feat(ui): clarify automatic filter guidance

[Ryson-32]

Summary

• Clarify that matched nodes are excluded globally and restored when automatic filtering is disabled.
• Show the helper text before the regular-expression input while preserving the existing form-field default.
• Add regression coverage for helper placement and accessible descriptions.

Validation

• Public CI
• Dev Release

[Copilot]

Pull request overview

This PR improves the clarity and UX of automatic node filtering guidance in the converter’s advanced node management dialog, and extends the shared FormField component to support rendering helper text before the control for better readability.

Changes:

• Updated the exclusion-regex helper text to clarify global exclusion behavior and restoration when automatic filtering is disabled.
• Added descriptionPlacement to FormField to support rendering the description before the control while keeping the existing default behavior.
• Added/updated regression tests to cover helper placement and accessible description wiring.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/ui/src/product/converter/advanced-mode/sections/node-management/auto-processing-dialog.tsx	Updates helper copy and opts into description-before-control placement for the regex textarea.
packages/ui/src/product/converter/advanced-mode/sections/node-management/auto-processing-dialog.test.ts	Adjusts mocks and assertions to verify helper placement and props passed to FormField.
packages/ui/src/components/ui/form-field.tsx	Adds descriptionPlacement API and renders description either before or after the control while preserving aria-describedby behavior.
packages/ui/src/components/ui/form-controls.test.ts	Adds regression coverage for the new placement behavior and ordering/accessibility expectations.

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