fix: keep changelog dates visible when the table of contents is hidden

[garyli27]

Background

In a call with Luma Automation, they reported that the changelog sometimes shows no dates on Windows in Microsoft Edge, Perplexity Comet and Chrome at 100% browser zoom.

Why

Changelog dates only appeared in Mintlify's right-side table of contents, which Mintlify shows only at viewport width >= 1280px. Our style.css also hid the per-entry date column at every width. Windows laptops commonly run 125–150% display scaling, so at 100% browser zoom the viewport lands below 1280px (e.g. 1920px screen at 150% = 1280px, minus the 17px scrollbar = 1263px) and no date is shown anywhere. Phones and tablets had the same gap.

What changed

• Dates always visible: hide the per-entry date column only at >= 1280px (when the table of contents is shown); below that, the date is shown above each entry. Breakpoints use the same range syntax as Mintlify's xl so fractional widths from zoom always match exactly one rule.
• Anchor jumps on mobile: below 1024px Mintlify's scroll offset ignores the announcement banner (2–3 lines on phones), so jumps such as the banner's own changelog link landed with the date under the navbar. The offset now adds the banner height while the banner is visible.
• Date picker below 1280px (changelog-toc.js): a floating pill shows the current entry's date and opens the native select to jump to any date (updates the URL hash). Works on the 2026/2025/2024 changelogs in English and Chinese, follows client-side navigation, and is removed on regular docs pages.

Impact

• style.css and changelog-toc.js only; no content changes.
• Desktop at >= 1280px is unchanged.

Validation

• mintlify validate: passed.
• Local preview at 320–1920px: dates visible at every width (in the entry below 1280px, in the table of contents at >= 1280px).
• Anchor jumps at 320–1263px: date lands 32–40px below the navbar, with and without the banner.
• Date picker: jump, scroll tracking, client-side navigation between changelog years and to regular pages, light/dark, zh/en; mobile menu covers it; no overlap with the language selector.
• Injected the picker on production while HTML was still parsing (before hydration): no React hydration errors.

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