The company form outgrew the modal once the branding (logo/stamp) section
was added. Add/edit now live on their own routes:
- /admin/companies/new
- /admin/companies/[id]/edit
- createCompany returns the new id and the create flow lands on the edit
page so logo/stamp can be uploaded immediately
- list "+ Add Company" is a link; row "Edit" navigates to the edit page
- branding is its own card on the edit page (independent uploads)
- list page no longer mints a presigned URL per company (moved to edit)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
