build: remove browser configuration from core modules to fix JS plugin conflict

Eliminated `browser {}` blocks from core library modules to resolve "Plugin loaded multiple times" error in Kotlin/JS Gradle builds. Adjusted to support a cleaner, centralized JS target configuration. Documented the root cause and workaround in troubleshooting logs.

core/core-domain/build.gradle.kts

@@ -12,11 +12,7 @@ kotlin {
 
   js(IR) {
     binaries.library()
-    browser {
-      testTask {
-        enabled = false
-      }
-    }
+    // browser {} block removed to fix "Plugin loaded multiple times" error.
   }
 
   @OptIn(org.jetbrains.kotlin.gradle.ExperimentalWasmDsl::class)