Improve UX: Auto-expanding textarea for long-form input fields

[bosko-m]

Textarea fields in the Governance Action submission form currently have a fixed height with scrollbars, which can reduce readability and make it harder for users to review longer responses — especially for fields with 2,000 and 10,000 character limits. A more user-friendly experience would allow these textareas to automatically expand to fit their content, up to a reasonable maximum height.

This change would enhance comfort and accessibility for applicants writing detailed answers, while preserving layout consistency.

Acceptance Criteria

• Textareas auto-expand vertically as the user types, without requiring scrollbars initially.
• A max-height is defined (e.g., ~400px / 15–20 lines) to prevent layout breakage.
• Once max-height is reached, vertical scrollbar appears inside the textarea.
• Textareas do not show jumpy behavior while typing (height transition is smooth).
• Character counter (e.g., 1254 / 2000) remains functional if present.