Add Calculator Form Editor React Component example

[hanag-wix]

Summary

• Adds CLI App - Calculator Form — a Wix CLI example demonstrating an Editor React Component extension for Wix Harmony
• Includes a comprehensive README explaining what Editor React Components are, how auto panels work, and step-by-step instructions to reproduce the example (aligned with the video tutorial)
• Follows the same structure as CLI App - FAQ manager: Wix Skills, Wix MCP config, sanitized wix.config.json placeholders

Privacy / sanitization

• No personal app IDs, namespaces, or local paths included
• wix.config.json uses <APP_ID>, <APP_NAMESPACE>, and <CODE_IDENTIFIER> placeholders
• .env.local, .wix/, node_modules/, and dist/ are excluded via .gitignore

Test plan

• Clone the example folder and run npm install
• Configure wix.config.json with a Dev Center app
• Run npx wix login and npx wix env pull
• Run npm run build and npm run dev against a Harmony test site
• Verify Calculator Form widget appears and auto panels work in Harmony editor
• Review README for accuracy and completeness

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