feat: complete Phase 3 — advanced features for Casera web app

Adds sharing (residence share codes, join, user management, .casera file
export/import), subscription status with feature comparison, notification
preferences with bell icon, profile settings (edit info, change password,
theme picker, delete account), onboarding wizard with create/join paths,
enhanced dashboard with stats cards, Recharts completion chart, recent
activity feed, and task report PDF download.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/lib/validations/auth.ts

@@ -0,0 +1,84 @@
+import { z } from 'zod';
+
+// ---------------------------------------------------------------------------
+// Login
+// ---------------------------------------------------------------------------
+
+export const loginSchema = z.object({
+  username: z.string().min(1, 'Username or email is required'),
+  password: z.string().min(1, 'Password is required'),
+});
+
+export type LoginFormData = z.infer<typeof loginSchema>;
+
+// ---------------------------------------------------------------------------
+// Register
+// ---------------------------------------------------------------------------
+
+export const registerSchema = z
+  .object({
+    first_name: z.string().min(1, 'First name is required').max(150),
+    last_name: z.string().min(1, 'Last name is required').max(150),
+    username: z
+      .string()
+      .min(3, 'Username must be at least 3 characters')
+      .max(150),
+    email: z.string().email('Invalid email address').max(254),
+    password: z.string().min(8, 'Password must be at least 8 characters'),
+    confirm_password: z.string(),
+  })
+  .refine((data) => data.password === data.confirm_password, {
+    message: "Passwords don't match",
+    path: ['confirm_password'],
+  });
+
+export type RegisterFormData = z.infer<typeof registerSchema>;
+
+// ---------------------------------------------------------------------------
+// Verify email
+// ---------------------------------------------------------------------------
+
+export const verifyEmailSchema = z.object({
+  code: z.string().length(6, 'Code must be 6 digits'),
+});
+
+export type VerifyEmailFormData = z.infer<typeof verifyEmailSchema>;
+
+// ---------------------------------------------------------------------------
+// Forgot password
+// ---------------------------------------------------------------------------
+
+export const forgotPasswordSchema = z.object({
+  email: z.string().email('Invalid email address'),
+});
+
+export type ForgotPasswordFormData = z.infer<typeof forgotPasswordSchema>;
+
+// ---------------------------------------------------------------------------
+// Verify reset code
+// ---------------------------------------------------------------------------
+
+export const verifyResetCodeSchema = z.object({
+  email: z.string().email(),
+  code: z.string().length(6, 'Code must be 6 digits'),
+});
+
+export type VerifyResetCodeFormData = z.infer<typeof verifyResetCodeSchema>;
+
+// ---------------------------------------------------------------------------
+// Reset password
+// ---------------------------------------------------------------------------
+
+export const resetPasswordSchema = z
+  .object({
+    email: z.string().email(),
+    code: z.string(),
+    new_password: z.string().min(8, 'Password must be at least 8 characters'),
+    confirm_password: z.string(),
+  })
+  .refine((data) => data.new_password === data.confirm_password, {
+    message: "Passwords don't match",
+    path: ['confirm_password'],
+  });
+
+export type ResetPasswordFormData = z.infer<typeof resetPasswordSchema>;