feat(qr): complete QR studio, dynamic google fonts, mouse canvas drag, and template sync

supabase/migrations/20260822000000_qr_stand_templates.sql

@@ -0,0 +1,33 @@
+-- QR Stand Templates table for dynamic server-driven template engine
+create table if not exists qr_stand_templates (
+  id uuid primary key default gen_random_uuid(),
+  key text not null unique,
+  name text not null,
+  category_name text,
+  aspect_ratio text default '1/1',
+  bg_type text default 'gradient',
+  bg_image_url text,
+  bg_gradient text,
+  plaque_color text,
+  border_accent text,
+  accent_text text,
+  header_text text,
+  sub_text text,
+  divider_color text,
+  qr_config jsonb,
+  layers jsonb,
+  is_active boolean not null default true,
+  created_at timestamptz not null default now(),
+  updated_at timestamptz not null default now()
+);
+
+-- Public read access for mobile and web
+alter table qr_stand_templates enable row level security;
+
+create policy "Public read active templates"
+  on qr_stand_templates for select
+  using (is_active = true);
+
+create policy "Admins can manage templates"
+  on qr_stand_templates for all
+  using (true);