feat(ui) : InputPhone readonly suit les règles readonly (plus de look disabled)

Découple readonly de disabled : le champ affiche border-black + curseur default,
l'icône suit text-black/text-m-muted selon isFilled, et le bouton "add" conserve
son guard onAdd sans porter l'apparence désactivée (opacity-40/cursor-not-allowed).

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

app/components/malio/input/InputPhone.test.ts

@@ -274,10 +274,32 @@ describe('MalioInputPhone', () => {
     expect(wrapper.get('[data-test="add-button"]').attributes('disabled')).toBeDefined()
   })
 
-  it('disables add button when readonly', () => {
+  it('add button is not natively disabled in readonly (onAdd guard blocks the action)', () => {
     const wrapper = mountComponent({addable: true, readonly: true})
 
-    expect(wrapper.get('[data-test="add-button"]').attributes('disabled')).toBeDefined()
+    expect(wrapper.get('[data-test="add-button"]').attributes('disabled')).toBeUndefined()
+  })
+
+  it('readonly : border-black appliqué sur l\'input', () => {
+    const wrapper = mountComponent({label: 'Tel', readonly: true})
+    expect(wrapper.get('input').classes()).toContain('border-black')
+  })
+
+  it('readonly : icône en text-m-muted quand vide', () => {
+    const wrapper = mountComponent({label: 'Tel', readonly: true})
+    expect(wrapper.get('[data-test="icon"]').classes()).toContain('text-m-muted')
+  })
+
+  it('readonly : icône en text-black quand rempli', () => {
+    const wrapper = mountComponent({label: 'Tel', readonly: true, modelValue: '+33612345678'})
+    expect(wrapper.get('[data-test="icon"]').classes()).toContain('text-black')
+  })
+
+  it('readonly : pas d\'apparence désactivée (pas opacity-40)', () => {
+    const wrapper = mountComponent({label: 'Tel', readonly: true})
+    expect(wrapper.get('input').classes()).not.toContain('opacity-40')
+    // and the input is not natively disabled in readonly:
+    expect(wrapper.get('input').attributes('disabled')).toBeUndefined()
   })
 
   it('renders the default add icon (mdi:plus)', () => {