Add obfuscate unseen episodes user setting and functionality

[corymills]

Summary

Adds a new user setting that allows users to hide episode artwork and blur episode descriptions for unseen episodes, helping avoid accidental spoilers.

Changes

• New User Setting: obfuscate_unseen_episodes field in the User model (defaults to off)
• UI Preferences Page: Added toggle in the UI Preferences settings to enable/disable the feature
• Media Details Template: Episode images are replaced with media poster artwork and descriptions are blurred when the setting is enabled and the episode hasn't been watched
• Database Migration: Added migration for the new user field

Testing

• Manual testing of the feature
• Added unit tests

[66Bunz]

It could be nice if when clicking the hidden image/plot it reveals

[corymills]

It could be nice if when clicking the hidden image/plot it reveals

I like that idea a lot. I've added this to the PR.

[andrebk]

Would it be better to blur the episode image, rather than using the season image in its place? Considering they usually use different aspect ratios, I would expect a lot of weird clipping when used like this.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.11%. Comparing base (30c26d8) to head (b0af8ea).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1067      +/-   ##
==========================================
- Coverage   82.31%   82.11%   -0.21%     
==========================================
  Files          78       78              
  Lines        7742     7744       +2     
==========================================
- Hits         6373     6359      -14     
- Misses       1369     1385      +16     

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[FuzzyGrim]

Thanks for the PR!

I added this:

Would it be better to blur the episode image, rather than using the season image in its place