fix(home): mail readiness warning states the consequence (#3861)

With the admin layout banner removed on the UI side, the readiness 'mail'
row is the single signal for an unconfigured mailer — its warning message
now carries the consequence wording (users register without email
verification) instead of relying on a separate banner. The ok-branch
message and the category order are unchanged.

refs pierreb-devkit/Vue#4297

Author: PierreBrisorgueil

modules/home/services/home.service.js

@@ -99,7 +99,7 @@ const getReadinessStatus = () => {
   checks.push({
     category: 'mail',
     status: mailConfigured ? 'ok' : 'warning',
-    message: mailConfigured ? 'Mail provider configured' : 'No mail provider configured',
+    message: mailConfigured ? 'Mail provider configured' : 'No mail provider configured — users register without email verification',
   });
 
   // billing — Stripe

modules/home/tests/home.service.unit.tests.js

@@ -54,6 +54,25 @@ describe('HomeService.getReadinessStatus unit tests:', () => {
     expect(categories).not.toContain('monitoring');
   });
 
+  describe('mail row', () => {
+    test('warning message states the consequence when no mail provider is configured', async () => {
+      const HomeService = await withConfig({});
+      const checks = HomeService.getReadinessStatus();
+      const row = checks.find((c) => c.category === 'mail');
+      expect(row.status).toBe('warning');
+      expect(row.message).toBe('No mail provider configured — users register without email verification');
+    });
+
+    test('ok message is unchanged when a mail provider is configured', async () => {
+      mockMailerIsConfigured.mockReturnValue(true);
+      const HomeService = await withConfig({});
+      const checks = HomeService.getReadinessStatus();
+      const row = checks.find((c) => c.category === 'mail');
+      expect(row.status).toBe('ok');
+      expect(row.message).toBe('Mail provider configured');
+    });
+  });
+
   describe('errorTracking row', () => {
     test('ok when analytics.posthog.key is set AND errorTracking=true', async () => {
       const HomeService = await withConfig({