tokio_unstable Rust flag to the global Cargo build configuration.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to be3d6

This enables the Tokio configuration required by console-subscriber, preventing the control center from aborting during startup. No merge-blocking risk is established.

Suggested labels: fix, rog-control-center

Suggested reviewers: ghoul4500

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding the Tokio unstable configuration to Cargo to prevent the GUI startup crash.
Description check	✅ Passed	The description explains what changed, why it was required, the startup failure, affected build paths, the issue, and local verification. The hardware and environment fields and checklist items are no…

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[Ghoul4500]

This is an AI hallucination and violates our contributing guidelines. This will be closed as slop.