feat-sync - Add user preference sync for spoiler toggles and a couple small fixes

[mattsigal]

Pull Request

Summary

Adds settings profile backend sync properties for 3 spoiler-free preference toggles (hideDetailsMediaDescription, detailUseSeriesThumbnails, hideHomeMediaDescription), fixes detailsScreenBlur background opacity/blur linking on the config page, and safeguards media bar collection/library sources from being cleared on save.

Related Issues

Link related issues or tickets separated by commas.

• Closes #
• Fixes # [UI] Media bar not saving source collections selection Moonfin-Core#1087
• Related to # feat-ui - SPOILERZONE: The PR Moonfin-Core#1088

Type of Change

• Bug fix
• New feature
• Refactor
• Performance improvement
• API / endpoint change
• Settings schema change
• Documentation update
• Build/CI change
• Other (describe):

Area

• Settings sync / profiles
• Admin defaults / config page
• Ratings (MDBList / TMDB)
• Notifications / Push (FCM / relay)
• Seerr integration
• Games / Emulators
• Custom home rows
• Web Client (Go to Moonfin-Core repo)
• Other / shared

Changes Made

List the key changes included in this PR.

• Added hideDetailsMediaDescription, detailUseSeriesThumbnails, and hideHomeMediaDescription properties to MoonfinSettingsProfile.cs in both Jellyfin and Emby backend models to enable multi-device profile sync (desktop, mobile, tv).
• Fixed detailsScreenBlur save logic in configPage.html to save via getNullableRangeInput('#DefaultDetailsScreenBlur') as a numeric string (e.g. '10') matching C# models and per-device profile syncing.
• Safeguarded mediaBarCollectionIds and mediaBarLibraryIds save logic in configPage.html and moonfin.js so saving settings forms when the collection/library picker is unrendered does not overwrite saved collection IDs with null.

Client Impact

Does this need matching changes in a client repo (Core, Smart-TV, Roku)?

• No client changes needed
• Companion client PR(s) required, linked here: feat-ui - SPOILERZONE: The PR Moonfin-Core#1088
• New setting keys added. List each key and confirm it matches the client key exactly, including casing:
  • hideDetailsMediaDescription (bool?)
  • detailUseSeriesThumbnails (bool?)
  • hideHomeMediaDescription (bool?)

Compatibility

• Change to the settings profile is additive only, no renamed or removed properties
• New properties use the same type the client sends (a client bool maps to bool?, an int to int?)
• Migration added for any renamed or removed settings
• [ X] Older clients still work, unknown fields are ignored and no keys were removed

Testing

Describe how this change was tested.

• Built the plugin and deployed to a Jellyfin server
• Verified against a live client (which one:)
• Manual testing completed
• Not tested (explain why):

Test Steps

1. Verified JSON property names and types match Moonfin-Core synced_fields.dart keys exactly.
2. Verified detailsScreenBlur range input string formatting matches C# string? DetailsScreenBlur model expectations.
3. Verified mediaBarCollectionIds and mediaBarLibraryIds DOM existence checks prevent null overwrites on hidden tabs.

Screenshots (if applicable)

Include config page screenshots or request/response samples where relevant.

Checklist

• Code builds successfully
• Code follows project style and conventions
• No unnecessary commented-out code
• No new warnings introduced
• Any new setting keys match the client-side keys exactly

[github-actions]

Build Successful

The plugin compiled successfully against .NET 8 / Jellyfin 10.10.0.

Property	Value
Commit	b058ff5
Workflow	Build #284