Refactor command handling, enhance tests, and improve discovery logic (#4878)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

feature/map/build.gradle.kts

@@ -45,16 +45,7 @@ kotlin {
             implementation(projects.core.di)
         }
 
-        androidMain.dependencies {
-            implementation(libs.androidx.datastore)
-            implementation(libs.androidx.datastore.preferences)
-            implementation(libs.androidx.lifecycle.runtime.ktx)
-            implementation(libs.androidx.lifecycle.viewmodel.ktx)
-            implementation(libs.androidx.navigation.common)
-            implementation(libs.androidx.savedstate.compose)
-            implementation(libs.androidx.savedstate.ktx)
-            implementation(libs.material)
-        }
+        androidMain.dependencies { implementation(libs.material) }
 
         androidUnitTest.dependencies {
             implementation(libs.junit)

feature/map/src/jvmMain/kotlin/org/meshtastic/feature/map/navigation/MapMainScreen.kt

@@ -16,25 +16,11 @@
  */
 package org.meshtastic.feature.map.navigation
 
-import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.runtime.Composable
+import org.meshtastic.core.ui.component.PlaceholderScreen
 
 @Composable
 actual fun MapMainScreen(onClickNodeChip: (Int) -> Unit, navigateToNodeDetails: (Int) -> Unit, waypointId: Int?) {
     // Desktop placeholder for now
-    org.meshtastic.feature.map.navigation.PlaceholderScreen(name = "Map")
-}
-
-@Composable
-internal fun PlaceholderScreen(name: String) {
-    androidx.compose.foundation.layout.Box(
-        modifier = androidx.compose.ui.Modifier.fillMaxSize(),
-        contentAlignment = androidx.compose.ui.Alignment.Center,
-    ) {
-        androidx.compose.material3.Text(
-            text = name,
-            style = androidx.compose.material3.MaterialTheme.typography.headlineMedium,
-            color = androidx.compose.material3.MaterialTheme.colorScheme.onSurfaceVariant,
-        )
-    }
+    PlaceholderScreen(name = "Map")
 }