fix(ui): add keyboard shortcut hints toggle

Hide shortcut hints in WebUI and allow toggling in native desktop apps.

packages/ui/src/styles/utilities.css

@@ -153,6 +153,19 @@
   @apply opacity-50;
 }
 
+/*
+  Shortcut hints are useful on desktop native apps, but are noisy/irrelevant on
+  touch-first devices and in WebUI where browser shortcuts often conflict.
+*/
+html[data-runtime-host="web"] .keyboard-hints,
+html[data-runtime-host="web"] .kbd-hint,
+html[data-runtime-platform="mobile"] .keyboard-hints,
+html[data-runtime-platform="mobile"] .kbd-hint,
+html[data-keyboard-hints="hide"] .keyboard-hints,
+html[data-keyboard-hints="hide"] .kbd-hint {
+  display: none !important;
+}
+
 /* Truncate from the start (keeps end visible; good for paths) */
 .truncate-start {
   overflow: hidden;