feat(date) : anneau focus clavier et ouverture clavier sur CalendarField

Couvre toute la famille date (Date, DateRange, DateTime, DateWeek) :
- Anneau de focus clavier (clavier-only) ; ouvert, l'anneau entoure
  champ + calendrier d'un seul tenant (combo)
- Entrée / Espace ouvrent/ferment le calendrier (mode non éditable),
  Échap ferme ; mode éditable inchangé
- Anneau sur la croix d'effacement

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/components/malio/date/internal/CalendarField.vue

@@ -23,10 +23,10 @@
         placeholder="_"
         type="text"
         @click="onFieldClick"
-        @focus="onFocus"
+        @focus="onFocus(); onKbdFocus()"
         @input="onInput"
-        @blur="onBlur"
+        @blur="onBlur(); onKbdBlur()"
-        @keydown.enter.prevent="onEnter"
+        @keydown="onKeydown"
       >
 
       <label
@@ -42,7 +42,7 @@
           v-if="showClear"
           type="button"
           data-test="clear"
-          class="text-m-muted hover:text-m-primary"
+          class="m-focus-ring rounded-malio text-m-muted hover:text-m-primary"
           aria-label="Effacer la date"
           @click.stop="emit('clear')"
         >
@@ -66,6 +66,7 @@
         data-test="popover"
         role="dialog"
         class="absolute left-0 right-0 top-full z-20 box-border w-full rounded-b-md bg-white p-[10px] shadow-[0_4px_4px_0_rgba(0,0,0,0.25)]"
+        :class="keyboardFocused ? 'm-combo-ring-bottom' : ''"
       >
         <CalendarHeader
           :view-mode="viewMode"
@@ -114,9 +115,12 @@ import CalendarHeader from './CalendarHeader.vue'
 import MonthPicker from './MonthPicker.vue'
 import {useCalendarPopover} from '../composables/useCalendarPopover'
 import {useCalendarView} from '../composables/useCalendarView'
+import {useKbdFocusRing} from '../../shared/useKbdFocusRing'
 
 defineOptions({name: 'MalioCalendarField', inheritAttrs: false})
 
+const {keyboardFocused, onFocus: onKbdFocus, onBlur: onKbdBlur} = useKbdFocusRing()
+
 const props = withDefaults(
   defineProps<{
     displayValue: string
@@ -236,6 +240,33 @@ const onEnter = () => {
   closePopover()
 }
 
+const onKeydown = (e: KeyboardEvent) => {
+  if (props.disabled || props.readonly) return
+
+  if (e.key === 'Escape') {
+    if (isOpen.value) {
+      e.preventDefault()
+      closePopover()
+    }
+    return
+  }
+
+  if (props.editable) {
+    // En mode éditable, Entrée valide la saisie (Espace = caractère normal)
+    if (e.key === 'Enter') {
+      e.preventDefault()
+      onEnter()
+    }
+    return
+  }
+
+  // Mode non éditable : Entrée / Espace ouvre ou ferme le calendrier
+  if (e.key === 'Enter' || e.key === ' ') {
+    e.preventDefault()
+    onFieldClick()
+  }
+}
+
 watch(() => props.syncTo, (value) => {
   if (isOpen.value) syncToIso(value)
 })
@@ -262,6 +293,7 @@ const mergedInputClass = computed(() =>
         ? 'border-m-success'
         : isReadonly.value ? '' : 'focus:border-m-primary',
     (!isReadonly.value && isOpen.value) ? 'border-m-primary !py-[9px] !rounded-b-none' : '',
+    keyboardFocused.value ? (isOpen.value ? 'm-combo-ring-top' : 'm-focus-ring-kbd') : '',
     props.inputClass,
   ),
 )