feat: full studio build -- light theme, canvas thumbnails, i18n (fa/en)

supabase/migrations/001_profiles.sql

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+-- Run in Supabase SQL Editor (Dashboard → SQL)
+
+create table if not exists public.profiles (
+  id uuid primary key references auth.users (id) on delete cascade,
+  email text,
+  plan text not null default 'free' check (plan in ('free', 'pro', 'business')),
+  billing_period text check (billing_period in ('monthly', 'annual')),
+  stripe_customer_id text,
+  stripe_subscription_id text,
+  updated_at timestamptz not null default now()
+);
+
+alter table public.profiles enable row level security;
+
+create policy "Users can read own profile"
+  on public.profiles
+  for select
+  using (auth.uid() = id);
+
+create policy "Users can update own profile"
+  on public.profiles
+  for update
+  using (auth.uid() = id);
+
+-- Optional: auto-create profile on signup
+create or replace function public.handle_new_user()
+returns trigger
+language plpgsql
+security definer
+set search_path = public
+as $$
+begin
+  insert into public.profiles (id, email, plan)
+  values (new.id, new.email, 'free')
+  on conflict (id) do nothing;
+  return new;
+end;
+$$;
+
+drop trigger if exists on_auth_user_created on auth.users;
+
+create trigger on_auth_user_created
+  after insert on auth.users
+  for each row
+  execute function public.handle_new_user();