Danny White b23c6a7fed chore(studio): share key-value field array editor (#43938) ...

## What kind of change does this PR introduce?

Chore that references DEPR-394.

## What is the current behavior?

Key/value editors for headers are implemented separately in multiple
places.

## What is the new behavior?

DEPR-394 is consolidating repeated RHF field-array UIs across Studio and
the design system.

- adds a shared `KeyValueFieldArray` component in `ui-patterns`
- adds a shared `httpHeaderAddActions` helper for preset header rows
- migrates the key/value header editors in:
  - Platform Webhooks
  - Cron Jobs HTTP headers
  - Database Webhooks HTTP headers
- documents the key/value pattern in the design system with:
  - a dedicated fragment page
  - updated forms guidance
  - updated form pattern demos

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## Additional context

This is PR 1 of a 3-PR stack for DEPR-394.

2026-03-24 16:16:03 +11:00

952 B

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