feat(mpp-idea): use DialogWrapper for IdeaMcpConfigDialog to center in IDE

- Create IdeaMcpConfigDialogWrapper using IntelliJ's DialogWrapper
- Dialog now appears centered in the IDE window like IdeaModelConfigDialog
- Proper z-index handling when used with SwingPanel components
- Update IdeaBottomToolbar to use IdeaMcpConfigDialogWrapper.show()
- Mark old IdeaMcpConfigDialog as deprecated

Author: phodal

mpp-idea/src/main/kotlin/cc/unitmesh/devins/idea/editor/IdeaBottomToolbar.kt

@@ -42,7 +42,6 @@ fun IdeaBottomToolbar(
     onConfigureClick: () -> Unit = {},
     modifier: Modifier = Modifier
 ) {
-    var showMcpConfigDialog by remember { mutableStateOf(false) }
     Row(
         modifier = modifier
             .fillMaxWidth()
@@ -81,9 +80,9 @@ fun IdeaBottomToolbar(
             horizontalArrangement = Arrangement.spacedBy(4.dp),
             verticalAlignment = Alignment.CenterVertically
         ) {
-            // MCP Config button - opens MCP configuration dialog
+            // MCP Config button - opens MCP configuration dialog using DialogWrapper
             IconButton(
-                onClick = { showMcpConfigDialog = true },
+                onClick = { IdeaMcpConfigDialogWrapper.show(project) },
                 modifier = Modifier.size(32.dp)
             ) {
                 Icon(
@@ -162,12 +161,5 @@ fun IdeaBottomToolbar(
             }
         }
     }
-
-    // MCP Configuration Dialog
-    if (showMcpConfigDialog) {
-        IdeaMcpConfigDialog(
-            onDismiss = { showMcpConfigDialog = false }
-        )
-    }
 }
 

mpp-idea/src/main/kotlin/cc/unitmesh/devins/idea/editor/IdeaMcpConfigDialog.kt

@@ -24,6 +24,9 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.window.Dialog
 import androidx.compose.ui.window.DialogProperties
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.ui.DialogWrapper
+import com.intellij.util.ui.JBUI
 import kotlinx.coroutines.flow.distinctUntilChanged
 import cc.unitmesh.agent.config.McpLoadingState
 import cc.unitmesh.agent.config.McpLoadingStateCallback
@@ -37,8 +40,11 @@ import cc.unitmesh.devins.ui.config.ConfigManager
 import kotlinx.coroutines.launch
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
+import org.jetbrains.jewel.bridge.compose
 import org.jetbrains.jewel.foundation.theme.JewelTheme
 import org.jetbrains.jewel.ui.component.*
+import java.awt.Dimension
+import javax.swing.JComponent
 
 // JSON serialization helpers
 private val json = Json {
@@ -63,6 +69,43 @@ private fun deserializeMcpConfig(jsonString: String): Result<Map<String, McpServ
     }
 }
 
+/**
+ * DialogWrapper for MCP configuration that uses IntelliJ's native dialog system.
+ * This ensures proper z-index handling and centers the dialog in the IDE window.
+ */
+class IdeaMcpConfigDialogWrapper(
+    private val project: Project?
+) : DialogWrapper(project) {
+
+    init {
+        title = "MCP Configuration"
+        init()
+        contentPanel.border = JBUI.Borders.empty()
+        rootPane.border = JBUI.Borders.empty()
+    }
+
+    override fun createSouthPanel(): JComponent? = null
+
+    override fun createCenterPanel(): JComponent {
+        val dialogPanel = compose {
+            IdeaMcpConfigDialogContent(onDismiss = { close(CANCEL_EXIT_CODE) })
+        }
+        dialogPanel.preferredSize = Dimension(600, 600)
+        return dialogPanel
+    }
+
+    companion object {
+        /**
+         * Show the MCP configuration dialog.
+         * @return true if the dialog was closed with OK, false otherwise
+         */
+        fun show(project: Project?): Boolean {
+            val dialog = IdeaMcpConfigDialogWrapper(project)
+            return dialog.showAndGet()
+        }
+    }
+}
+
 /**
  * MCP Configuration Dialog for IntelliJ IDEA.
  *
@@ -73,6 +116,8 @@ private fun deserializeMcpConfig(jsonString: String): Result<Map<String, McpServ
  * - Incremental MCP server loading
  *
  * Styled to match IdeaModelConfigDialog for consistency.
+ *
+ * @deprecated Use IdeaMcpConfigDialogWrapper.show() instead for proper z-index handling with SwingPanel.
  */
 @Composable
 fun IdeaMcpConfigDialog(