Fix screensaver dismiss-app after handoff, silent Immich fallback, and forced gradient (#146, #103, #142, #144)

[starbrightlab]

Three fixes from the issue triage, one commit each.

1. "Open app on dismiss" dies after the ~2-minute handoff (closes #146, most of #103)

PhotoDreamService's tap handler launches the chosen dismiss target, but the PhotoFramePreviewActivity continuation frame — which takes over when Android force-wakes the DreamService, i.e. most of the frame's lifetime under the default ALWAYS_ON mode — dismissed with a bare finish(). Its tap-exit now:

• launches ScreensaverDismiss.launchChosenApp(), gated to the DreamPolicy continuation relaunch via a new EXTRA_LAUNCH_DISMISS_APP intent extra — deliberate on-demand starts (settings preview, face picker, welcome preview, header button, MQTT screensaver command) still return to their caller, and the night clock always stays dark;
• calls PresenceHub.onInteraction() — finishing an Activity fires no dream-stop, so the hub stayed stuck on DREAMING and MQTT screen/state never published interactive after the handoff (MQTT screen/state never publishes "interactive" when Immortal overlay screensaver is dismissed on Gen-2 Portal #103, Gen-2 report);
• logs the exit under a new ImmortalFrame tag (the Open app (Home Assistant) on dismiss (Screen Saver) not working #146 reporter hit a "no logs at all" wall here).

2. Immich failures fall back to the stock feed with zero trace (#142, part 1 of 2)

The whole Immich chain was runCatching { … }.getOrNull() with no logging, by design — which made #142 (album selection silently showing the built-in feed) undiagnosable from user reports. Non-2xx responses now log method/endpoint/status plus the first 300 chars of the server's error body under ImmortalImmich, and the fallback swap logs under ImmortalPhotoFrame. The root-cause fix for the album filter follows once the reporter's curl test confirms what the server actually returns (asked on the issue).

3. Legibility gradient can't be disabled (closes #144)

FaceRenderer drew the bottom scrim unconditionally on every non-full-bleed face, even with every widget off. New showGradient setting (default on — the original look is unchanged), wired through the settings registry so it appears on-device and on the phone remote, gates the scrim.

Testing

• ./gradlew :app:testDebugUnitTest green, including the settings-registry completeness tripwires picking up the new showGradient spec.
• On-device confirmation still wanted for Open app (Home Assistant) on dismiss (Screen Saver) not working #146/MQTT screen/state never publishes "interactive" when Immortal overlay screensaver is dismissed on Gen-2 Portal #103 (tap the continuation frame with an HA dismiss target set; watch immortal/{id}/screen/state) — the reporters of both issues have offered to test.

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https://claude.ai/code/session_01DRTP7kN5WbzXFGoCWYR89s

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