style(auth): replace "E-mail" label with "Courriel" in auth pages

src/features/auth/pages/ForgotPasswordPage.client.js

@@ -96,7 +96,7 @@ export default function ForgotPasswordPage({ onSubmit, onNavigate, currentUser =
           id="email"
           name="email"
           type="email"
-          label="E-mail"
+          label="Courriel"
           value={email}
           onChange={setEmail}
           placeholder="votre@courriel.com"

src/features/auth/pages/LoginPage.client.js

@@ -113,7 +113,7 @@ export default function LoginPage({ onSubmit, onNavigate, onSetSessionCookie, re
           id="email"
           name="email"
           type="email"
-          label="E-mail"
+          label="Courriel"
           value={formData.email}
           onChange={(value) => setFormData(prev => ({ ...prev, email: value }))}
           onKeyDown={handleKeyPress}

src/features/auth/pages/RegisterPage.client.js

@@ -162,7 +162,7 @@ export default function RegisterPage({ onSubmit, onNavigate, currentUser = null
           id="email"
           name="email"
           type="email"
-          label="E-mail"
+          label="Courriel"
           value={formData.email}
           onChange={(value) => setFormData(prev => ({ ...prev, email: value }))}
           placeholder="votre@courriel.com"