feat(android): establish Jetpack Compose foundation with navigation and shared theme

- Set up project namespace to com.shieldai.android
- Add navigation-compose dependency
- Create ShieldAI brand color palette (Color.kt) with light/dark tokens
- Add Material3 Typography scale (Type.kt) with all text styles
- Create Shape.kt with small/medium/large rounded corners
- Implement ShieldAITheme with light/dark color schemes and optional dynamic color
- Define Screen sealed class with all destinations (Dashboard, Services, Alerts, Settings, Account, Login, Signup, Onboarding, ServiceDetail)
- Create NavGraph with composable routes and placeholder screens
- Implement BottomNavBar with 5 navigation items with icons
- Create AppNavigation with Scaffold, NavHost, and bottom nav visibility logic
- Add ShieldAIApp Application class and updated MainActivity
- Create vector drawables for bottom nav icons
- Add test files under new package
- Remove old template package (com.mikefreno.shieldai)

android/ShieldAI/app/build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
 }
 
 android {
-    namespace = "com.mikefreno.shieldai"
+    namespace = "com.shieldai.android"
     compileSdk {
         version = release(36) {
             minorApiLevel = 1
@@ -12,7 +12,7 @@ android {
     }
 
     defaultConfig {
-        applicationId = "com.mikefreno.shieldai"
+        applicationId = "com.shieldai.android"
         minSdk = 26
         targetSdk = 36
         versionCode = 1
@@ -43,6 +43,7 @@ dependencies {
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.lifecycle.runtime.ktx)
     implementation(libs.androidx.activity.compose)
+    implementation(libs.androidx.navigation.compose)
     implementation(platform(libs.androidx.compose.bom))
     implementation(libs.androidx.compose.ui)
     implementation(libs.androidx.compose.ui.graphics)
@@ -56,4 +57,4 @@ dependencies {
     androidTestImplementation(libs.androidx.compose.ui.test.junit4)
     debugImplementation(libs.androidx.compose.ui.tooling)
     debugImplementation(libs.androidx.compose.ui.test.manifest)
-}
+}