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

supabase/migrations/003_projects.sql

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+-- User projects (run in Supabase SQL Editor)
+
+create table if not exists public.projects (
+  id uuid primary key default gen_random_uuid(),
+  user_id uuid not null references auth.users (id) on delete cascade,
+  name text not null default 'Untitled project',
+  type text not null check (type in ('video', 'image', 'trimmer')),
+  scene_data jsonb not null default '{}'::jsonb,
+  render_url text,
+  status text not null default 'draft'
+    check (status in ('draft', 'rendering', 'ready')),
+  created_at timestamptz not null default now(),
+  updated_at timestamptz not null default now()
+);
+
+create index if not exists projects_user_id_idx on public.projects (user_id);
+create index if not exists projects_updated_at_idx on public.projects (updated_at desc);
+
+alter table public.projects enable row level security;
+
+create policy "Users can read own projects"
+  on public.projects
+  for select
+  using (auth.uid() = user_id);
+
+create policy "Users can insert own projects"
+  on public.projects
+  for insert
+  with check (auth.uid() = user_id);
+
+create policy "Users can update own projects"
+  on public.projects
+  for update
+  using (auth.uid() = user_id);
+
+create policy "Users can delete own projects"
+  on public.projects
+  for delete
+  using (auth.uid() = user_id);
+
+create or replace function public.set_projects_updated_at()
+returns trigger
+language plpgsql
+as $$
+begin
+  new.updated_at = now();
+  return new;
+end;
+$$;
+
+drop trigger if exists projects_updated_at on public.projects;
+
+create trigger projects_updated_at
+  before update on public.projects
+  for each row
+  execute function public.set_projects_updated_at();