feat: add hold-to-talk listener and restore Handy-managed preferences

modules/capabilities/niri/_bindings.nix

@@ -36,19 +36,23 @@ in
   };
 
   # Dictation
-  "Mod+Shift+D" = {
+  "Mod+D" = {
     spawn = [
-      handy
-      "--toggle-transcription"
+      "systemctl"
+      "--user"
+      "start"
+      "handy-ptt.service"
     ];
     _props.repeat = false;
+    _props.hotkey-overlay-title = "Hold to Dictate";
+  };
+  "Mod+Shift+D" = {
+    spawn-sh = "systemctl --user stop handy-ptt.service && ${handy} --toggle-transcription";
+    _props.repeat = false;
     _props.hotkey-overlay-title = "Toggle Dictation";
   };
   "Mod+Ctrl+D" = {
-    spawn = [
-      handy
-      "--cancel"
-    ];
+    spawn-sh = "systemctl --user stop handy-ptt.service && ${handy} --cancel";
     _props.repeat = false;
     _props.hotkey-overlay-title = "Cancel Dictation";
   };