Add CI/CD pipeline, linting, debounced settings, and cleanup improvements

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Type check
+        run: npm run type-check
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Generate manifest
+        run: node scripts/generate-manifest.js
+        env:
+          OAUTH_CLIENT_ID: ${{ vars.OAUTH_CLIENT_ID || 'ci-placeholder-client-id' }}
+          EXTENSION_KEY: ${{ vars.EXTENSION_KEY || 'ci-placeholder-extension-key' }}
+
+      - name: Build
+        run: npm run build
+        env:
+          VITE_API_URL: ${{ vars.VITE_API_URL }}

.prettierrc

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+{
+  "semi": true,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "trailingComma": "es5",
+  "printWidth": 100
+}

eslint.config.js

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+import js from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import reactHooks from 'eslint-plugin-react-hooks';
+import reactRefresh from 'eslint-plugin-react-refresh';
+import prettierConfig from 'eslint-config-prettier';
+
+export default tseslint.config(
+  { ignores: ['dist', 'node_modules', 'scripts'] },
+  {
+    extends: [js.configs.recommended, ...tseslint.configs.recommended],
+    files: ['**/*.{ts,tsx}'],
+    plugins: {
+      'react-hooks': reactHooks,
+      'react-refresh': reactRefresh,
+    },
+    rules: {
+      ...reactHooks.configs.recommended.rules,
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        { argsIgnorePattern: '^_', varsIgnorePattern: '^_', caughtErrorsIgnorePattern: '^_' },
+      ],
+      'react-refresh/only-export-components': ['warn', { allowConstantExport: true }],
+    },
+  },
+  prettierConfig,
+);