feat: format timestamps in message events

[jvxz]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	magi	934153a	Commit Preview URL Branch Preview URL	May 06 2026, 01:41 AM

[greptile-apps]

Greptile Summary

This PR extracts timestamp rendering from message.vue into a dedicated timestamp.vue component and adds smart formatting: today's messages show hour/minute only, while older ones fall back to locale-default date display. A tooltip with the full weekday/date/time is shown on hover.

• The new component uses temporal-polyfill for date comparisons, with timezone handling correctly implemented via Temporal.Now.timeZoneId() to ensure the event date and "today" are compared in the same local zone.
• The isOld computed captures the current date at first evaluation; sessions that straddle midnight will not refresh the label for already-rendered messages, which is a minor cosmetic edge case.

Confidence Score: 5/5

Safe to merge; the change is a self-contained UI extraction with correct timezone-aware date comparison logic.

The timezone mismatch flagged in the previous review round has been addressed by using Temporal.Now.timeZoneId() consistently. The only remaining edge case — stale isOld across midnight — is cosmetic and confined to long-lived sessions. No data, auth, or Matrix SDK paths are touched.

No files require special attention.

Important Files Changed

Filename	Overview
app/components/page/room/event/message/timestamp.vue	New component that wraps NuxtTime with Temporal-based "is old" detection and a full-date tooltip; timezone handling is now correct using Temporal.Now.timeZoneId(), but isOld won't re-evaluate across midnight due to non-reactive Temporal.Now calls
app/components/page/room/event/message.vue	Replaced inline NuxtTime with the new PageRoomEventMessageTimestamp component; straightforward extraction with no logic changes
nuxt.config.ts	Adds temporal-polyfill as an auto-import preset so Temporal is globally available in components
package.json	Adds temporal-polyfill ^0.3.2 as a runtime dependency

_{Reviews (2): Last reviewed commit: "fix: use Temporal.Now.timeZoneId to get ..." | Re-trigger Greptile}