fix: wizard grey screen, missing form fields, and implement settings page

- Fix Tailwind v4 modal overlay: bg-opacity-75 removed, use bg-gray-500/75
- Restructure AddMailAccountModal with flexbox + relative z-10
- Add missing required fields to form: forward_to, delivery_method,
  delete_after_forward; auto-sync email_address from username
- Fix DashboardLayout mobile overlay opacity (same Tailwind v4 issue)
- Make email_address/forward_to required in MailAccountCreate interface
- Add userApi.updateProfile() method
- Implement Settings page: profile, account info, security sections
- Update CHANGELOG.md and docs/TODO.md

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
Agent-Logs-Url: https://github.com/christianlouis/pop_puller_to_gmail/sessions/d3a9e3bc-5637-45c5-b674-8ef436953614

frontend/src/lib/api.ts

@@ -79,7 +79,7 @@ export interface MailAccount {
 
 export interface MailAccountCreate {
   name: string;
-  email_address?: string;
+  email_address: string;
   protocol: string;
   host: string;
   port: number;
@@ -87,7 +87,7 @@ export interface MailAccountCreate {
   use_tls?: boolean;
   username: string;
   password: string;
-  forward_to?: string;
+  forward_to: string;
   delivery_method?: string;
   is_enabled?: boolean;
   check_interval_minutes?: number;
@@ -176,6 +176,11 @@ export const userApi = {
     const response = await api.get<User>("/users/me");
     return response.data;
   },
+
+  async updateProfile(data: { full_name?: string; email?: string }): Promise<User> {
+    const response = await api.put<User>("/users/me", data);
+    return response.data;
+  },
 };
 
 // ── Mail Accounts API ───────────────────────────────────────────────────