feat(ui): Rename app from MyIce to MyIceK

Update the app display name in all user-visible locations:
Android manifest label, desktop window title, login screen,
and schedule screen top bar.

Refs #2

composeApp/src/desktopMain/kotlin/ch/parano/myice/Main.kt

@@ -22,7 +22,7 @@ import androidx.compose.ui.window.application
 import ch.parano.myice.auth.DesktopOAuthClient
 
 fun main() = application {
-    Window(onCloseRequest = ::exitApplication, title = "MyIce") {
+    Window(onCloseRequest = ::exitApplication, title = "MyIceK") {
         App(oauthClient = DesktopOAuthClient())
     }
 }