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

.env.example

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+# Image editor — background removal (https://www.remove.bg/api)
+REMOVE_BG_API_KEY=
+# Optional self-hosted rembg HTTP endpoint (POST raw image bytes → PNG)
+REMBG_SERVICE_URL=
+
+# Video render pipeline
+RENDER_WORKER_URL=http://localhost:3355
+RENDER_WORKER_SECRET=
+RENDER_WORKER_PORT=3355
+RENDER_MOCK=true
+NEXRENDER_TEMPLATE_SRC=file:///path/to/template.aep
+NEXRENDER_COMPOSITION=CreatorStudio_Main
+NEXRENDER_BINARY=
+NEXRENDER_SERVER_URL=
+NEXRENDER_WORKPATH=.nexrender
+
+# Site URL for SEO metadata, OAuth, and Stripe redirects
+NEXT_PUBLIC_SITE_URL=http://localhost:3000
+
+# Supabase — required for auth, dashboard, and saving projects (templates → studio)
+# https://supabase.com/dashboard/project/_/settings/api
+# Without these, `npm run dev` still opens the studio via a local mock project ID (dev only).
+NEXT_PUBLIC_SUPABASE_URL=https://your-project.supabase.co
+NEXT_PUBLIC_SUPABASE_ANON_KEY=your-anon-key
+SUPABASE_SERVICE_ROLE_KEY=your-service-role-key
+
+# Stripe — https://dashboard.stripe.com/apikeys
+STRIPE_SECRET_KEY=sk_test_...
+STRIPE_WEBHOOK_SECRET=whsec_...
+
+# Stripe Price IDs (Products → each price → copy ID)
+STRIPE_PRICE_PRO_MONTHLY=price_...
+STRIPE_PRICE_PRO_ANNUAL=price_...
+STRIPE_PRICE_BUSINESS_MONTHLY=price_...
+STRIPE_PRICE_BUSINESS_ANNUAL=price_...