Add shared form fields for contact details

app/shared/validation/email.ts

@@ -0,0 +1,34 @@
+import { normalizeEmail } from '~/utils/formatters/email'
+
+export const EMAIL_INPUT_PATTERN = '[^\s@]+'
+
+const EMAIL_VALIDATION_PATTERN = /^[^\s@]+@[^\s@]+\.[^\s@]+$/
+
+export type EmailValidationResult = {
+  valid: boolean
+  error?: string
+}
+
+export const EMAIL_VALIDATION_ERROR = 'Adresse email invalide'
+
+/**
+ * Minimal email schema to align validation logic across the UI.
+ */
+export const emailSchema = {
+  pattern: EMAIL_VALIDATION_PATTERN,
+  message: EMAIL_VALIDATION_ERROR,
+  validate(value: string): EmailValidationResult {
+    const normalized = normalizeEmail(value)
+    if (!normalized) {
+      return { valid: true }
+    }
+
+    if (EMAIL_VALIDATION_PATTERN.test(normalized)) {
+      return { valid: true }
+    }
+
+    return { valid: false, error: EMAIL_VALIDATION_ERROR }
+  },
+}
+
+export const isEmailValid = (value: string): boolean => emailSchema.validate(value).valid