refactor: split ConnectionFormView into SSH, SSL, and Advanced subviews (#536)

* refactor: split ConnectionFormView into SSH, SSL, and Advanced subviews

* fix: address review — remove duplicated resolvedSSHAgentSocketPath, fix testConnection SSH profile lookup

Author: datlechin

TablePro/Views/Connection/ConnectionAdvancedView.swift

@@ -0,0 +1,152 @@
+//
+//  ConnectionAdvancedView.swift
+//  TablePro
+//
+//  Created by Ngo Quoc Dat on 31/3/26.
+//
+
+import SwiftUI
+import TableProPluginKit
+
+struct ConnectionAdvancedView: View {
+    @Binding var additionalFieldValues: [String: String]
+    @Binding var startupCommands: String
+    @Binding var preConnectScript: String
+    @Binding var aiPolicy: AIConnectionPolicy?
+
+    let databaseType: DatabaseType
+    let additionalConnectionFields: [ConnectionField]
+
+    var body: some View {
+        Form {
+            let advancedFields = additionalConnectionFields.filter { $0.section == .advanced }
+            if !advancedFields.isEmpty {
+                Section(databaseType.displayName) {
+                    ForEach(advancedFields, id: \.id) { field in
+                        if isFieldVisible(field) {
+                            ConnectionFieldRow(
+                                field: field,
+                                value: Binding(
+                                    get: {
+                                        additionalFieldValues[field.id]
+                                            ?? field.defaultValue ?? ""
+                                    },
+                                    set: { additionalFieldValues[field.id] = $0 }
+                                )
+                            )
+                        }
+                    }
+                }
+            }
+
+            Section(String(localized: "Startup Commands")) {
+                StartupCommandsEditor(text: $startupCommands)
+                    .frame(height: 80)
+                    .background(Color(nsColor: .textBackgroundColor))
+                    .clipShape(RoundedRectangle(cornerRadius: 5))
+                    .overlay(
+                        RoundedRectangle(cornerRadius: 5)
+                            .stroke(Color(nsColor: .separatorColor), lineWidth: 1)
+                    )
+                Text(
+                    "SQL commands to run after connecting, e.g. SET time_zone = 'Asia/Ho_Chi_Minh'. One per line or separated by semicolons."
+                )
+                .font(.caption)
+                .foregroundStyle(.secondary)
+            }
+
+            Section(String(localized: "Pre-Connect Script")) {
+                StartupCommandsEditor(text: $preConnectScript)
+                    .frame(height: 80)
+                    .background(Color(nsColor: .textBackgroundColor))
+                    .clipShape(RoundedRectangle(cornerRadius: 5))
+                    .overlay(
+                        RoundedRectangle(cornerRadius: 5)
+                            .stroke(Color(nsColor: .separatorColor), lineWidth: 1)
+                    )
+                Text(
+                    "Shell script to run before connecting. Non-zero exit aborts connection."
+                )
+                .font(.caption)
+                .foregroundStyle(.secondary)
+            }
+
+            if AppSettingsManager.shared.ai.enabled {
+                Section(String(localized: "AI")) {
+                    Picker(String(localized: "AI Policy"), selection: $aiPolicy) {
+                        Text(String(localized: "Use Default"))
+                            .tag(AIConnectionPolicy?.none as AIConnectionPolicy?)
+                        ForEach(AIConnectionPolicy.allCases) { policy in
+                            Text(policy.displayName)
+                                .tag(AIConnectionPolicy?.some(policy) as AIConnectionPolicy?)
+                        }
+                    }
+                }
+            }
+        }
+        .formStyle(.grouped)
+        .scrollContentBackground(.hidden)
+    }
+
+    private func isFieldVisible(_ field: ConnectionField) -> Bool {
+        guard let rule = field.visibleWhen else { return true }
+        let currentValue = additionalFieldValues[rule.fieldId] ?? defaultFieldValue(rule.fieldId)
+        return rule.values.contains(currentValue)
+    }
+
+    private func defaultFieldValue(_ fieldId: String) -> String {
+        additionalConnectionFields.first { $0.id == fieldId }?.defaultValue ?? ""
+    }
+}
+
+// MARK: - Startup Commands Editor
+
+struct StartupCommandsEditor: NSViewRepresentable {
+    @Binding var text: String
+
+    func makeNSView(context: Context) -> NSScrollView {
+        let scrollView = NSTextView.scrollableTextView()
+        guard let textView = scrollView.documentView as? NSTextView else { return scrollView }
+
+        textView.font = .monospacedSystemFont(ofSize: NSFont.systemFontSize, weight: .regular)
+        textView.isAutomaticQuoteSubstitutionEnabled = false
+        textView.isAutomaticDashSubstitutionEnabled = false
+        textView.isAutomaticTextReplacementEnabled = false
+        textView.isAutomaticSpellingCorrectionEnabled = false
+        textView.isRichText = false
+        textView.string = text
+        textView.textContainerInset = NSSize(width: 2, height: 6)
+        textView.drawsBackground = false
+        textView.delegate = context.coordinator
+
+        scrollView.borderType = .noBorder
+        scrollView.hasVerticalScroller = true
+        scrollView.drawsBackground = false
+
+        return scrollView
+    }
+
+    func updateNSView(_ scrollView: NSScrollView, context: Context) {
+        guard let textView = scrollView.documentView as? NSTextView else { return }
+        if textView.string != text {
+            textView.string = text
+        }
+    }
+
+    func makeCoordinator() -> Coordinator {
+        Coordinator(text: $text)
+    }
+
+    final class Coordinator: NSObject, NSTextViewDelegate {
+        private var text: Binding<String>
+
+        init(text: Binding<String>) {
+            self.text = text
+        }
+
+        func textDidChange(_ notification: Notification) {
+            guard let textView = notification.object as? NSTextView else { return }
+            text.wrappedValue = textView.string
+        }
+    }
+}