chore: untrack generated base.css, build it in test/CI paths
base.css is a Tailwind build artifact already listed in .gitignore, but it had been tracked since it was first committed (gitignore can't untrack an already-tracked file), so it kept getting re-committed against intent. Untrack it to match js/dist (the TS artifact, also gitignored + untracked). Because nothing in the test path rebuilt it, e2e/static serving relied on the committed copy. Add 'css' (and 'ts') as prerequisites of the test/test-e2e make targets and a Build CSS step in CI so the stylesheet is generated before tests run. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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