Add image overlay controller with favorite toggle for photo slider

[Copilot]

When viewing images in the slider, there was no way to interact with an asset (e.g., mark as favorite). Videos already had an overlay controller; images had none.

Changes

MediaSlider submodule

• Enter key on IMAGE now shows/hides an image controller overlay (previously toggled slideshow). Slideshow is paused when the overlay appears.
• Back key dismisses the overlay; navigating to the next/prev asset also auto-dismisses it.
• DPad Left/Right passes through to the focus system when the overlay is visible (allowing button-to-button navigation within the overlay).
• Added isFavorite: Boolean to SliderItem with full Parcelable support.
• Added onFavoriteToggle: (String, Boolean) -> Unit companion callback on MediaSliderConfiguration (same pattern as onAssetSelected).
• New layouts/drawables: image_controller.xml (favorite + slideshow buttons), ic_favorite.xml, ic_favorite_border.xml.
• isControllerVisible() now also returns true when the image overlay is visible (preserves screensaver dismiss behavior).

App

• Asset gains isFavorite: Boolean = false; AssetUtil.toSliderItem() forwards it.
• ApiService: new PUT assets/{id} endpoint via Retrofit.
• ApiClient.updateFavorite(id, isFavorite) wraps the call.
• ImmichMediaSlider sets MediaSliderConfiguration.onFavoriteToggle to call updateFavorite and show a toast on success/failure.

// Wired up in ImmichMediaSlider.onViewCreated before loadMediaSliderView()
MediaSliderConfiguration.onFavoriteToggle = { assetId, isFavorite ->
    lifecycleScope.launch {
        apiClient.updateFavorite(assetId, isFavorite).fold(
            ifLeft  = { /* show error toast */ },
            ifRight = { /* show success toast */ }
        )
    }
}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• dl.google.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED -Xmx2048m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.9-bin/90cnw93cvbtalezasaz0blq0a/gradle-8.9/lib/gradle-daemon-main-8.9.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.9-bin/90cnw93cvbtalezasaz0blq0a/gradle-8.9/lib/agents/gradle-instrumentation-agent-8.9.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.9 (dns block)
  • Triggering command: /usr/bin/curl curl -s REDACTED grep -l (dns block)
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.lang.invoke=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.prefs/java.util.prefs=ALL-UNNAMED --add-opens java.prefs/java.util.prefs=ALL-UNNAMED --add-opens java.base/java.nio.charset=ALL-UNNAMED --add-opens java.base/java.net=ALL-UNNAMED --add-opens java.base/java.util.concurrent.atomic=ALL-UNNAMED -Xmx1536m (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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