refactor(config): one Shield IP field for both transports (t41)

The two address fields were the same Shield spelled twice, and every bug in the
zeroconf/IP-change path came from keeping them in sync. One field now:

* const.CONF_HOST replaces CONF_ADB_HOST / CONF_PROTOCOL_HOST in the setup form,
  the options page, the pairing forms, the reconfigure/reauth seeding and the
  description copy. ADB port 5555 stays the only port field;
* helpers.entry_host(entry) is the single resolver (options first, then data);
  resolve_adb_config and the protocol settings both go through it, so both
  transports read the same value at call time (the t32 F1 factory re-read keeps
  working: the NEXT built poller sees the new address);
* helpers.seed_host / seed_adb_enabled own the YAML seed's shape rule. A block
  may use `host` or the legacy protocol_host/adb_host keys — t41 keeps the old
  spelling working — and t32 F4's outcome is unchanged: a protocol-only block
  leaves ADB off, an address (or an explicit adb_enabled) turns it on;
* the zeroconf IP-change path collapses the t21-F2 per-host dance into one rule:
  the discovery address IS the entry's address, so the entry is updated when it
  differs and left alone when it matches. The blank-self-heal and
  deliberately-different-ADB-host cases are gone with the duplication — a
  second address field cannot express them anymore, and the tests now pin that
  (previously "an explicit override is never clobbered");
* the options page exposes the protocol toggle it never had (the page could turn
  ADB off but not the protocol);
* button.py (granted to this task) reads the entry's own address instead of
  another integration's entity.

The v3 entry migration that maps existing adb_host/protocol_host onto CONF_HOST
and drops the androidtv key lands in the next commit; HA runs migrations before
setup, so an existing entry is never read with the old shape.

Verified: 311 passed / 2 skipped, 312 / 1 with androidtvremote2, ruff clean,
drift engine exit 0 on HEAD. The UI-copy contract tests (every rendered field
has a label in strings.json AND translations/en.json, key trees identical, host
errors name the field) drove the string edits.

custom_components/nvidia_shield/translations/en.json

@@ -3,45 +3,41 @@
     "step": {
       "user": {
         "title": "NVIDIA Shield",
-        "description": "{discovery_note}Set up your NVIDIA Shield. Everything here is optional except one state source \u2014 an Android TV Remote entity, the Nvidia Remote Protocol, or ADB. Link the devices and services you want to use.",
+        "description": "{discovery_note}Set up your NVIDIA Shield. Everything here is optional except one state source \u2014 the Nvidia Remote Protocol or ADB. Link the devices and services you want to use.",
         "data": {
           "name": "Name",
-          "androidtv_entity": "Android TV Remote entity",
           "jellyfin_entity": "Jellyfin media player",
           "receiver_entity": "Receiver",
           "receiver_input": "Receiver input",
           "power_entity": "Power switch",
           "adb_enabled": "Read state over ADB",
           "adb_store_app_info": "Show title and artist",
-          "adb_host": "ADB host (IP address)",
+          "host": "The Shield's IP address",
           "adb_port": "ADB port",
-          "protocol_enabled": "Add the Nvidia Remote Protocol",
-          "protocol_host": "Protocol host (IP address)"
+          "protocol_enabled": "Add the Nvidia Remote Protocol"
         },
         "data_description": {
-          "androidtv_entity": "The media_player entity from the Android TV Remote integration. Leave blank if you use the Nvidia Remote Protocol or ADB instead.",
           "jellyfin_entity": "The Jellyfin media_player for this Shield. Leave blank to detect it automatically.",
           "receiver_entity": "The receiver or soundbar this Shield plays through.",
           "receiver_input": "The receiver input the Shield uses, for example 'Shield'. Leave blank if you are not sure.",
           "power_entity": "A smart plug switch, if you want reliable on/off detection.",
           "adb_enabled": "Reads now-playing information over ADB from any app. Requires Developer options > Network debugging on the Shield.",
           "adb_store_app_info": "Shows the title and artist from non-Jellyfin apps. Turn off to show only the app name (privacy mode).",
-          "adb_host": "The Shield's IP address. Pre-filled when the Shield was discovered, or when an Android TV Remote entity is set \u2014 change it only if you need a different address.",
+          "host": "The Shield's IP address. Pre-filled when the Shield was discovered \u2014 change it only if you need a different address.",
           "adb_port": "The ADB port. The standard value is 5555 \u2014 change it only if ADB uses a custom port on your network.",
-          "protocol_enabled": "Adds the all-in-one remote-protocol transport (power, availability, app push and volume readout). It needs a one-time PIN pairing right after this step.",
-          "protocol_host": "The Shield's IP address for the remote protocol. Pre-filled when the Shield was discovered \u2014 leave blank to use the ADB host."
+          "protocol_enabled": "Adds the all-in-one remote-protocol transport (power, availability, app push and volume readout). It needs a one-time PIN pairing right after this step."
         }
       },
       "adb_pair": {
         "title": "Allow ADB access",
         "description": "On the Shield, open Settings > System > Developer options and turn on Network debugging (it may be called ADB debugging). Then select Submit \u2014 the Shield shows an Allow prompt; approve it. Nothing happened? Check the address below and select Submit again. Not now? Turn on 'Continue without ADB pairing' and select Submit.",
         "data": {
-          "adb_host": "ADB host (IP address)",
+          "host": "The Shield's IP address",
           "adb_port": "ADB port",
           "skip_pairing": "Continue without ADB pairing"
         },
         "data_description": {
-          "adb_host": "The Shield's IP address. Pre-filled when the Shield was discovered \u2014 change it only if the Shield moved or you gave it a different address.",
+          "host": "The Shield's IP address. Pre-filled when the Shield was discovered \u2014 change it only if the Shield moved or you gave it a different address.",
           "adb_port": "The standard ADB port is 5555.",
           "skip_pairing": "Finishes setup now and leaves ADB unpaired. The Pair ADB button stays available on the device page, so you can pair later."
         }
@@ -51,12 +47,12 @@
         "description": "While this step is open the Shield shows a pairing code. Type it below and select Submit. If no code appears on the Shield, check the IP address below and select Submit again \u2014 pairing restarts and the Shield shows a new code. To set up without the remote protocol, turn on 'Continue without protocol pairing'.",
         "data": {
           "pairing_code": "Pairing code shown on the Shield",
-          "protocol_host": "Protocol host (IP address)",
+          "host": "The Shield's IP address",
           "skip_pairing": "Continue without protocol pairing"
         },
         "data_description": {
           "pairing_code": "The code the Shield displays while this step is open.",
-          "protocol_host": "The Shield's IP address. Pre-filled when the Shield was discovered \u2014 change it if the Shield moved.",
+          "host": "The Shield's IP address. Pre-filled when the Shield was discovered \u2014 change it if the Shield moved.",
           "skip_pairing": "Finishes setup with the remote protocol off \u2014 it stays off until you pair it. Pair later from this integration's entry menu: choose Reconfigure."
         }
       },
@@ -67,11 +63,11 @@
     },
     "error": {
       "adb_failed": "The Shield did not accept the ADB connection. Make sure Network debugging is on, approve the Allow prompt on the Shield, then select Submit to try again.",
-      "adb_no_host": "No IP address for the Shield yet. Fill in the ADB host field above (a discovered Shield, or one linked to an Android TV Remote entity, is pre-filled automatically).",
-      "protocol_no_host": "No IP address for the Shield yet. Fill in the protocol host field above (a discovered Shield, or one linked to an Android TV Remote entity, is pre-filled automatically).",
+      "adb_no_host": "No IP address for the Shield yet. Fill in the host field above (a discovered Shield is pre-filled automatically).",
+      "protocol_no_host": "No IP address for the Shield yet. Fill in the host field above (a discovered Shield is pre-filled automatically).",
       "protocol_pair_failed": "The Shield rejected that pairing code. Check the code on the Shield and select Submit to try again.",
       "protocol_unavailable": "The androidtvremote2 library is not installed, so the remote protocol cannot pair. Install it and restart Home Assistant, or turn on 'Continue without protocol pairing' to finish setup anyway.",
-      "no_state_source": "No state source selected. Choose at least one: an Android TV Remote entity, 'Add the Nvidia Remote Protocol', or 'Read state over ADB'.",
+      "no_state_source": "No state source selected. Choose at least one: 'Add the Nvidia Remote Protocol' or 'Read state over ADB'.",
       "invalid_app_map": "Each line must be package=name with a non-empty package (no spaces) and a non-empty name \u2014 for example ar.tvplayer.tv=TiviMate.",
       "invalid_digit_delay": "The digit delay must be between 0.05 and 1.0 seconds."
     },
@@ -101,8 +97,9 @@
           "receiver_input": "Receiver input",
           "power_entity": "Power switch",
           "adb_enabled": "Read state over ADB",
+          "protocol_enabled": "Add the Nvidia Remote Protocol",
           "adb_store_app_info": "Show title and artist",
-          "adb_host": "ADB host (IP address)",
+          "host": "The Shield's IP address",
           "adb_port": "ADB port",
           "app_name_map": "App names and icons",
           "adb_command_enabled": "Enable the adb_command service",
@@ -117,7 +114,8 @@
           "power_entity": "A smart plug switch, if you want reliable on/off detection.",
           "adb_enabled": "Reads now-playing information over ADB from any app. Requires Developer options > Network debugging on the Shield.",
           "adb_store_app_info": "Shows the title and artist from non-Jellyfin apps. Turn off to show only the app name (privacy mode).",
-          "adb_host": "The Shield's IP address. Leave blank to use the Android TV Remote entity's address.",
+          "host": "The Shield's IP address. Change it only if the Shield moved or you gave it a different address.",
+          "protocol_enabled": "Adds the all-in-one remote-protocol transport (power, availability, app push and volume readout). Turning it on needs a one-time PIN pairing \u2014 use Reconfigure on the entry to pair.",
           "adb_port": "The ADB port. The standard value is 5555.",
           "app_name_map": "One entry per line, package=name (for example ar.tvplayer.tv=TiviMate), with an optional |icon after the name. Leave blank to clear.",
           "adb_command_enabled": "Adds the nvidia_shield.adb_command service (a raw ADB shell command over the persistent connection). Security-relevant: leave it off unless you need it \u2014 the same opt-in posture as the core androidtv integration.",