Trim emails before validating them

Zod ran the email format check before trim, so an address with a trailing
space was rejected as invalid. iOS keyboards commonly add one after
autocomplete.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MzFywujuH9TiuXbr9vjoX8

packages/shared/src/schemas.ts

@@ -7,14 +7,17 @@ export const usernameSchema = z
   .toLowerCase()
   .regex(/^[a-z0-9_]{3,32}$/, 'Username must be 3-32 characters: letters, numbers, underscores');
 
+// Trim before validating: iOS keyboards often append a space after autocompleting an email.
+const emailSchema = z.string().trim().toLowerCase().pipe(z.email());
+
 export const registerSchema = z.object({
   username: usernameSchema,
-  email: z.email().trim().toLowerCase(),
+  email: emailSchema,
   password: z.string().min(8, 'Password must be at least 8 characters').max(200),
 });
 
 export const loginSchema = z.object({
-  email: z.email().trim().toLowerCase(),
+  email: emailSchema,
   password: z.string().min(1).max(200),
 });