[isaacsa51]

Description

Change how the shadow pulse renders behind the island, this PR fixes and enhances how this render on the island.

Now it renders an "outline" with the blur specified to the setting, also now featuring a new option of opacity if the user needs a more pronounced or not shadow.

Type of change

• Bug fix
• New feature
• UI / visual update
• Performance improvement
• Refactoring / cleanup
• Translations
• Build / CI tooling

UI changes

Screen.Recording.20261023.222846.mp4

Checklist

Before submitting, please make sure:

• The base branch is set to develop (not main).
• The app builds cleanly locally with ./gradlew assembleDebug.
• Unit tests pass with ./gradlew testDebugUnitTest.
• You tested the changes on a device or emulator (including Shizuku or Root if applicable).
• New preferences use SettingsRepository for keys and getter/setter methods.
• New user-facing settings are registered in FeatureRegistry.kt for search indexing.
• New UI follows the design system in ui/core/ (RoundedCardContainer, IconToggleItem, etc.).
• Strings are added to res/values/strings.xml and drawables use rounded variants (R.drawable.rounded_*).

[isaacsa51]

sorry for the pings, once the PR is created for some reason I cant modify the target branch...