feat(running_apps): media_dag_running_apps enrichment — TTL-capped last_known_state/last_known_title for apps without a live session (P3-3b)

custom_components/nvidia_shield/ha_adb_common/running_apps.py

@@ -12,6 +12,7 @@ def running_apps_from_tasks(
     recent_tasks: list[dict],
     media_sessions: list[MediaSessionInfo] | None = None,
     foreground_package: str | None = None,
+    last_known: dict[str, MediaSessionInfo] | None = None,
 ) -> list[dict] | None:
     """Build a list of running app dicts from recent tasks + media sessions.
 
@@ -19,6 +20,9 @@ def running_apps_from_tasks(
         recent_tasks: List of {"package": str} from ADB recent tasks.
         media_sessions: Optional media sessions for playback state enrichment.
         foreground_package: The current foreground app package.
+        last_known: Optional per-package TTL-filtered last-known-state cache
+            (P3-3b) — apps without a live session carry their last known
+            playback state as ``last_known_state``/``last_known_title``.
 
     Returns None if there are fewer than 2 apps (no point showing a switcher
     with only one option).
@@ -57,6 +61,15 @@ def running_apps_from_tasks(
                 app["artist"] = session.artist
         else:
             app["state"] = "running"
+            # P3-3b: no live session — surface the TTL-capped last-known state
+            cached = (last_known or {}).get(pkg)
+            if cached is not None:
+                if cached.playing:
+                    app["last_known_state"] = "playing"
+                elif cached.paused:
+                    app["last_known_state"] = "paused"
+                if cached.title:
+                    app["last_known_title"] = cached.title
 
         apps.append(app)