refactor: Remove Temporal and only use date-fns

[moonmeister]

We were using both. Switched to date-fns only

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[Copilot]

Pull Request Overview

This PR refactors the code to remove the dependency on Temporal in favor of date-fns and date-fns-tz.

• Removed Temporal imports and related calls in favor of date-fns/date-fns-tz functions
• Updated date handling in both feed generation and API response headers to use standard Date objects and date-fns functions

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
src/lib/feed.js	Replaced Temporal with date-fns-tz for generating formatted dates in the feed
src/pages/api/feeds/[feed-type].js	Removed Temporal usage and updated date parsing and header formatting with date-fns functions

Files not reviewed (1)

• package.json: Language not supported

Comments suppressed due to low confidence (2)

src/lib/feed.js:59

• Ensure that using new Date() together with the provided timeZone option in date-fns-tz produces the exact behavior previously achieved by Temporal.Now.plainDateISO; verify that the current date used here aligns correctly with the intended timezone.

copyright: format(new Date(), "yyyy", {

src/pages/api/feeds/[feed-type].js:82

• Verify that new Date(if_modified_since) reliably creates a valid Date object from the header value; consider adding error handling or validation if there's a risk of an invalid date causing unexpected comparisons.

compareAsc(last_modified, new Date(if_modified_since)) < 0) // Replaced Temporal.PlainDateTime.compare

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[colinmurphy]

LGTM 🚀 🚀 🚀

That looks like a really good library too for dates.

I also manually reviewed and validated the sitemap using - https://www.xml-sitemaps.com/validate-xml-sitemap.html