cleanup the new Compose UI a bit

app/src/main/java/com/geeksville/mesh/ui/Status.kt

@@ -0,0 +1,61 @@
+package com.geeksville.mesh.ui
+
+import androidx.compose.Model
+import androidx.compose.mutableStateOf
+import com.geeksville.mesh.MeshUser
+import com.geeksville.mesh.NodeInfo
+import com.geeksville.mesh.Position
+import java.util.*
+
+// defines the screens we have in the app
+sealed class Screen {
+    object Home : Screen()
+    // object Settings : Screen()
+}
+
+@Model
+object AppStatus {
+    var currentScreen: Screen = Screen.Home
+}
+
+data class TextMessage(val date: Date, val from: String, val text: String)
+
+/// FIXME - figure out how to merge this staate with the AppStatus Model
+object UIState {
+
+    private val testPositions = arrayOf(
+        Position(32.776665, -96.796989, 35), // dallas
+        Position(32.960758, -96.733521, 35), // richardson
+        Position(32.912901, -96.781776, 35) // north dallas
+    )
+
+    val testNodes = testPositions.mapIndexed { index, it ->
+        NodeInfo(
+            9 + index,
+            MeshUser("+65087653%02d".format(9 + index), "Kevin Mester$index", "KM$index"),
+            it,
+            12345
+        )
+    }
+
+    val testTexts = listOf(
+        TextMessage(Date(), "+6508675310", "I found the cache"),
+        TextMessage(Date(), "+6508675311", "Help! I've fallen and I can't get up.")
+    )
+
+    /// A map from nodeid to to nodeinfo
+    val nodes = mutableStateOf(testNodes.map { it.user!!.id to it }.toMap())
+
+    val messages = mutableStateOf(testTexts)
+
+    /// Are we connected to our radio device
+    var isConnected = mutableStateOf(false)
+
+}
+
+/**
+ * Temporary solution pending navigation support.
+ */
+fun navigateTo(destination: Screen) {
+    AppStatus.currentScreen = destination
+}