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/ui/Button.vue

@@ -1,9 +1,12 @@
 <script setup lang="ts">
 import { computed, type Component } from 'vue'
 import { RouterLink, type RouteLocationRaw } from 'vue-router'
+import { ariaKeyshortcuts } from '../../app/hotkeys'
 
 // One button for the whole admin (design tokens): primary, outline, ghost and
 // danger (outline). With `to` it renders a router link styled the same way.
+// A hotkey prop marks the button for the admin's keyboard shortcuts
+// (data-hotkey tokens, see app/hotkeys.ts).
 const props = withDefaults(
   defineProps<{
     variant?: 'primary' | 'outline' | 'ghost' | 'danger'
@@ -12,8 +15,9 @@ const props = withDefaults(
     disabled?: boolean
     icon?: Component
     to?: RouteLocationRaw
+    hotkey?: string
   }>(),
-  { variant: 'outline', size: 'md', type: 'button', disabled: false, icon: undefined, to: undefined },
+  { variant: 'outline', size: 'md', type: 'button', disabled: false, icon: undefined, to: undefined, hotkey: undefined },
 )
 
 const variants: Record<NonNullable<typeof props.variant>, string> = {
@@ -23,6 +27,8 @@ const variants: Record<NonNullable<typeof props.variant>, string> = {
   danger: 'border border-danger bg-surface text-danger hover:bg-danger-soft',
 }
 
+const keyshortcuts = computed(() => (props.hotkey ? ariaKeyshortcuts(props.hotkey) : undefined))
+
 const classes = computed(() => [
   'inline-flex shrink-0 items-center justify-center gap-2 rounded-control px-4 font-semibold whitespace-nowrap no-underline transition-colors duration-150 ease-out disabled:cursor-not-allowed disabled:opacity-60',
   props.size === 'sm' ? 'h-[38px]' : 'h-button',
@@ -31,11 +37,24 @@ const classes = computed(() => [
 </script>
 
 <template>
-  <RouterLink v-if="to !== undefined" :to="to" :class="classes">
+  <RouterLink
+    v-if="to !== undefined"
+    :to="to"
+    :class="classes"
+    :data-hotkey="hotkey"
+    :aria-keyshortcuts="keyshortcuts"
+  >
     <component :is="icon" v-if="icon" :size="16" aria-hidden="true" />
     <slot />
   </RouterLink>
-  <button v-else :type="type" :disabled="disabled" :class="classes">
+  <button
+    v-else
+    :type="type"
+    :disabled="disabled"
+    :class="classes"
+    :data-hotkey="hotkey"
+    :aria-keyshortcuts="keyshortcuts"
+  >
     <component :is="icon" v-if="icon" :size="16" aria-hidden="true" />
     <slot />
   </button>