Update footer

Added a 'View on GitHub' link to the footer and improved its layout for responsiveness. Removed the 'Words Placed' statistic from the CrosswordGrid component to simplify the grid stats display.

Author: dbccccccc

src/App.tsx

@@ -211,8 +211,18 @@ function App() {
             <p className="text-sm font-medium text-gray-700">
               Crossingword - Powered by AI and Modern Web Tech
             </p>
-            <div className="flex items-center justify-center gap-4 text-xs text-gray-500">
-              <span>Dictionary by{' '}
+            <div className="flex flex-col sm:flex-row items-center justify-center gap-4 text-xs text-gray-500">
+              <a
+                href="https://github.com/dbccccccc/crossingword"
+                target="_blank"
+                rel="noopener noreferrer"
+                className="text-blue-600 hover:text-blue-700 underline font-medium"
+              >
+                View on GitHub
+              </a>
+              <span className="hidden sm:inline text-gray-300">•</span>
+              <span>
+                Dictionary by{' '}
                 <a
                   href="https://dictionaryapi.dev/"
                   target="_blank"
@@ -222,7 +232,7 @@ function App() {
                   Free Dictionary API
                 </a>
               </span>
-              <span className="text-gray-300">•</span>
+              <span className="hidden sm:inline text-gray-300">•</span>
               <span>Built with React, TypeScript & Tailwind CSS</span>
             </div>
           </div>

src/components/Grid/CrosswordGrid.tsx

@@ -105,10 +105,6 @@ export const CrosswordGrid: React.FC<CrosswordGridProps> = ({
       </div>
 
       <div className="mt-4 pt-4 border-t border-gray-200 grid grid-cols-2 sm:grid-cols-4 gap-4 text-sm">
-        <div className="text-center p-2 bg-blue-50 rounded">
-          <div className="text-2xl font-bold text-blue-600">{crossword.placedWords.length}</div>
-          <div className="text-xs text-gray-600">Words Placed</div>
-        </div>
         <div className="text-center p-2 bg-green-50 rounded">
           <div className="text-2xl font-bold text-green-600">{crossword.size.rows}×{crossword.size.cols}</div>
           <div className="text-xs text-gray-600">Grid Size</div>