Update README with LeetCode Daily Challenge

Author: jeremymanning

README.md

@@ -37,6 +37,7 @@ This means you'll always find an AI-generated solution to compare with or learn
 | January 15, 2026 | [2943](https://leetcode.com/problems/maximize-area-of-square-hole-in-grid/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/2943) | 🟡 Medium |
 | January 16, 2026 | [2975](https://leetcode.com/problems/maximum-square-area-by-removing-fences-from-a-field/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/2975) | 🟡 Medium |
 | January 17, 2026 | [3047](https://leetcode.com/problems/find-the-largest-area-of-square-inside-two-rectangles/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3047) | 🟡 Medium |
+| January 18, 2026 | [1895](https://leetcode.com/problems/largest-magic-square/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/1895) | 🟡 Medium |
 
 </details>