Fix lint: rename shadowed variables in user model

- findUserByUsername: use imported sql directly instead of destructuring
  it from the callback (shadowed the top-level import)
- findUsersPaginated: rename orderBy callback param from users to t
  (shadowed the outer users result variable)

https://claude.ai/code/session_01E4UUQqQedhFP2F5YcBRArs

app/models/user.ts

@@ -43,7 +43,7 @@ export async function findUsersByIds(ids: string[]): Promise<User[]> {
 export async function findUserByUsername(username: string): Promise<User | undefined> {
   const db = database();
   return await db.query.users.findFirst({
-    where: (users, { sql }) => sql`lower(${users.username}) = lower(${username})`,
+    where: (u) => sql`lower(${u.username}) = lower(${username})`,
   });
 }
 
@@ -128,7 +128,7 @@ export async function findUsersPaginated(options: {
   const [users, [{ count }]] = await Promise.all([
     db.query.users.findMany({
       where: filter,
-      orderBy: (users, { asc }) => [asc(users.displayName)],
+      orderBy: (t, { asc }) => [asc(t.displayName)],
       limit: options.limit,
       offset: options.offset,
     }),