Take ktfmt's formatting on the files just added

Four files went in unformatted: I ran the formatter mid-change and then
kept editing. ktfmtCheck is part of finishing, not part of starting.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app/androidApp/src/main/kotlin/com/example/aiapp/Events.kt

@@ -29,8 +29,7 @@ sealed class SessionEvent {
         val options: List<String>,
         /** The tool call this is permission for, or null when it is not about one. */
         val about: String?,
-    ) :
-        SessionEvent()
+    ) : SessionEvent()
 
     data class Answered(val id: String, val answer: String) : SessionEvent()