Handbook: add a Recent Updates page (weekly handbook changes)

[dimitrieh]

Description

Adds a handbook Recent Updates page at /handbook/recent-changes/ that lists what changed in the handbook each week (newest first), so the team can review the previous week's changes at the Monday review.

• Build-time data module (nuxt/server/lib/handbookChanges.mjs) reads git history (git log --name-status) over the handbook content and groups changes by ISO week (Monday start). It scans both the new nuxt/content/handbook/ and legacy src/handbook/ paths, so handbook history survives the Nuxt migration, and folds both onto the same /handbook/... URLs.
• Exposed via a Nitro route (/api/handbook-changes) that runs during prerender, so the data is inlined into the static page (no server or git needed at runtime).
• Each week shows the affected pages, then a separate "Pull Requests and Commits" list, deduplicated by PR number (a PR's multiple commits collapse into one row), falling back to the commit SHA for direct pushes.
• Rendered by HandbookRecentChanges.vue, used in recent-changes.md via the ::handbook-recent-changes MDC component. Large weeks (for example the migration's bulk file move) collapse into a <details>.
• 10 unit tests cover the week grouping, path-to-URL mapping, and PR-level dedup.

Related Issue(s)

n/a

Checklist

• I have read the contribution guidelines
• I have considered the performance impact of these changes
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
• For blog PRs, an Art Request has been created (instructions)

[dimitrieh]

@UnicornGunnerz this PR should make it so that there is a page in the handbook that collects what has been changed each week for the general meeting. You can check it out when the preview is ready by changing the url to /handbook/recent-changes/

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[UnicornGunnerz]

@dimitrieh, that's pretty interesting. Will this be public, though? Would others be able to see all our changes?

[dimitrieh]

Direct preview link is at https://deploy-preview-5169--flowforge-website.netlify.app/handbook/recent-changes

that's pretty interesting. Will this be public, though? Would others be able to see all our changes?

@UnicornGunnerz this takes into account any changes to the handbook which is a public repository. No information gets shared that isn't already public.

@ZJvandeWeg can you take look here? Code and the experience of it needs a brief review (I think the page is slightly slow to load? 🤔)

[UnicornGunnerz]

Approving it but ZJ or Claude should check the code to make sure that it works?