vendor-portal-provider.tsx and task-templates.tsx mixed data-fetching,
state, and rendering in one file, with no caching and hand-rolled form
state. This is a pure refactor with no behavior change.
- vendor-portal-provider.tsx: replace manual useEffect/useState fetch
with useVendorPortalSession (useQuery), closing the token race
condition the old key={token} remount was working around
- task-templates.tsx: split into useTaskTemplateEditor hook plus 4
presentational components; replace hand-rolled form state with
react-hook-form + zod validation; replace the "new" string sentinel
with a NEW_TEMPLATE_ID constant
- add 29 tests (hook, component, and full-page integration) confirming
identical behavior to the original code
