feat(ui) : état readonly visuel sur pickers date/heure

Bordure noire forcée (même vide), suppression du bleu focus/primary, label
et icône en text-black si rempli sinon text-m-muted, float piloté par isFilled
uniquement en readonly. Bouton clear et astérisque inchangés.

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

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

@@ -158,6 +158,7 @@ const inputId = computed(() => props.id?.toString() || `malio-date-${generatedId
 const hasError = computed(() => !!props.error)
 const hasSuccess = computed(() => !!props.success && !hasError.value)
 const isFilled = computed(() => props.displayValue.length > 0)
+const isReadonly = computed(() => props.readonly && !props.disabled)
 const showClear = computed(() =>
   props.clearable && isFilled.value && !props.disabled && !props.readonly,
 )
@@ -195,13 +196,15 @@ const mergedGroupClass = computed(() =>
 const mergedInputClass = computed(() =>
   twMerge(
     'floating-input peer min-h-[40px] w-full cursor-pointer rounded-md border bg-white py-1 pl-3 pr-10 text-lg outline-none transition-[padding] duration-150 placeholder:text-transparent',
-    isFilled.value ? 'border-black' : 'border-m-muted',
+    isReadonly.value
+      ? 'border-black'
+      : isFilled.value ? 'border-black' : 'border-m-muted',
     props.disabled ? 'cursor-not-allowed text-black/60 border-m-muted' : '',
     hasError.value
       ? 'border-m-danger'
       : hasSuccess.value
         ? 'border-m-success'
-        : 'focus:border-m-primary',
+        : isReadonly.value ? '' : 'focus:border-m-primary',
     isOpen.value ? 'border-m-primary !py-[9px] !rounded-b-none' : '',
     props.inputClass,
   ),
@@ -210,14 +213,16 @@ const mergedInputClass = computed(() =>
 const mergedLabelClass = computed(() =>
   twMerge(
     'floating-label absolute left-3 top-2 mt-[5px] inline-block origin-left font-medium text-sm transition-transform duration-150',
-    (isFilled.value || isOpen.value) ? '-translate-y-[1.25rem] scale-90' : '',
+    (isReadonly.value ? isFilled.value : (isFilled.value || isOpen.value)) ? '-translate-y-[1.25rem] scale-90' : '',
     hasError.value
       ? 'text-m-danger'
       : hasSuccess.value
         ? 'text-m-success'
-        : isOpen.value
-          ? 'text-m-primary'
-          : 'peer-placeholder-shown:text-m-muted text-black',
+        : isReadonly.value
+          ? isFilled.value ? 'text-black' : 'text-m-muted'
+          : isOpen.value
+            ? 'text-m-primary'
+            : 'peer-placeholder-shown:text-m-muted text-black',
     props.labelClass,
   ),
 )
@@ -225,6 +230,7 @@ const mergedLabelClass = computed(() =>
 const iconStateClass = computed(() => {
   if (hasError.value) return 'text-m-danger'
   if (hasSuccess.value) return 'text-m-success'
+  if (isReadonly.value) return isFilled.value ? 'text-black' : 'text-m-muted'
   if (isOpen.value) return 'text-m-primary'
   if (isFilled.value) return 'text-black'
   return 'text-m-muted'