Fix: navigation bar 투명 처리 및 contrast 비활성화

- enableEdgeToEdge의 navigationBarStyle을 투명하게 설정
- Android Q 이상 버전에서 isNavigationBarContrastEnforced를 false로 설정하여 navigation bar의 contrast를 비활성화

Author: wjdrjs00

app/src/main/java/com/threegap/bitnagil/MainActivity.kt

@@ -1,5 +1,7 @@
 package com.threegap.bitnagil
 
+import android.graphics.Color
+import android.os.Build
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.SystemBarStyle
@@ -14,11 +16,18 @@ class MainActivity : ComponentActivity() {
         super.onCreate(savedInstanceState)
         enableEdgeToEdge(
             statusBarStyle = SystemBarStyle.light(
-                scrim = android.graphics.Color.TRANSPARENT,
-                darkScrim = android.graphics.Color.TRANSPARENT,
+                scrim = Color.TRANSPARENT,
+                darkScrim = Color.TRANSPARENT,
+            ),
+            navigationBarStyle = SystemBarStyle.light(
+                scrim = Color.TRANSPARENT,
+                darkScrim = Color.TRANSPARENT,
             ),
         )
         setContent {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                window.isNavigationBarContrastEnforced = false
+            }
             val mainNavigator = rememberMainNavigator()
             BitnagilTheme {
                 MainScreen(

app/src/main/java/com/threegap/bitnagil/MainScreen.kt

@@ -1,9 +1,11 @@
 package com.threegap.bitnagil
 
 import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.WindowInsetsSides
 import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.navigationBars
+import androidx.compose.foundation.layout.only
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.systemBars
 import androidx.compose.material3.Scaffold
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
@@ -16,7 +18,7 @@ fun MainScreen(
 ) {
     Scaffold(
         modifier = modifier.fillMaxSize(),
-        contentWindowInsets = WindowInsets.navigationBars,
+        contentWindowInsets = WindowInsets.systemBars.only(WindowInsetsSides.Bottom),
         containerColor = BitnagilTheme.colors.white,
     ) { innerPadding ->
         MainNavHost(