feat: Add comprehensive ControlledTextArea Storybook stories

[codegen-sh]

Overview

This PR implements comprehensive Storybook stories for the ControlledTextArea component as part of the Medusa Forms controlled components documentation effort.

Changes

✅ All 5 Required Story Variants Implemented:

1. BasicUsage - Simple textarea with react-hook-form integration and multi-line text input
2. CharacterLimits - Maximum character count validation, character counter display, and limit enforcement
3. RequiredFieldValidation - Required field validation, error state display, and custom validation messages
4. AutoResizeFunctionality - Dynamic height adjustment, content-based resizing, and min/max height constraints
5. ValidationErrorStates - Various error scenarios, error message display, and field highlighting

✅ Additional Features:

6. ComprehensiveExample - Complete form showing multiple ControlledTextArea components working together

Implementation Details

• ✅ Follows established pattern from ControlledInput.stories.tsx
• ✅ Uses react-hook-form directly with FormProvider and useForm (NO react-router-stub dependencies)
• ✅ Multiple states covered (basic, validation, error, character limits)
• ✅ Auto-resize and character limit functionality demonstrated
• ✅ Well-documented stories with appropriate descriptions and controls
• ✅ Real-world usage patterns with proper validation using zod schemas

File Created

• apps/docs/src/medusa-forms/ControlledTextArea.stories.tsx

Testing

The stories can be tested in Storybook by running the docs application and navigating to "Medusa Forms/Controlled Text Area".

Acceptance Criteria ✅

• All 5 story variants implemented
• Stories use react-hook-form directly without react-router wrapper
• Multiple states covered (basic, validation, error, character limits)
• Follows consistent pattern with existing ControlledInput story
• Auto-resize and character limit functionality demonstrated
• Stories are well-documented with appropriate args and controls

Closes LC-245

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