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/InputAmount.test.ts

@@ -184,4 +184,25 @@ describe('MalioInputAmount', () => {
     const wrapper = mountInputAmount({label: 'Champ'})
     expect(wrapper.find('[data-test="required-mark"]').exists()).toBe(false)
   })
+
+  it('readonly : bordure noire même vide, pas de grow/bleu', () => {
+    const wrapper = mountInputAmount({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 = mountInputAmount({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 = mountInputAmount({label: 'Champ', readonly: true, modelValue: '12.50'})
+    expect(wrapper.get('label').classes()).toContain('text-black')
+    expect(wrapper.get('[data-test="icon"]').classes()).toContain('text-black')
+  })
 })