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/sensor.py

@@ -124,9 +124,10 @@ class NvidiaShieldCurrentAppSensor(NvidiaShieldSensorBase):
         """The resolved friendly name (t40), not the raw package id.
 
         Exactly the ``media_player.app_name`` chain via the shared
-        ``resolve_app_name``: apps map → cached manifest label → the package
-        text itself. A bare or unknown package shows its package text rather
-        than None, like the media player's app_name.
+        ``resolve_app_name``: apps map → cached device label → the built-in app
+        names (t66) → the package text itself. A bare or unknown package shows its
+        package text rather than None, like the media player's app_name, and that
+        text is the id ONCE — never a ``pkg=pkg`` pair.
 
         This is why ``_package`` must be the CURRENT app and the label fetch
         must be driven off it (t55): the device-manifest label is resolved on