fix: FIT-733: Process images in templates

[luarmr]

Test for thumbnails.

[netlify]

✅ Deploy Preview for label-studio-docs-new-theme canceled.

Name	Link
🔨 Latest commit	ee34da2
🔍 Latest deploy log	https://app.netlify.com/projects/label-studio-docs-new-theme/deploys/68d5dd702bef68000890d827

[netlify]

✅ Deploy Preview for label-studio-storybook canceled.

Name	Link
🔨 Latest commit	ee34da2
🔍 Latest deploy log	https://app.netlify.com/projects/label-studio-storybook/deploys/68d5dd7044bc470008b07b69

[netlify]

✅ Deploy Preview for heartex-docs canceled.

Name	Link
🔨 Latest commit	ee34da2
🔍 Latest deploy log	https://app.netlify.com/projects/heartex-docs/deploys/68d5dd701cbdbf0007aaf6d1

[netlify]

✅ Deploy Preview for label-studio-playground canceled.

Name	Link
🔨 Latest commit	ee34da2
🔍 Latest deploy log	https://app.netlify.com/projects/label-studio-playground/deploys/68d5dd7099bba300081c83d2

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 67.49%. Comparing base (c620e51) to head (ee34da2).
⚠️ Report is 40 commits behind head on develop.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
label_studio/projects/api.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8537   +/-   ##
========================================
  Coverage    67.49%   67.49%           
========================================
  Files          780      780           
  Lines        59636    59638    +2     
  Branches     10136    10136           
========================================
+ Hits         40250    40252    +2     
  Misses       19383    19383           
  Partials         3        3           

Flag	Coverage Δ
lsf-e2e	54.77% <ø> (-0.01%)	⬇️
lsf-integration	51.37% <ø> (+<0.01%)	⬆️
lsf-unit	8.61% <ø> (ø)
pytests	79.89% <50.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

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

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.