t66: app names on a device that exposes none

The reported Shield names no app: `pm dump com.netflix.ninja` is ~2241 lines of
dumpsys and grep for `application-label` over the whole capture finds nothing.
The probe shipped `| head -300`, which cut the dump BEFORE the package section,
so "no label" was a truncation artefact; the sweep then named every app after
its own package id, and the apps editor pre-filled the `pkg=pkg` row the user
read as a bug.

  * the probe greps ON THE DEVICE for the three shapes Android prints
    (`application-label`, `nonLocalizedLabel`, `labelRes`); a quoted value is a
    name, `null` and a resource id are not. The dump is never truncated.
  * after APP_LABEL_PROBE_LIMIT consecutive "ran, no label" answers the device
    is taken at its word: the sweep stops spending a shell per package
    (APP_LABEL_TTL expiry re-checks, and a package whose probe FAILED still owes
    its retry — t57 UNIT 0 survives, driven by the app on screen).
  * ONE precedence chain in `ha_adb_common/app_label.resolve_package_name`, used
    by the media player, the Current App sensor, the discovery table, the source
    list and the apps editor: user map > device label > curated map > package id
    (the id shown ONCE, `name` empty when nothing names the app).
  * the curated table covers the user's 21 apps (community-maintained, not
    device truth) and the Configure row says when the device named nothing.
  * the real device shape is a test fixture (trimmed, and marked as such in the
    file: the raw capture is not in the repo) pinning that no label is
    extracted, that the probe count is bounded, and that `Netflix` surfaces.

Also drops the dead `ATTR_MEDIA_DAG_NOW_PLAYING` re-exports left by the t65
flattening and updates the RESEARCH_SHIELD now-playing note to the flat names.

No real Shield was available: the fetch/burst behaviour is exercised against the
documented Android output and the trimmed reproduction of the reported capture.

custom_components/nvidia_shield/ha_adb_common/const.py

@@ -17,9 +17,11 @@ ATTR_MEDIA_DAG_RECEIVER_INPUT = "media_dag_receiver_input"
 # Jellyfin media_player entity for rich metadata
 ATTR_MEDIA_DAG_JELLYFIN_ENTITY = "media_dag_jellyfin_entity"
 
-# Now-playing dict: {state, title, media_type, series?, season?, episode?,
-#                    duration?, position?, thumbnail?, artist?, album?, media_info?, source?}
-ATTR_MEDIA_DAG_NOW_PLAYING = "media_dag_now_playing"
+# t65 flattened the now-playing reading into separate top-level ``now_playing_*``
+# attributes on the media player (``now_playing_via`` names the tier), so the single
+# nested ``media_dag_now_playing`` key this file used to define is GONE — the last
+# reference to it was removed in t66's cleanup. The flattened names live in
+# ``custom_components/nvidia_shield/media_player.py`` (``now_playing_attribute_names``).
 
 # List of running app dicts: [{package, state, title?, artist?}, ...]
 ATTR_MEDIA_DAG_RUNNING_APPS = "media_dag_running_apps"