fix(ci): cache and install Playwright browsers in e2e job

[rekmarks]

The e2e CI job was failing on #843 with "Executable doesn't exist" for the Playwright Chromium binary. The root cause: the prepare job installs dependencies with PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD=1 and caches node_modules. When the e2e job restores that cache, yarn install is skipped entirely, so postinstall/playwright-install.sh never runs and the browsers are never downloaded. Playwright browsers live in ~/.cache/ms-playwright/, not in node_modules, so they are not covered by the node_modules cache.

Changes

• Add a Playwright browser cache step (actions/cache) to the e2e job, keyed on runner.os + yarn.lock hash so it automatically invalidates when Playwright is updated.
• Add an Install Playwright browsers step that runs yarn playwright install chromium only on a cache miss, and always installs Playwright dependencies, which are not cached.
• Bump Playwright deps to trigger cache miss in CI.

Testing

This is a CI configuration change. It is verified by pushing the branch and confirming the E2E Tests / omnium-gatherum (and sibling matrix) jobs pass. On the first run the cache will miss and download Chromium; subsequent runs with the same yarn.lock will hit the cache and skip the download.

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Note

Low Risk
CI/workflow and dependency-version updates only; main risk is longer first-run CI times or cache-key issues affecting E2E job reliability.

Overview
Prevents E2E CI failures caused by missing Playwright Chromium binaries when node_modules is restored from cache and Playwright postinstall doesn’t run.

Updates the e2e GitHub Actions job to cache ~/.cache/ms-playwright (keyed by OS + yarn.lock) and to install Playwright Chromium on cache miss, plus always install required system deps via playwright install-deps.

Bumps Playwright tooling to ^1.58.2 across the repo (root playwright devDependency and workspace @playwright/test/playwright versions), updating yarn.lock accordingly.

^{Written by Cursor Bugbot for commit fb33ca9. This will update automatically on new commits. Configure here.}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​playwright/​test@​1.57.0 ⏵ 1.58.2
	playwright@​1.57.0 ⏵ 1.58.2	+1

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	78.22% 🟰 ±0%	6508 / 8320
🔵	Statements	78.17% 🟰 ±0%	6613 / 8459
🔵	Functions	76.01% 🟰 ±0%	1626 / 2139
🔵	Branches	78.16% 🟰 ±0%	2406 / 3078

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