Move subagents into session side panel

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

@@ -48,8 +48,6 @@ fun MainScreen(
     /** What another app shared in and no session has taken yet; see [ShareRequest]. */
     share: ShareRequest? = null,
     onOpen: (SessionSummary) -> Unit,
-    /** Opens one session's subagent, from the expander under its card. */
-    onOpenSubagent: (SessionSummary, SubagentSummary) -> Unit,
     onSpawn: () -> Unit,
     onImported: (SessionSummary) -> Unit,
     onSettings: () -> Unit,
@@ -141,7 +139,6 @@ fun MainScreen(
                     settings = settings,
                     reloadToken = token,
                     onOpen = onOpen,
-                    onOpenSubagent = onOpenSubagent,
                     onSpawn = onSpawn,
                 )
             MainTab.Import ->