refactor(splash): remove unused SplashScreen API dependency and theme

app/build.gradle.kts

@@ -94,7 +94,6 @@ android {
 dependencies {
     implementation(project(":core"))
 
-    implementation(libs.androidx.core.splashscreen)
     implementation(platform(libs.compose.bom))
     implementation(libs.androidx.activity.compose)
     implementation(libs.androidx.profileinstaller)

app/src/main/res/values-night/themes.xml

@@ -2,14 +2,6 @@
 <resources>
     <style name="Theme.YaYa" parent="@android:style/Theme.Material.NoActionBar" />
 
-    <!--
-        启动主题：用于 MAIN/LAUNCHER Activity。
-    -->
-    <style name="Theme.YaYa.Starting" parent="Theme.SplashScreen">
-        <item name="windowSplashScreenBackground">@color/splash_background</item>
-        <item name="postSplashScreenTheme">@style/Theme.YaYa</item>
-    </style>
-
     <style name="Theme.YaYa.Splash" parent="@android:style/Theme.Material.NoActionBar">
         <item name="android:windowBackground">@color/splash_background</item>
     </style>

app/src/main/res/values/themes.xml

@@ -2,17 +2,6 @@
 <resources>
     <style name="Theme.YaYa" parent="@android:style/Theme.Material.Light.NoActionBar" />
 
-    <!--
-        启动主题：用于 MAIN/LAUNCHER Activity。
-        继承 Theme.SplashScreen，保证 Android 12 以下也能获得一致的启动窗口行为。
-        windowSplashScreenBackground 使用 Material 3 静态基准色，作为动态颜色不可用时
-        的 fallback，以减少启动窗口与 Compose 首帧之间的色差闪烁。
-    -->
-    <style name="Theme.YaYa.Starting" parent="Theme.SplashScreen">
-        <item name="windowSplashScreenBackground">@color/splash_background</item>
-        <item name="postSplashScreenTheme">@style/Theme.YaYa</item>
-    </style>
-
     <style name="Theme.YaYa.Splash" parent="@android:style/Theme.Material.Light.NoActionBar">
         <item name="android:windowBackground">@color/splash_background</item>
     </style>