WT 1131 june fundraiser

[bluewave41]

One-line summary

Creates a banner for the mid year 2026 fundraiser.

Waiting for translations to finish this.

Significant changes and points to review

Issue / Bugzilla link

https://mozilla-hub.atlassian.net/browse/WT-1131

Testing

• Checkout this PR
• Navigate to http://localhost:8000/en-US/?v=2 (green variant)
• The donate button should link to https://www.mozillafoundation.org/?form=26MY-PBA
• Test all screen sizes ensuring visuals look alright
• Navigate to http://localhost:8000/en-US/?v=3 (orange variant)
• The donate button should link to https://www.mozillafoundation.org/?form=26MY-PBB
• Visual aspects should be the same for both variants minus the color

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.34%. Comparing base (e8e2529) to head (761a123).
⚠️ Report is 25 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17194      +/-   ##
==========================================
+ Coverage   82.31%   82.34%   +0.03%     
==========================================
  Files         181      181              
  Lines        9692     9709      +17     
==========================================
+ Hits         7978     7995      +17     
  Misses       1714     1714              

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