Add Stripe fee tracking on paid invoices + backfill function

- Store stripe_fee on invoices when webhook receives checkout.session.completed
- Display Stripe fee and net received in InvoiceDetail when paid via Stripe
- Add backfill-stripe-fees edge function to populate fee on existing paid invoices
- Migration: add stripe_fee column to invoices table
- Includes all pending portal changes (brand book, sign survey, task/project/company updates, etc.)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

supabase/migrations/add_company_brand_fields.sql

@@ -0,0 +1,29 @@
+-- Add brand book / cover page fields to companies
+ALTER TABLE companies
+  ADD COLUMN IF NOT EXISTS address text,
+  ADD COLUMN IF NOT EXISTS contact_name text,
+  ADD COLUMN IF NOT EXISTS contact_email text,
+  ADD COLUMN IF NOT EXISTS contact_phone text,
+  ADD COLUMN IF NOT EXISTS client_logo_url text;
+
+-- Create public bucket for company logos
+DO $$
+BEGIN
+  IF NOT EXISTS (SELECT 1 FROM storage.buckets WHERE id = 'company-logos') THEN
+    INSERT INTO storage.buckets (id, name, public) VALUES ('company-logos', 'company-logos', true);
+  END IF;
+END $$;
+
+-- Storage policies for company-logos
+DROP POLICY IF EXISTS "Authenticated users can manage company logos" ON storage.objects;
+DROP POLICY IF EXISTS "Public can read company logos" ON storage.objects;
+
+CREATE POLICY "Authenticated users can manage company logos"
+  ON storage.objects FOR ALL
+  TO authenticated
+  USING (bucket_id = 'company-logos')
+  WITH CHECK (bucket_id = 'company-logos');
+
+CREATE POLICY "Public can read company logos"
+  ON storage.objects FOR SELECT
+  USING (bucket_id = 'company-logos');