feat(ui) : MalioDate/DateTime exposent update:valid + saisie clavier DateTime (#MUI-43)

- MalioDate : event update:valid (malforme/hors-plage => false), emis au montage
- MalioDateTime : prop editable (saisie JJ/MM/AAAA HH:MM) + meme update:valid
- CalendarField : masque maska configurable via prop mask
- datetimeFormat : nouveau parseur parseDisplayToIsoDateTime
- fix test Date « Entree » (key 'Enter' reel vs trigger keydown.enter)
- doc COMPONENTS.md + CHANGELOG.md + champ editable dans le playground

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

app/components/malio/date/composables/datetimeFormat.test.ts

@@ -3,6 +3,7 @@ import {
   composeDateTime,
   formatIsoDateTimeToDisplay,
   isValidIsoDateTime,
+  parseDisplayToIsoDateTime,
   splitDateTime,
 } from './datetimeFormat'
 
@@ -49,6 +50,34 @@ describe('datetimeFormat', () => {
     })
   })
 
+  describe('parseDisplayToIsoDateTime', () => {
+    it('parse un JJ/MM/AAAA HH:MM valide en datetime ISO', () => {
+      expect(parseDisplayToIsoDateTime('20/05/2026 14:30')).toBe('2026-05-20T14:30:00')
+      expect(parseDisplayToIsoDateTime('01/01/2026 00:00')).toBe('2026-01-01T00:00:00')
+      expect(parseDisplayToIsoDateTime('31/12/2026 23:59')).toBe('2026-12-31T23:59:00')
+    })
+
+    it('tolère les espaces autour', () => {
+      expect(parseDisplayToIsoDateTime('  20/05/2026 14:30  ')).toBe('2026-05-20T14:30:00')
+    })
+
+    it('rejette une date malformée', () => {
+      expect(parseDisplayToIsoDateTime('32/01/2026 10:00')).toBeNull()
+      expect(parseDisplayToIsoDateTime('10/13/2026 10:00')).toBeNull()
+    })
+
+    it('rejette une heure hors bornes', () => {
+      expect(parseDisplayToIsoDateTime('20/05/2026 24:00')).toBeNull()
+      expect(parseDisplayToIsoDateTime('20/05/2026 12:60')).toBeNull()
+    })
+
+    it('rejette un format incomplet ou sans heure', () => {
+      expect(parseDisplayToIsoDateTime('20/05/2026')).toBeNull()
+      expect(parseDisplayToIsoDateTime('20/05/2026 14')).toBeNull()
+      expect(parseDisplayToIsoDateTime('')).toBeNull()
+    })
+  })
+
   describe('composeDateTime', () => {
     it('recompose un datetime ISO avec secondes à 00', () => {
       expect(composeDateTime('2026-05-20', '14:30')).toBe('2026-05-20T14:30:00')