Add ESLint rules for semicolons and double-quotes

[Copilot]

Adds code style enforcement for semicolons and double-quote string literals.

Changes

• Added semi: ['error', 'always'] to enforce semicolons
• Added quotes: ['error', 'double'] to enforce double-quotes

Both rules configured in frontend/eslint.config.js:

rules: {
  ...reactHooks.configs.recommended.rules,
  'react-refresh/only-export-components': [
    'warn',
    { allowConstantExport: true },
  ],
  'semi': ['error', 'always'],
  'quotes': ['error', 'double'],
},

Original prompt

Add an ESLint rule to enforce semicolons

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