[ui] Homepage: Replace all left occurrences of gridView with homepageGridView

[cbentejac]

Description

This pull request updates the thumbnail refresh logic in the Homepage.qml file to use the correct grid view reference. This ensures that thumbnails are updated reliably in the homepage grid.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.67%. Comparing base (35381b9) to head (0ec1ccd).
⚠️ Report is 2 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2991   +/-   ##
========================================
  Coverage    81.67%   81.67%           
========================================
  Files           69       69           
  Lines         9144     9144           
========================================
  Hits          7468     7468           
  Misses        1676     1676           

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[Copilot]

Pull request overview

Updates the homepage thumbnail refresh wiring so thumbnail cache notifications target the correct GridView instance, improving reliability of thumbnail updates on the homepage projects grid.

Changes:

• Replaced gridView references with homepageGridView inside the ThumbnailCache.onThumbnailCreated handler.
• Updated the fallback scan loop to iterate over homepageGridView items.

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