enhance: Alt text in image viewer

[nullobsi]

What

Added a little box that shows alt text or image name in the PhotoSwipe image viewer.

Why

Improved the experience and makes alt text easier to read on mobile devices, like it is on Mastodon and Twitter.

Additional info (optional)

https://fedi.nullob.si/notes/95q4yywihr has example images.

[codecov[bot]]

Codecov Report

Merging #9109 (f0ccae2) into develop (3feaf39) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #9109   +/-   ##
========================================
  Coverage    22.62%   22.62%           
========================================
  Files          731      731           
  Lines        68482    68482           
  Branches      2028     2028           
========================================
  Hits         15495    15495           
  Misses       52987    52987           

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[tamaina]

デザインそこそこ変えた

p1.a9z.devで動作中

[syuilo]

🙏🏻