feat(scripts, project): add comprehensive code style enforcement script and update style-related workflows

- Created `scripts/check-code-style.js` to enforce coding standards.
  - Includes ESLint, Prettier checks, and custom semicolon rule validation.
  - Outputs actionable feedback for style violations.
- Updated `CONTRIBUTING.md` to document new code style workflows and commands.
- Added style commands to `package.json`:
  - `lint`, `lint:fix`, `format`, `check-format`, and `check-style`.
- Refactored `demo/index.html` to use `Object.defineProperty` for better global property management and prevent conflicts.

These changes enhance the automation of code quality checks, streamline developer workflows, and improve reliability in global property handling for the demo.

scripts/check-code-style.js

@@ -0,0 +1,93 @@
+#!/usr/bin/env node
+
+/**
+ * Script to check code style and enforce no-semicolon rule
+ * This script runs eslint and prettier checks on the codebase
+ */
+
+const { execSync } = require('child_process')
+const path = require('path')
+const fs = require('fs')
+
+// ANSI color codes for terminal output
+const colors = {
+  reset: '\x1b[0m',
+  red: '\x1b[31m',
+  green: '\x1b[32m',
+  yellow: '\x1b[33m',
+  blue: '\x1b[34m',
+  magenta: '\x1b[35m',
+  cyan: '\x1b[36m',
+  white: '\x1b[37m'
+}
+
+console.log(`${colors.cyan}Checking code style...${colors.reset}`)
+console.log(`${colors.cyan}====================${colors.reset}`)
+
+// Run eslint
+try {
+  console.log(`${colors.blue}Running ESLint...${colors.reset}`)
+  execSync('npm run lint', { stdio: 'inherit' })
+  console.log(`${colors.green}ESLint check passed!${colors.reset}`)
+} catch (error) {
+  console.error(`${colors.red}ESLint check failed!${colors.reset}`)
+  console.log(`${colors.yellow}Run 'npm run lint:fix' to automatically fix some issues.${colors.reset}`)
+  process.exit(1)
+}
+
+// Run prettier check
+try {
+  console.log(`${colors.blue}Running Prettier check...${colors.reset}`)
+  execSync('npm run check-format', { stdio: 'inherit' })
+  console.log(`${colors.green}Prettier check passed!${colors.reset}`)
+} catch (error) {
+  console.error(`${colors.red}Prettier check failed!${colors.reset}`)
+  console.log(`${colors.yellow}Run 'npm run format' to automatically format your code.${colors.reset}`)
+  process.exit(1)
+}
+
+// Specific check for semicolons
+console.log(`${colors.blue}Checking for semicolons in code...${colors.reset}`)
+try {
+  // Find all .ts and .js files in src directory
+  const findCommand = "find src -type f -name '*.ts' -o -name '*.js'"
+  const files = execSync(findCommand, { encoding: 'utf8' }).trim().split('\n')
+  
+  let semicolonFound = false
+  
+  for (const file of files) {
+    if (!file) continue
+    
+    const content = fs.readFileSync(file, 'utf8')
+    const lines = content.split('\n')
+    
+    for (let i = 0; i < lines.length; i++) {
+      const line = lines[i]
+      // Skip comments and strings
+      if (line.trim().startsWith('//') || line.trim().startsWith('/*') || 
+          line.trim().startsWith('*') || line.trim().startsWith('*/')) {
+        continue
+      }
+      
+      // Check for semicolons at the end of lines (excluding in string literals and comments)
+      if (line.trim().endsWith(';') && !line.includes('//') && !line.includes('/*')) {
+        console.error(`${colors.red}Semicolon found in ${file}:${i+1}${colors.reset}`)
+        console.error(`${colors.yellow}${line}${colors.reset}`)
+        semicolonFound = true
+      }
+    }
+  }
+  
+  if (semicolonFound) {
+    console.error(`${colors.red}Semicolons found in code! Please remove them.${colors.reset}`)
+    process.exit(1)
+  } else {
+    console.log(`${colors.green}No semicolons found in code!${colors.reset}`)
+  }
+} catch (error) {
+  console.error(`${colors.red}Error checking for semicolons: ${error}${colors.reset}`)
+  process.exit(1)
+}
+
+console.log(`${colors.green}All code style checks passed!${colors.reset}`)
+console.log(`${colors.cyan}Remember: No semicolons in code!${colors.reset}`)