feat(eq): name Bluetooth devices from the system pairing list

A Bluetooth device only reports its own name through
AudioDeviceInfo.productName while it is enumerated as an active output, i.e.
while it is connected. Paired-but-switched-off devices therefore had no name
to fall back on, and the platform-name cache is in-memory only by design
(bt-device-identity ADR-4), so it self-heals per session ONLY for whatever
happens to be connected. Every other device showed its raw id.

Android already knows those names: BluetoothAdapter.getBondedDevices() lists
every pairing with its name and MAC, connected or not, and nothing in this
app was asking. Read it and seed the platform-name cache from it, keyed
bt_a2dp:<uppercase MAC> to match the ids the audio layer emits.

Seeded BEFORE the active-device query so a live enumeration name, being the
fresher of the two, still wins; a user's custom name outranks both. Re-read
on refrescarDispositivoActual so pairing or renaming a device in system
settings shows up as soon as the list becomes visible.

Reading the bond list is gated by BLUETOOTH_CONNECT from API 31 and by the
legacy BLUETOOTH permission below it, so declare the latter with
maxSdkVersion 30. It is a normal permission: granted at install, no runtime
prompt, no new friction. When the answer is unavailable — permission denied,
no adapter, Bluetooth off — both layers return an empty map rather than
throwing, and the row degrades to the id exactly as before.

Does not help rows persisted under a bt_a2dp:name: placeholder id: those
never had a MAC to match against.

android/app/src/main/AndroidManifest.xml

@@ -15,6 +15,14 @@
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
     <uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/>
+    <!--
+        Reading the paired-device list is gated by BLUETOOTH_CONNECT from API 31
+        and by this legacy permission below it. Normal permission: granted at
+        install, no runtime prompt.
+    -->
+    <uses-permission
+        android:name="android.permission.BLUETOOTH"
+        android:maxSdkVersion="30"/>
 
     <application
         android:label="PluriWave"

android/app/src/main/kotlin/es/freetimelab/pluriwave/MainActivity.kt

@@ -2,6 +2,7 @@ package es.freetimelab.pluriwave
 
 import android.Manifest
 import android.app.NotificationManager
+import android.bluetooth.BluetoothManager
 import android.content.ClipData
 import android.content.Intent
 import android.content.ActivityNotFoundException
@@ -1080,6 +1081,11 @@ class MainActivity : AudioServiceActivity() {
                     Log.d(tag, "audio_devices.requestBluetoothConnect")
                     result.success(requestBluetoothConnect())
                 }
+                "getBondedDeviceNames" -> {
+                    val names = bondedDeviceNames()
+                    Log.d(tag, "audio_devices.getBondedDeviceNames count=${names.size}")
+                    result.success(names)
+                }
                 else -> result.notImplemented()
             }
         }
@@ -1122,6 +1128,46 @@ class MainActivity : AudioServiceActivity() {
         return true
     }
 
+    /**
+     * Returns MAC -> name for every PAIRED Bluetooth device, connected or not.
+     *
+     * `AudioDeviceInfo.productName` only exists while a device is enumerated as
+     * an active output, so a paired-but-switched-off device can never report its
+     * own name and its row falls back to the raw id. The bond list is the
+     * system's own record and is the only source that survives disconnection.
+     *
+     * Returns an empty map instead of throwing when the answer is unavailable
+     * (BLUETOOTH_CONNECT denied, no adapter, device with Bluetooth off): a
+     * missing name must degrade to the id, never break device resolution.
+     */
+    private fun bondedDeviceNames(): Map<String, String> {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S &&
+            checkSelfPermission(Manifest.permission.BLUETOOTH_CONNECT)
+            != PackageManager.PERMISSION_GRANTED
+        ) {
+            Log.d(tag, "audio_devices.bondedDeviceNames BLUETOOTH_CONNECT not granted")
+            return emptyMap()
+        }
+        return try {
+            val manager = getSystemService(Context.BLUETOOTH_SERVICE) as? BluetoothManager
+            val adapter = manager?.adapter ?: return emptyMap()
+            adapter.bondedDevices
+                .orEmpty()
+                .mapNotNull { device ->
+                    val address = device.address
+                        ?.takeIf { it.isNotBlank() && it != bluetoothMacPlaceholder }
+                        ?: return@mapNotNull null
+                    val name = device.name?.takeIf { it.isNotBlank() }
+                        ?: return@mapNotNull null
+                    address.uppercase() to name
+                }
+                .toMap()
+        } catch (error: Throwable) {
+            Log.w(tag, "audio_devices.bondedDeviceNames failed", error)
+            emptyMap()
+        }
+    }
+
     private fun registerAudioDeviceCallback() {
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) return
         val audioManager = getSystemService(Context.AUDIO_SERVICE) as AudioManager