feat(ui) : état readonly visuel sur les inputs floating-label

Applique le traitement readonly canonique (isReadonly, shouldFloatLabel,
mergedInputClass sans grow-height, bordure noire fixe, sans focus:border-m-primary,
mergedLabelClass sans peer-focus, iconStateClass sans isFocused) sur les 6 composants
InputText, InputEmail, InputAmount, InputAutocomplete, InputPassword et InputTextArea.
L'œil de InputPassword reste cliquable en readonly. Tests TDD ajoutés (3 cas par fichier).

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

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

@@ -516,4 +516,25 @@ describe('MalioInputAutocomplete', () => {
     expect(inputClasses).not.toContain('!border-b-0')
     expect(inputClasses).toContain('!border-b-transparent')
   })
+
+  it('readonly : bordure noire même vide, pas de grow/bleu', () => {
+    const wrapper = mountComponent({label: 'Champ', readonly: true})
+    const field = wrapper.get('input')
+    expect(field.classes()).toContain('border-black')
+    expect(field.classes()).not.toContain('border-m-muted')
+    expect(field.classes()).not.toContain('focus:border-m-primary')
+    expect(field.classes()).not.toContain('grow-height')
+  })
+
+  it('readonly vide : label gris, pas de bleu', () => {
+    const wrapper = mountComponent({label: 'Champ', readonly: true})
+    expect(wrapper.get('label').classes()).not.toContain('peer-focus:text-m-primary')
+    expect(wrapper.get('label').classes()).toContain('text-m-muted')
+  })
+
+  it('readonly rempli : label noir et icône noire', () => {
+    const wrapper = mountComponent({label: 'Champ', readonly: true, modelValue: 'fr', options, iconName: 'mdi:magnify', iconPosition: 'left'})
+    expect(wrapper.get('label').classes()).toContain('text-black')
+    expect(wrapper.get('[data-test="icon-left"]').classes()).toContain('text-black')
+  })
 })