refactor/#15: isSubmitEnabled를 derivedStateOf로 변경하여 불필요한 리컴포지션 방지

Author: DongChyeon

feature/upload/src/main/java/com/sseotdabwa/buyornot/feature/upload/ui/UploadScreen.kt

@@ -34,6 +34,7 @@ import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -110,8 +111,13 @@ fun UploadScreen(
             selectedImageUri = uri
         }
 
-    val isSubmitEnabled = selectedCategory != null && priceRaw.isNotEmpty() && selectedImageUri != null
-
+    val isSubmitEnabled by remember {
+        derivedStateOf {
+            selectedCategory != null &&
+                    priceRaw.isNotEmpty() &&
+                    selectedImageUri != null
+        }
+    }
     BackHandler {
         if (!showExitDialog) showExitDialog = true
     }