jsonforms-renderers: add AutoFillGroup composite control

[mushrafmim]

Summary

• Adds AutoFillGroup, a Group-like composite renderer that fills sibling fields in the same form from a trigger field's own selected record — closes jsonforms-renderers: AutoFillGroup — composite control to auto-fill sibling fields from an API-backed selection #21.
• SearchOption widened to an open record ({id, name, [key: string]: unknown}) so a registered search service can return a full record, not just {id, name}.
• SearchSelectControl now persists the full selected option as payload alongside {value, label} (object mode only) — a 2-line change, no new lookup.
• AutoFillGroupControl watches its trigger's payload (a normal sibling Control, so it inherits whatever search mode — paginated or not — that control already has) and auto-matches every descendant Control by relative path + schema-type compatibility, skipping and warning on a mismatch instead of failing silently. An explicit options.autoFill.fill array remains as an override for renames/reshaping/wholesale drops.
• Rendered as a left-accent callout box with a magic-wand header so it reads as a distinct composite, not a plain Group.

See #21 for the full design writeup and known gaps.

Test plan

• npm run type-check passes
• npm test passes (139 existing tests, unaffected)
• Manually traced the data flow for the new dev/fixtures.ts "Auto-Fill Group" fixture (select → department/firstName/lastName fill; clear → fields clear)
• Not yet visually verified in a running browser (no headless-browser tooling was available in the environment this was built in) — please sanity-check via npm run dev → "Auto-Fill Group" fixture before merging

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