feat(ui): Add GitHub integration and enhance hero section design

- Add GitHub star counter badge to navigation (desktop and mobile)
- Implement grid pattern background in hero section
- Redesign hero title with inline PDF Toolkit badge and briefcase icon
- Update feature badges styling with improved visual hierarchy
- Refactor CTA button layout with icon integration
- Add simple-mode-footer utility component for footer management
- Update all tool pages with consistent styling improvements
- Enhance responsive design for mobile navigation with GitHub link
- Improve visual consistency across all pages with updated color scheme

src/js/utils/simple-mode-footer.ts

@@ -0,0 +1,27 @@
+import { APP_VERSION } from '../../version.js';
+
+// Handle simple mode footer replacement for tool pages
+if (__SIMPLE_MODE__) {
+    const footer = document.querySelector('footer');
+    if (footer) {
+        footer.style.display = 'none';
+
+        const simpleFooter = document.createElement('footer');
+        simpleFooter.className = 'mt-16 border-t-2 border-gray-700 py-8';
+        simpleFooter.innerHTML = `
+      <div class="container mx-auto px-4">
+        <div class="flex items-center mb-4">
+          <img src="../../images/favicon.svg" alt="Bento PDF Logo" class="h-8 w-8 mr-2">
+          <span class="text-white font-bold text-lg">BentoPDF</span>
+        </div>
+        <p class="text-gray-400 text-sm">
+          &copy; 2025 BentoPDF. All rights reserved.
+        </p>
+        <p class="text-gray-500 text-xs mt-2">
+          Version <span id="app-version-simple">${APP_VERSION}</span>
+        </p>
+      </div>
+    `;
+        document.body.appendChild(simpleFooter);
+    }
+}