test: navigation routing test for drawer and page routing (Closes #34)

Add NavigationRoutingTest with 3 tests: menu button opens drawer with
nav items visible, clicking Settings navigates to settings page, and
navigating back restores the character sheet. Requires JVM Compose
test runner.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sharedUI/src/commonTest/kotlin/org/shahondin1624/NavigationRoutingTest.kt

@@ -0,0 +1,78 @@
+package org.shahondin1624
+
+import androidx.compose.ui.test.ExperimentalTestApi
+import androidx.compose.ui.test.assertIsDisplayed
+import androidx.compose.ui.test.onNodeWithTag
+import androidx.compose.ui.test.onNodeWithText
+import androidx.compose.ui.test.performClick
+import androidx.compose.ui.test.runComposeUiTest
+import org.shahondin1624.lib.components.TestTags
+import kotlin.test.Test
+
+/**
+ * Tests for navigation routing: drawer opens, items visible, and routing works.
+ * These tests render the full App composable in compact mode (default).
+ */
+@OptIn(ExperimentalTestApi::class)
+class NavigationRoutingTest {
+
+    @Test
+    fun menuButtonOpensDrawerWithNavItems() = runComposeUiTest {
+        setContent {
+            App()
+        }
+
+        waitForIdle()
+
+        // Click the menu button to open the drawer
+        onNodeWithTag(TestTags.MENU_BUTTON).performClick()
+        waitForIdle()
+
+        // Assert both navigation items are visible
+        onNodeWithText("Character Sheet").assertIsDisplayed()
+        onNodeWithText("Settings").assertIsDisplayed()
+    }
+
+    @Test
+    fun clickSettingsNavigatesToSettingsPage() = runComposeUiTest {
+        setContent {
+            App()
+        }
+
+        waitForIdle()
+
+        // Open drawer and click Settings
+        onNodeWithTag(TestTags.MENU_BUTTON).performClick()
+        waitForIdle()
+
+        onNodeWithTag(TestTags.NAV_SETTINGS).performClick()
+        waitForIdle()
+
+        // Assert Settings page content appears
+        onNodeWithTag("settings_page").assertIsDisplayed()
+    }
+
+    @Test
+    fun navigateBackToCharacterSheet() = runComposeUiTest {
+        setContent {
+            App()
+        }
+
+        waitForIdle()
+
+        // Navigate to Settings
+        onNodeWithTag(TestTags.MENU_BUTTON).performClick()
+        waitForIdle()
+        onNodeWithTag(TestTags.NAV_SETTINGS).performClick()
+        waitForIdle()
+
+        // Navigate back to Character Sheet
+        onNodeWithTag(TestTags.MENU_BUTTON).performClick()
+        waitForIdle()
+        onNodeWithTag(TestTags.NAV_CHARACTER_SHEET).performClick()
+        waitForIdle()
+
+        // Assert character sheet content reappears (attribute cards)
+        onNodeWithTag(TestTags.attributeCard("Body")).assertIsDisplayed()
+    }
+}