feat(canopy-typst): form-building Typst components (checkbox-grid, data-table, field-row, conditional-section)

Source: typst-document-generation plan Potential Improvements.

Plan scope referenced checkbox-grid.typ, data-table.typ, field-row.typ, and conditional-section.typ as reusable form-building components. They were not implemented in Phase 1 (notices only). They are needed for Step 4 (SNAP forms) and Form 297 (single-streamlined application).

Acceptance: components landed in rulesets/{shared,georgia}/notices/components/ with golden-snapshot tests; first consumer is the SNAP recertification form.