feat(keyboard): add Notes skill and system-style typing

Add save-to-Notes export and direct map handoff while aligning multi-touch typing, period shortcuts, return actions, and navigation visuals with system behavior.

OSGKeyboardMac/MacDictationViewModel.swift

@@ -28,13 +28,14 @@ enum MacSection: String, CaseIterable, Identifiable {
         }
     }
 
-    var systemImage: String {
+    /// Outline when idle, fill when selected — except Home, which stays `house`.
+    func systemImage(selected: Bool) -> String {
         switch self {
         case .dashboard: return "house"
         case .history: return "clock.arrow.circlepath"
         case .dictionary: return "character.book.closed"
-        case .styles: return "text.badge.star"
-        case .settings: return "gearshape"
+        case .styles: return selected ? "dial.high.fill" : "dial.high"
+        case .settings: return selected ? "gearshape.fill" : "gearshape"
         }
     }
 }

OSGKeyboardMac/MacRootView.swift

@@ -123,7 +123,7 @@ private struct MacSidebarRow: View {
 
     var body: some View {
         Button(action: action) {
-            Label(section.title(language: language), systemImage: section.systemImage)
+            Label(section.title(language: language), systemImage: section.systemImage(selected: isSelected))
                 .font(.system(size: 13, weight: isSelected ? .semibold : .regular))
                 .foregroundStyle(isSelected ? palette.accent : palette.textPrimary)
                 .frame(maxWidth: .infinity, alignment: .leading)