fix(ssr): stop content-card forcing always-on scrollbars; add tmp/ scratch dir
content-card used `overflow-scroll`, which renders scrollbar tracks even when the content fits — visible as superfluous bars around the admin chart cards. Switch to `overflow-auto` so scrollbars only appear when content genuinely overflows (e.g. wide data tables still scroll). Also add a gitignored ./tmp/ scratch directory (tracked via .gitkeep) and document in AGENTS.md that temp files belong there. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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