Wear snippets: navigation and migration page (#726)

* More snippets: navigation and migration page

* Apply Spotless

---------

Co-authored-by: kul3r4 <[email protected]>

Author: kul3r4

wear/src/main/java/com/example/wear/snippets/m3/navigation/Navigation.kt

@@ -38,6 +38,26 @@ import com.example.wear.R
 import com.google.android.horologist.compose.layout.ColumnItemType
 import com.google.android.horologist.compose.layout.rememberResponsiveColumnPadding
 
+@Composable
+fun navController() {
+    // [START android_wear_nav_controller]
+    val navController = rememberSwipeDismissableNavController()
+    // [END android_wear_nav_controller]
+}
+
+@Composable
+fun navHost() {
+    // [START android_wear_nav_host]
+    val navController = rememberSwipeDismissableNavController()
+    SwipeDismissableNavHost(
+        navController = navController,
+        startDestination = "message_list"
+    ) {
+        // TODO: build navigation graph
+    }
+    // [END android_wear_nav_host]
+}
+
 @Composable
 fun navigation() {
     // [START android_wear_navigation]

wear/src/main/java/com/example/wear/snippets/m3/theme/Color.kt

@@ -31,3 +31,11 @@ fun myApp() {
 
 internal val myBrandColors: ColorScheme = ColorScheme( /* Specify colors here */)
 // [END android_wear_dynamic_theme]]
+
+fun color() {
+    // [START android_wear_color]
+    val appColorScheme: ColorScheme = ColorScheme(
+        // M3 ColorScheme parameters
+    )
+    // [END android_wear_color]
+}

wear/src/main/java/com/example/wear/snippets/m3/theme/Theme.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.wear.snippets.m3.theme
+
+import androidx.compose.runtime.Composable
+import androidx.wear.compose.material3.ColorScheme
+import androidx.wear.compose.material3.MaterialTheme
+import androidx.wear.compose.material3.MotionScheme
+import androidx.wear.compose.material3.Shapes
+import androidx.wear.compose.material3.Typography
+
+@Composable
+fun materialTheme() {
+    val appColorScheme = ColorScheme()
+    val appTypography = Typography()
+    val appShapes = Shapes()
+    val appMotionScheme = MotionScheme.standard()
+    // [START android_wear_material_theme]
+    MaterialTheme(
+        colorScheme = appColorScheme,
+        typography = appTypography,
+        shapes = appShapes,
+        motionScheme = appMotionScheme,
+        content = { /*content here*/ }
+    )
+    // [END android_wear_material_theme]
+}