fix: welcome window UX polish (#450)

* fix: welcome window UX polish — Escape, focus, Cmd+A, Return hint, menu colors

* fix: restore checkmark indicator for current group in Move to Group menu

Author: datlechin

TablePro/Views/Connection/WelcomeWindowView.swift

@@ -115,6 +115,7 @@ struct WelcomeWindowView: View {
         .frame(minWidth: 650, minHeight: 400)
         .onAppear {
             loadConnections()
+            focus = .search
         }
         .confirmationDialog(
             connectionsToDelete.count == 1
@@ -241,6 +242,7 @@ struct WelcomeWindowView: View {
             // Footer hints
             HStack(spacing: 16) {
                 SyncStatusIndicator()
+                KeyboardHint(keys: "↵", label: "Connect")
                 KeyboardHint(keys: "⌘N", label: "New")
                 KeyboardHint(keys: "⌘,", label: "Settings")
             }
@@ -302,6 +304,13 @@ struct WelcomeWindowView: View {
                             connectSelectedConnections()
                             return .handled
                         }
+                        .onKeyPress(.escape) {
+                            if !searchText.isEmpty {
+                                searchText = ""
+                            }
+                            focus = .connectionList
+                            return .handled
+                        }
                         .onKeyPress(characters: .init(charactersIn: "\u{7F}\u{08}"), phases: .down) { keyPress in
                             guard keyPress.modifiers.contains(.command) else { return .ignored }
                             let toDelete = selectedConnections
@@ -418,6 +427,17 @@ struct WelcomeWindowView: View {
                 showDeleteConfirmation = true
                 return .handled
             }
+            .onKeyPress(characters: .init(charactersIn: "a"), phases: .down) { keyPress in
+                guard keyPress.modifiers.contains(.command) else { return .ignored }
+                selectedConnectionIds = Set(flatVisibleConnections.map(\.id))
+                return .handled
+            }
+            .onKeyPress(.escape) {
+                if !selectedConnectionIds.isEmpty {
+                    selectedConnectionIds = []
+                }
+                return .handled
+            }
             .onKeyPress(characters: .init(charactersIn: "jn"), phases: [.down, .repeat]) { keyPress in
                 guard keyPress.modifiers.contains(.control) else { return .ignored }
                 moveToNextConnection()
@@ -663,9 +683,8 @@ struct WelcomeWindowView: View {
                 } label: {
                     HStack {
                         if !group.color.isDefault {
-                            Circle()
-                                .fill(group.color.color)
-                                .frame(width: 8, height: 8)
+                            Image(systemName: "circle.fill")
+                                .foregroundStyle(group.color.color)
                         }
                         Text(group.name)
                         if currentGroupId == group.id {