Visual consistency: unify cards + responsive grids + section rhythm

[nmbrthirteen]

Conservative, additive CSS pass (all scoped under .aggregate-it) to make pages align:

• .ai-cards grid is responsive (auto-fit) instead of fixed 4 columns.
• Topic Hubs cards now use the same tokens as the dashboard cards (24px tabular-nums value, matching border/radius/padding, muted label) — the two card systems look identical.
• Uniform 16px spacing below every postbox.

No PHP changes; 86 tests green.

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Reviewing files that changed from the base of the PR and between 5ab6441 and 936112d.

📒 Files selected for processing (1)

• assets/css/admin.css

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/visual-consistency

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