fix: suppress microphone activity indications and document dictation diagnosis

modules/capabilities/noctalia.nix

@@ -87,6 +87,8 @@
           shell = {
             font_family = "Lexend";
             polkit_agent = true;
+            # Handy provides recording feedback; omit microphone activity popups/indicators.
+            privacy.mic_filter_regex = ".*";
             screen_time_enabled = true;
             animation.speed = 1.5;
             screen_corners = {