feat(quick-261022-k9k): admin save shortcuts and Create and new on record forms

- app/hotkeys.ts: dependency-free data-hotkey core (Ctrl/Cmd+S, Ctrl/Cmd+Enter,
  Ctrl/Cmd+Shift+S, Esc, / and ?), innermost-modal root, capture-phase modifier
  listener, platform labels and the help-dialog state
- Button hotkey prop (data-hotkey, aria-keyshortcuts); shortcuts installed by AppShell
- FormView: save keys and tooltips, Create and new on create forms via remountView
- phrasebook: form.create_and_new and the shortcuts group (en, pl)

admin/src/components/shell/AppShell.vue

@@ -13,19 +13,27 @@ import { activeEntry } from '../../state/useNavigation'
 import { settingsEntry, settingsLinkFor, settingsSectionOf } from '../../state/useSettings'
 import { useSidebar } from '../../state/useSidebar'
 import { t } from '../../app/i18n'
+import { closeShortcutHelp, installHotkeys } from '../../app/hotkeys'
 
 // Navigation shell (design: Navigation shell and Top header; D-06, D-10):
 // the plugin rail, the section panel (the active plugin's side menu or, on a
 // settings page, the settings panel of its category; hidden when the
 // sidebar is collapsed by the viewport or by the admin), and the 64px header
 // with breadcrumbs and the user menu. The toast queue is mounted here so
-// toasts survive navigation.
+// toasts survive navigation. The keyboard shortcuts (app/hotkeys.ts) are
+// installed here, so only signed-in shell screens answer them.
 const route = useRoute()
 const { collapsed, watchViewport } = useSidebar()
 
 const stopViewport = watchViewport()
 onBeforeUnmount(stopViewport)
 
+const uninstallHotkeys = installHotkeys()
+onBeforeUnmount(() => {
+  uninstallHotkeys()
+  closeShortcutHelp()
+})
+
 // "View site" (WinterCMS parity) opens the public site in a new tab: the
 // admin page's own origin, without the admin path prefix.
 const siteURL = `${window.location.origin}/`