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.

tests/test_config_flow_ux.py

@@ -2250,8 +2250,9 @@ class TestDiscoveryFeedsTheAppsTable:
             [
                 {"package": "ar.tvplayer.tv", "name": "TiviMate", "icon": "mdi:television-classic"},
                 {"package": "org.xbmc.kodi", "name": "Kodi", "icon": "mdi:kodi"},
-                {"package": "com.example.handmade", "name": "com.example.handmade",
-                 "icon": "mdi:television"},
+                # t66: a discovered app nothing can name comes through as name ""
+                # (the sweep no longer repeats the package id as a name)
+                {"package": "com.example.handmade", "name": "", "icon": "mdi:television"},
             ],
         )
 
@@ -2263,7 +2264,9 @@ class TestDiscoveryFeedsTheAppsTable:
         assert lines[0] == "ar.tvplayer.tv=Telly"
         # every discovered app is a row too — this is the live bug
         assert "org.xbmc.kodi=Kodi" in lines
-        assert "com.example.handmade=com.example.handmade" in lines
+        # ...but an app nothing names is NOT pre-filled as `pkg=pkg` (t66): the id
+        # would be stored as if it were a name. The row editor still offers it.
+        assert not [line for line in lines if line.startswith("com.example.handmade=")]
         # the user's name wins over the device label for the same package
         assert not [line for line in lines if line == "ar.tvplayer.tv=TiviMate"]
         # ...and the discovered icon is NEVER written into the icon column