fix: install clippy for main branch cache checks

[richiemcilroy]

The main-only Rust cache jobs call cargo clippy without installing Clippy for Rust 1.88.0. The Windows cache job failed with cargo-clippy.exe is not installed, after its debug build and release-profile check had passed.

Install the component explicitly, matching the dedicated Clippy job. This changes one workflow line and does not change desktop code. It follows the validation of #2215, which is already merged.

Validation: YAML parsing passed; the parsed workflow differs only by the added component. Actionlint reports the same eight pre-existing diagnostics before and after, with no new diagnostics. The dedicated Windows Clippy job passed on the same source and toolchain with this component installed. The repaired main-only cache job needs confirmation in its next main run.

Greptile Summary

This PR installs Clippy explicitly for the main-branch Rust cache matrix so its existing cargo clippy step can run with Rust 1.88.0.

• Adds components: clippy to the cache job’s Rust toolchain setup.
• Leaves desktop source and runtime behavior unchanged.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
.github/workflows/ci.yml	Adds the missing Clippy component to the Rust cache matrix using the same toolchain configuration pattern already used by the dedicated Clippy job.

_{Reviews (2): Last reviewed commit: "fix: install clippy for main branch cach..." | Re-trigger Greptile}

[richiemcilroy]

hey @greptileai, please re-review the PR