feat(plugin): support Nuvio JS scrapers and redesign settings UI

[Himanth-reddy]

This PR fixes compatibility for Nuvio JS scraper plugins and redesigns the Plugins settings UI to align with other screens.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Don’t override the sideload plugin flag in release

For sideloadRelease (and staging via initWith(release)), this build-type FEATURE_PLUGINS_ENABLED=false takes precedence over the sideload flavor’s FEATURE_PLUGINS_ENABLED=true, so the generated BuildConfig disables plugins in release-grade sideload APKs. SettingsScreen only adds the Plugins section when this flag is true, so production sideload users lose the UI needed to add or manage the Nuvio scrapers this change is adding; keep the flag flavor-scoped or set it true for sideload release variants.

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[ProdigyV21]

Is this finished or you still working on it? I looked at it and these are my findings so far.

Findings
[P1] It conflicts with current main. The conflict is in SettingsScreen.kt between catalog-pack modal handling and the new plugin modal handling. Rebase and preserve both conditions.

[P1] Plugins are disabled in production sideload builds. app/build.gradle.kts:125 overrides FEATURE_PLUGINS_ENABLED to false for release and staging. I confirmed:
Sideload Debug: true
Sideload Release/Staging: false
Remove those build-type overrides and retain the existing flavor values: Play false, Sideload true.

[P2] Mobile opens the wrong settings page. SettingsScreen.kt:3900 routes both “Addons” and “Plugins & Extensions” to the Stremio addons screen. Mobile cannot access the redesigned plugin screen.

[P2] Reset does not completely unload extensions. ExternalExtensionLoader.kt:661 deletes files and caches, but extension extractors already registered globally can remain active until the app restarts.

[P2] Reset can leave TV focus out of range. After clearing a long plugin list, the selected index is not reset or clamped, temporarily leaving no visible focused row.

[Himanth-reddy]

I thought i would get some response from the testers but they didn't so let them complain in the next update.