Fix #609: move Form Edit textarea sizing styles to classes

[arpitjain099]

Fixes #609

I moved the textarea sizing styles out of inline style props and into class-based styling in the Form Edit components.

What changed:

• added .nonResizableTextarea in formEditStyles.module.css
• replaced inline textarea styles in:
  • FormSummaryEdit
  • AccordionRowPatternEdit
  • FieldsetEdit
  • SexPatternEdit
  • RepeaterPatternEdit
• switched height and overflow to USWDS utility classes (height-15, overflow-auto)

Verification:

• pnpm --filter @gsa-tts/forms-design lint -- src/FormManager/FormEdit/components/FormSummaryEdit.tsx src/FormManager/FormEdit/components/AccordionRowPatternEdit/AccordionRowPatternEdit.tsx src/FormManager/FormEdit/components/FieldsetEdit/FieldsetEdit.tsx src/FormManager/FormEdit/components/SexPatternEdit/SexPatternEdit.tsx src/FormManager/FormEdit/components/RepeaterPatternEdit/RepeaterPatternEdit.tsx

Note: local full workspace build is blocked in this environment by Node 26/native module install incompatibilities; lint on touched components passes.

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Latest commit: 25b1019

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