Add commit hash to footer for deployment verification

- Display git commit hash in footer to track deployed version
- Create cross-platform build script to inject commit hash
- Update build process to include version information

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/set-git-commit.js

@@ -0,0 +1,33 @@
+const { execSync } = require('child_process');
+const fs = require('fs');
+const path = require('path');
+
+try {
+  // Get the short commit hash
+  const gitCommit = execSync('git rev-parse --short HEAD').toString().trim();
+  
+  // Create .env.local file with the commit hash
+  const envContent = `NEXT_PUBLIC_GIT_COMMIT=${gitCommit}\n`;
+  const envPath = path.join(process.cwd(), '.env.local');
+  
+  // Read existing .env.local if it exists
+  let existingContent = '';
+  if (fs.existsSync(envPath)) {
+    existingContent = fs.readFileSync(envPath, 'utf8');
+    // Remove any existing NEXT_PUBLIC_GIT_COMMIT line
+    existingContent = existingContent.split('\n')
+      .filter(line => !line.startsWith('NEXT_PUBLIC_GIT_COMMIT='))
+      .join('\n');
+    if (existingContent && !existingContent.endsWith('\n')) {
+      existingContent += '\n';
+    }
+  }
+  
+  // Write the updated content
+  fs.writeFileSync(envPath, existingContent + envContent);
+  
+  console.log(`Git commit hash set: ${gitCommit}`);
+} catch (error) {
+  console.error('Error setting git commit:', error.message);
+  process.exit(1);
+}