refactor: migrate to modular tool-based architecture

- Implement tool registry system with individual tool modules
- Reorganize transformers into categorized source modules
- Remove emojiLibrary.js, consolidate into EmojiUtils and emojiData
- Fix mobile close button and tooltip functionality
- Add build system for transforms and emoji data
- Migrate from Python backend to pure JavaScript
- Add comprehensive documentation and testing
- Improve code organization and maintainability
- Ignore generated files (transforms-bundle.js, emojiData.js)

.github/workflows/README.md

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+# GitHub Actions Workflows
+
+## `deploy.yml` - Automated GitHub Pages Deployment
+
+This workflow automatically builds and deploys the project to GitHub Pages whenever changes are pushed to the `main` or `master` branch.
+
+### What it does:
+
+1. **Build Stage:**
+   - Checks out the repository
+   - Sets up Node.js (v18)
+   - Installs dependencies with `npm ci`
+   - Runs `npm run build` which:
+     - Builds transformer index (`build-index.js`)
+     - Bundles all transformers (`build-transforms.js`)
+     - Generates emoji data (`build-emoji-data.js`)
+     - Injects tool scripts (`inject-tool-scripts.js`)
+     - Injects tool templates into `index.html` (`inject-tool-templates.js`)
+   - Uploads the entire project as a Pages artifact
+
+2. **Deploy Stage:**
+   - Deploys the artifact to GitHub Pages
+   - Makes the site available at your GitHub Pages URL
+
+### Manual Deployment
+
+You can also trigger a deployment manually from the GitHub Actions tab by selecting "Build and Deploy to GitHub Pages" and clicking "Run workflow".
+
+### Required GitHub Settings
+
+For this workflow to function, ensure GitHub Pages is configured in your repository settings:
+
+1. Go to **Settings** → **Pages**
+2. Under **Build and deployment**:
+   - Source: **GitHub Actions**
+3. Save the settings
+
+The site will be available at: `https://<username>.github.io/<repository-name>/`
+
+### Troubleshooting
+
+- **Build fails**: Check the Actions tab for error logs
+- **Missing templates**: Ensure all templates exist in `templates/` directory
+- **Test locally first**: Run `npm run build:templates` before pushing to catch errors early
+- **Verify build output**: Check that `index.html` contains injected templates after build
+
+### Workflow Triggers
+
+- **Push**: Automatically runs on push to `main` or `master`
+- **Workflow Dispatch**: Can be manually triggered from the Actions tab
+

.github/workflows/deploy.yml

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+name: Build and Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [ main, master ]
+  # Allow manual trigger from Actions tab
+  workflow_dispatch:
+
+# Sets permissions for GitHub Pages deployment
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+      
+      - name: Install dependencies
+        run: npm ci
+      
+      - name: Build project
+        run: |
+          echo "Running full build..."
+          npm run build
+          echo "Build complete!"
+      
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: '.'
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4