fix: remove decimal points from k-formatted numbers

- Use Math.floor() to display whole numbers for billion+ values
- Example: 2,500,123,456 displays as '2,500,123k' instead of '2,500,123.456k'
- Cleaner display for large token numbers

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

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

web/admin/app.js

@@ -2490,7 +2490,7 @@ const app = createApp({
             if (num === null || num === undefined) return '0';
             const number = Number(num);
             if (number >= 1000000000) {
-                return (number / 1000).toLocaleString() + 'k';
+                return Math.floor(number / 1000).toLocaleString() + 'k';
             }
             return number.toLocaleString();
         },