fix(LinkBubbleView): Don't choke on invalid URLs

[mejo-]

Fixes "TypeError: URL constructor: ... is not a valid URL."

Fixes: #6841

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits

[mejo-]

/backport to stable32

[codecov]

Codecov Report

❌ Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.67%. Comparing base (a0fa51b) to head (24aa144).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/components/Link/LinkBubbleView.vue	41.66%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #7864 +/- ##
==========================================
+ Coverage 52.86% 59.67% +6.80% 
==========================================
Files 501 500 -1 Lines 43354 38411 -4943 Branches 1063 1064 +1 ==========================================
+ Hits 22918 22920 +2 + Misses 20329 15383 -4946 - Partials 107 108 +1 

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[mejo-]

/backport to stable31

[kousu]

Thanks for squashing this!!