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/state/useRemount.ts

@@ -0,0 +1,15 @@
+// Lets a view ask App to remount the current route's component in place:
+// App keys the routed view by path plus this revision, so bumping it gives
+// the view a fresh instance without a navigation (Create and new on a
+// create form opens a blank form at the same path).
+import { readonly, ref } from 'vue'
+
+const revision = ref(0)
+
+/** Part of App's routed view key; bumped by remountView. */
+export const remountRevision = readonly(revision)
+
+/** Remounts the current route's view. */
+export function remountView(): void {
+  revision.value++
+}