feat: Integrate AlertHost into desktop application and add UI tests (#4893)

core/ui/src/androidTest/kotlin/org/meshtastic/core/ui/component/AlertHostTest.kt

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2026 Meshtastic LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.meshtastic.core.ui.component
+
+import androidx.compose.ui.test.assertIsDisplayed
+import androidx.compose.ui.test.junit4.createComposeRule
+import androidx.compose.ui.test.onNodeWithText
+import org.junit.Rule
+import org.junit.Test
+import org.meshtastic.core.ui.util.AlertManager
+
+class AlertHostTest {
+
+    @get:Rule val composeTestRule = createComposeRule()
+
+    @Test
+    fun alertHost_showsDialog_whenAlertIsTriggered() {
+        val alertManager = AlertManager()
+        val title = "Alert Title"
+        val message = "Alert Message"
+
+        composeTestRule.setContent { AlertHost(alertManager = alertManager) }
+
+        alertManager.showAlert(title = title, message = message)
+
+        composeTestRule.onNodeWithText(title).assertIsDisplayed()
+        composeTestRule.onNodeWithText(message).assertIsDisplayed()
+    }
+}