Fix image viewer glitch

[ganfra]

• Fix glitch when transitioning from thumbnail to content
• Open avatars using overlay mode instead of backstack

[github-actions[bot]]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.72%. Comparing base (41126c7) to head (acae30b). Report is 42 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #3537 +/- ## =========================================== + Coverage 82.68% 82.72% +0.03% =========================================== Files 1732 1732 Lines 40904 40898 -6 Branches 4973 4973 =========================================== + Hits 33823 33833 +10 + Misses 5316 5304 -12 + Partials 1765 1761 -4 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud