Revert "Cache desktop build assets in CI and release workflows"

[juliusmarminge]

Reverts #2543

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Note

Medium Risk
Touches CI/release workflows for caching and release artifact handoff; failures here can break builds or publishing even though no application code changes.

Overview
Reverts the previous approach of caching desktop build assets across jobs and instead uses GitHub Artifacts to pass desktop release outputs from the build matrix to the release job.

In ci.yml, replaces separate actions/cache/restore + conditional actions/cache/save steps with single actions/cache steps for Bun/Turbo and Playwright, removing the explicit save phases.

In release.yml, collects build outputs into release-publish/, uploads them via actions/upload-artifact, and later downloads/merges them via actions/download-artifact (removing the per-platform cache restore + staging logic).

^{Reviewed by Cursor Bugbot for commit 11c8fa7. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Revert desktop build asset caching to use upload/download artifact steps in CI and release workflows

• Reverts the previously cached CI build approach: ci.yml switches back to unified actions/cache@v5 steps (combined restore/save) for Bun/Turbo and Playwright caches, removing separate restore and save steps.
• In release.yml, the build matrix job now uploads artifacts via actions/upload-artifact@v7 into a flat release-publish directory instead of saving to cache; the step errors if no files are found.
• The publish_cli job now downloads all desktop-* artifacts via actions/download-artifact@v8 with merge-multiple: true directly into release-assets, replacing four separate cache restore steps and an intermediate staging copy.

^{Macroscope summarized 11c8fa7.}

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Approvability

Verdict: Approved

This revert PR only modifies CI workflow files (.github/workflows/ci.yml and release.yml), changing caching and artifact passing strategies without affecting any production code or runtime behavior.

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