Move auth to service, UI/UX improvements

- Service handles auth: auto-login via Quest SDK on onCreate, periodic
  token refresh, isAuthenticated/login AIDL methods
- Clients tab shows actual connected game clients from ClientTracker
  instead of plans filtered by status
- Create Plan service picker shows "YouTube - DisplayName" per linked
  account instead of raw service IDs
- createDefaultPlan AIDL method creates plan with one destination per
  linked account (unlisted)
- Session validation on Activity open via getMe() call
- Backend health indicator (green/red dot) on Dashboard nav icon
- ConnectedClientInfo parcelable for client data over AIDL
- SDK client exposes isAuthenticated, login, createDefaultPlan,
  getConnectedClients, authenticated StateFlow

sdk/src/main/java/com/omixlab/lckcontrol/sdk/LckControlClient.kt

@@ -5,6 +5,7 @@ import android.content.Context
 import android.content.Intent
 import android.content.ServiceConnection
 import android.os.IBinder
+import com.omixlab.lckcontrol.shared.ConnectedClientInfo
 import com.omixlab.lckcontrol.shared.ILckControlCallback
 import com.omixlab.lckcontrol.shared.ILckControlService
 import com.omixlab.lckcontrol.shared.LinkedAccount
@@ -28,6 +29,9 @@ class LckControlClient(private val context: Context) {
     private val _connected = MutableStateFlow(false)
     val connected: StateFlow<Boolean> = _connected.asStateFlow()
 
+    private val _authenticated = MutableStateFlow(false)
+    val authenticated: StateFlow<Boolean> = _authenticated.asStateFlow()
+
     private val _streamPlans = MutableStateFlow<List<StreamPlan>>(emptyList())
     val streamPlans: StateFlow<List<StreamPlan>> = _streamPlans.asStateFlow()
 
@@ -44,6 +48,10 @@ class LckControlClient(private val context: Context) {
 
         override fun onClientRegistered(id: String) {}
         override fun onClientUnregistered(id: String) {}
+
+        override fun onAuthStateChanged(authenticated: Boolean) {
+            _authenticated.value = authenticated
+        }
     }
 
     private val connection = object : ServiceConnection {
@@ -51,12 +59,14 @@ class LckControlClient(private val context: Context) {
             service = ILckControlService.Stub.asInterface(binder)
             service?.registerCallback(callback)
             _connected.value = true
+            _authenticated.value = service?.isAuthenticated ?: false
         }
 
         override fun onServiceDisconnected(name: ComponentName?) {
             service = null
             clientId = null
             _connected.value = false
+            _authenticated.value = false
         }
     }
 
@@ -80,18 +90,39 @@ class LckControlClient(private val context: Context) {
         service = null
         clientId = null
         _connected.value = false
+        _authenticated.value = false
     }
 
+    // ── Auth ────────────────────────────────────────────
+
+    fun isAuthenticated(): Boolean {
+        return service?.isAuthenticated ?: false
+    }
+
+    fun login() {
+        service?.login()
+    }
+
+    // ── Client registration ─────────────────────────────
+
     fun registerAsClient(clientName: String, packageName: String): String? {
         val id = service?.registerClient(clientName, packageName)
         clientId = id
         return id
     }
 
+    fun getConnectedClients(): List<ConnectedClientInfo> {
+        return service?.connectedClients ?: emptyList()
+    }
+
+    // ── Accounts ────────────────────────────────────────
+
     fun getLinkedAccounts(): List<LinkedAccount> {
         return service?.linkedAccounts ?: emptyList()
     }
 
+    // ── Stream plans ────────────────────────────────────
+
     fun getStreamPlans(): List<StreamPlan> {
         return service?.streamPlans ?: emptyList()
     }
@@ -104,6 +135,10 @@ class LckControlClient(private val context: Context) {
         return service?.createStreamPlan(config)
     }
 
+    fun createDefaultPlan(clientName: String): StreamPlan? {
+        return service?.createDefaultPlan(clientName)
+    }
+
     fun prepareStreamPlan(planId: String): StreamPlan? {
         return service?.prepareStreamPlan(planId)
     }