fix: unify back navigation copy on meetup pages

[Elydeboss]

I fixed navigation hierarchy inconsistencies in the meetup flow by standardizing back link terminology and destinations to follow proper parent-child navigation patterns.

What Changed
Problem: The meetup pages (/meetup/[meetupId] and /meetup/[meetupId]/circles) used inconsistent navigation:

Confusing "Back to Passport" terminology
Flat navigation structure (both jumped to /meetup)
Didn't follow logical parent-child hierarchy used elsewhere in the app
Solution: Implemented hierarchical navigation matching the app's organizer flows:

/meetup/[meetupId]/circles now goes back to /meetup/[meetupId] (RSVP page)
/meetup/[meetupId] now goes back to /meetup (meetup list)
Updated terminology to be more contextually appropriate
Files Modified
src/app/meetup/[meetupId]/page.tsx - Updated back link text and destination
src/app/meetup/[meetupId]/circles/page.tsx - Updated back link text and destination.

How to Test
Test RSVP Page Navigation:
Navigate to /meetup/[some-meetup-id]
Verify back link shows "← Back to meetups"
Click back link and confirm it navigates to /meetup

Test Builder Circles Navigation:
Navigate to /meetup/[some-meetup-id]/circles
Verify back link shows "← Back to RSVP"
Click back link and confirm it navigates to the RSVP page for that meetup

Test Complete User Flow:
Navigate: Home → /meetup → RSVP → Circles
Test step-back navigation: Circles → RSVP → Meetups → Home
Verify each back link works correctly and follows proper hierarchy

Verify Visual Consistency:
Confirm styling matches other pages (blue text, proper spacing)
Check hover states work correctly
Ensure no visual regressions.

[FrankezeCode]

Thanks for picking this up, @Elydeboss — the Builder Circles back link is a solid fix 👍

What works well

• /meetup/[meetupId]/circles → “Back to RSVP” with link to /meetup/[meetupId] matches the user flow.

Please update before merge

1. Remove unrelated files from this PR:

   • .nvmrc
   • package-lock.json (large lockfile churn isn’t needed for a nav copy fix)

   Tip: if those changes came from running npm install locally, you can reset them with:

   git checkout main -- package-lock.json
   git rm --cached .nvmrc   # if .nvmrc wasn't on main