refactor: native UndoManager responder chain integration

CHANGELOG.md

@@ -14,6 +14,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Removed the separate Copilot settings tab and the per-feature routing UI
 - Existing AI providers are preserved on upgrade; the first one is auto-set as active
 - Filter value field uses a native SwiftUI suggestion dropdown instead of the AppKit autocomplete popup
+- Undo/Redo routes through macOS responder chain, eliminating manual first-responder dispatch
+- Native macOS UI patterns: Picker(.menu) for cell editors, native alerts, native List selection, .navigationTitle for sheets, NSSearchField for welcome search, borderless toolbar buttons, chevron indicator on SET picker
+- Quit dialog defaults to Cancel on Return key
+- Connection form delete button moved to far left
+- SSH/SSL browse panels show descriptive message text
 
 ### Added
 

TablePro/Core/ChangeTracking/AnyChangeManager.swift

@@ -13,8 +13,8 @@ import Observation
 @Observable
 @MainActor
 final class AnyChangeManager {
-    @ObservationIgnored private var dataManager: DataChangeManager?
-    @ObservationIgnored private var structureManager: StructureChangeManager?
+    @ObservationIgnored private(set) var dataManager: DataChangeManager?
+    @ObservationIgnored private(set) var structureManager: StructureChangeManager?
 
     var hasChanges: Bool {
         dataManager?.hasChanges ?? structureManager?.hasChanges ?? false
@@ -44,7 +44,7 @@ final class AnyChangeManager {
             dataManager.changes
         }
         self._canRedo = {
-            dataManager.canRedo
+            dataManager.undoManager.canRedo
         }
         self._recordCellChange = { rowIndex, columnIndex, columnName, oldValue, newValue, originalRow in
             dataManager.recordCellChange(
@@ -75,7 +75,7 @@ final class AnyChangeManager {
             Array(structureManager.pendingChanges.values)
         }
         self._canRedo = {
-            structureManager.canRedo
+            structureManager.undoManager.canRedo
         }
         self._recordCellChange = nil // Structure uses custom editing logic
         self._undoRowDeletion = nil
@@ -87,6 +87,12 @@ final class AnyChangeManager {
 
     // MARK: - Public API
 
+    var undoManager: UndoManager? {
+        if let dataManager { return dataManager.undoManager }
+        if let structureManager { return structureManager.undoManager }
+        return nil
+    }
+
     var canRedo: Bool {
         _canRedo()
     }

TablePro/Core/ChangeTracking/DataChangeModels.swift

@@ -68,25 +68,6 @@ struct RowChangeKey: Hashable {
     let type: ChangeType
 }
 
-/// Represents an action that can be undone
-enum UndoAction {
-    case cellEdit(
-            rowIndex: Int,
-            columnIndex: Int,
-            columnName: String,
-            previousValue: String?,
-            newValue: String?
-         )
-    case rowInsertion(rowIndex: Int)
-    case rowDeletion(rowIndex: Int, originalRow: [String?])
-    /// Batch deletion of multiple rows (for undo as a single action)
-    case batchRowDeletion(rows: [(rowIndex: Int, originalRow: [String?])])
-    /// Batch insertion undo - when user deletes multiple inserted rows at once
-    case batchRowInsertion(rowIndices: [Int], rowValues: [[String?]])
-}
-
-// Note: TabPendingChanges is defined in QueryTab.swift
-
 // MARK: - Array Extension
 
 extension Array {

TablePro/Core/SchemaTracking/StructureChangeManager.swift

@@ -38,7 +38,7 @@ final class StructureChangeManager {
 
     // MARK: - Undo/Redo Support
 
-    private let undoManager: UndoManager = {
+    let undoManager: UndoManager = {
         let manager = UndoManager()
         manager.levelsOfUndo = 100
         return manager

TablePro/Core/Services/Infrastructure/MainSplitViewController.swift

@@ -365,7 +365,6 @@ internal final class MainSplitViewController: NSSplitViewController, InspectorVi
                 tableOperationOptions: sessionTableOperationOptionsBinding,
                 rightPanelState: rightPanelState,
                 tabManager: sessionState.tabManager,
-                changeManager: sessionState.changeManager,
                 filterStateManager: sessionState.filterStateManager,
                 toolbarState: sessionState.toolbarState,
                 coordinator: sessionState.coordinator

TablePro/Core/Services/Infrastructure/SessionStateFactory.swift

@@ -12,7 +12,6 @@ import Foundation
 enum SessionStateFactory {
     struct SessionState {
         let tabManager: QueryTabManager
-        let changeManager: DataChangeManager
         let filterStateManager: FilterStateManager
         let columnVisibilityManager: ColumnVisibilityManager
         let toolbarState: ConnectionToolbarState
@@ -44,8 +43,6 @@ enum SessionStateFactory {
         payload: EditorTabPayload?
     ) -> SessionState {
         let tabMgr = QueryTabManager()
-        let changeMgr = DataChangeManager()
-        changeMgr.databaseType = connection.type
         let filterMgr = FilterStateManager()
         let colVisMgr = ColumnVisibilityManager()
         let toolbarSt = ConnectionToolbarState(connection: connection)
@@ -138,15 +135,13 @@ enum SessionStateFactory {
         let coord = MainContentCoordinator(
             connection: connection,
             tabManager: tabMgr,
-            changeManager: changeMgr,
             filterStateManager: filterMgr,
             columnVisibilityManager: colVisMgr,
             toolbarState: toolbarSt
         )
 
         return SessionState(
             tabManager: tabMgr,
-            changeManager: changeMgr,
             filterStateManager: filterMgr,
             columnVisibilityManager: colVisMgr,
             toolbarState: toolbarSt,