feat(android): rename display name to "Punktfunk" + drop the Settings "Done" button

- Display name capitalized: app_name (launcher label + permission dialogs) and the connect-screen
  header are now "Punktfunk". Package/applicationId/service names stay lowercase.
- Settings: removed the redundant "Done" button (the bottom tab bar is the navigation; system Back
  still returns to Connect). Dropped the now-unused imports.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

clients/android/app/src/main/kotlin/io/unom/punktfunk/MainActivity.kt

@@ -342,7 +342,7 @@ private fun ConnectScreen(settings: Settings, onConnected: (Long) -> Unit) {
             horizontalAlignment = Alignment.CenterHorizontally,
         ) {
             Spacer(Modifier.height(8.dp))
-            Text("punktfunk", style = MaterialTheme.typography.headlineLarge)
+            Text("Punktfunk", style = MaterialTheme.typography.headlineLarge)
             Text(
                 "stream a remote desktop",
                 style = MaterialTheme.typography.bodyMedium,

clients/android/app/src/main/kotlin/io/unom/punktfunk/SettingsScreen.kt

@@ -8,10 +8,8 @@ import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
@@ -24,7 +22,6 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Switch
 import androidx.compose.material3.Text
-import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -114,9 +111,6 @@ fun SettingsScreen(initial: Settings, onChange: (Settings) -> Unit, onBack: () -
                 },
             )
         }
-
-        Spacer(Modifier.height(8.dp))
-        TextButton(onClick = onBack) { Text("Done") }
     }
 }
 

clients/android/app/src/main/res/values/strings.xml

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="app_name">punktfunk</string>
+    <string name="app_name">Punktfunk</string>
 </resources>