Show new posts since last visit with blue left border

[harijoe]

Summary

This PR adds a visual indicator for posts that are new since the user's last visit. On mount, the VideoList component reads a lastVisitAt timestamp from localStorage, immediately overwrites it with the current time, then compares each video's publish date against the saved timestamp. Posts newer than the previous visit get a blue left border (border-blue-400); all others get a transparent border to keep layout stable. First-time visitors see no indicators, since there is no prior timestamp to compare against.

Architecture Notes

• localStorage timestamp swap — The old timestamp is read and stored in React state before being overwritten with Date.now(), so the render uses the previous visit's baseline rather than the current one. This ensures newly arrived posts are highlighted only until the next visit.
• Transparent border as layout anchor — All articles always carry border-l-2; non-new posts use border-transparent instead of removing the border class, preventing a layout shift when the indicator appears after hydration.
• First-visit safety — seenBefore initialises as null and is only set when a prior key exists in storage, so the isNew check is always false on a first visit.

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Project	Deployment	Actions	Updated (UTC)
theostakes	Ready	Preview, Comment	Apr 7, 2026 4:08pm