Review fixes: keep the keyboard off the settings form, and key the waits apart

The settings dialog was a dialog, so the platform moved it off the
keyboard; a screen is not, and the lower half of the form was under it.

A tool call registered its abandonable wait under the call's own id, which
the model chooses -- one named `generating` would have taken the turn's
entry and left the other wait with nobody to answer it.

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

@@ -8,6 +8,7 @@ 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.imePadding
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.rememberScrollState
@@ -300,7 +301,9 @@ fun SessionSettingsScreen(
     BackHandler(onBack = onDismiss)
     var tab by remember(sessionId) { mutableIntStateOf(0) }
     Surface(Modifier.fillMaxSize()) {
-        Column(Modifier.fillMaxSize()) {
+        // The keyboard covers the lower half of a form of fields, and this is a screen rather
+        // than a dialog now -- nothing else is going to move it out of the way.
+        Column(Modifier.fillMaxSize().imePadding()) {
             Row(
                 verticalAlignment = Alignment.CenterVertically,
                 modifier = Modifier.fillMaxWidth().padding(horizontal = 16.dp),