Ribbon key tips: Alt shows codes on tabs, buttons and menu items

A lone Alt shows a code on every ribbon tab and quick-access button.
Typing a tab code opens the tab and shows the codes of its buttons,
dropdowns, slide-outs and collapsed panels; a button code runs it, a
dropdown or slide-out code opens it and shows its item codes, Esc goes
back one level. Codes follow the reference ribbon; buttons without a
reference counterpart get none and unnamed menu items are numbered.

Codes are drawn as accent pills over the widgets that reported their
bounds in the current frame, with a hint bar under the ribbon. While
the tips are open keys go to them only. The automation gets a keytips
action and read operation.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

locales/ru-RU/opencadstudio.ftl

@@ -6490,3 +6490,10 @@ ref-edit =
     .redefined = __ocs_fmt_0__ переопределен.
     .ok = Ок
     .nested = Вложенные
+
+keytips =
+    .title = KeyTip
+    .typed = Typed: { $path }
+    .hint-tabs = Type a tab letter · Esc closes
+    .hint-tab = { $tab } tab · Esc goes back one level
+    .hint-items = Type an item letter · Esc goes back one level