Feat: 전역 토스트 구현

- 전역에서 사용할 수 있는 BitnagilToast 를 관리하는 GlobalBitnagilToast 싱글톤 객체 추가
- MainActivity에 BitnagilToastContainer 추가

Author: wjdrjs00

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

@@ -4,7 +4,16 @@ import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
-import com.threegap.bitnagil.designsystem.BitnagilTheme
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import com.threegap.bitnagil.designsystem.component.atom.BitnagilToastContainer
+import com.threegap.bitnagil.designsystem.component.atom.rememberBitnagilToast
+import com.threegap.bitnagil.presentation.common.toast.GlobalBitnagilToast
 import dagger.hilt.android.AndroidEntryPoint
 
 @AndroidEntryPoint
@@ -14,10 +23,23 @@ class MainActivity : ComponentActivity() {
         enableEdgeToEdge()
         setContent {
             val mainNavigator = rememberMainNavigator()
-            BitnagilTheme {
+            val globalToast = rememberBitnagilToast()
+
+            LaunchedEffect(globalToast) {
+                GlobalBitnagilToast.initialize(globalToast)
+            }
+
+            Box(modifier = Modifier.fillMaxSize()) {
                 MainScreen(
                     navigator = mainNavigator,
                 )
+
+                BitnagilToastContainer(
+                    state = globalToast,
+                    modifier = Modifier
+                        .align(Alignment.BottomCenter)
+                        .padding(bottom = 100.dp),
+                )
             }
         }
     }

presentation/src/main/java/com/threegap/bitnagil/presentation/common/toast/GlobalBitnagilToast.kt

@@ -0,0 +1,21 @@
+package com.threegap.bitnagil.presentation.common.toast
+
+import com.threegap.bitnagil.designsystem.R
+import com.threegap.bitnagil.designsystem.component.atom.BitnagilToastState
+import java.lang.ref.WeakReference
+
+object GlobalBitnagilToast {
+    private var _toastStateRef: WeakReference<BitnagilToastState>? = null
+
+    fun initialize(toastState: BitnagilToastState) {
+        _toastStateRef = WeakReference(toastState)
+    }
+
+    fun show(text: String, icon: Int? = null) {
+        _toastStateRef?.get()?.show(text, icon)
+    }
+
+    fun showCheck(text: String) = show(text, R.drawable.ic_check)
+
+    fun showWarning(text: String) = show(text, R.drawable.ic_warning)
+}