feat: add local dictation with Handy and Niri shortcuts

modules/capabilities/niri/_bindings.nix

@@ -1,5 +1,6 @@
 {
   browser,
+  handy,
   launcher,
   swapMonitorWorkspaces,
   terminal,
@@ -34,6 +35,24 @@ in
     _props.hotkey-overlay-title = "App Launcher";
   };
 
+  # Dictation
+  "Mod+D" = {
+    spawn = [
+      handy
+      "--toggle-transcription"
+    ];
+    _props.repeat = false;
+    _props.hotkey-overlay-title = "Toggle Dictation";
+  };
+  "Mod+Shift+D" = {
+    spawn = [
+      handy
+      "--cancel"
+    ];
+    _props.repeat = false;
+    _props.hotkey-overlay-title = "Cancel Dictation";
+  };
+
   # Hardware media, volume, and brightness keys
   "XF86AudioPlay" = spawnLocked "playerctl play-pause";
   "XF86AudioStop" = spawnLocked "playerctl stop";