Update README with LeetCode Daily Challenge

Author: jeremymanning

README.md

@@ -45,6 +45,7 @@ This means you'll always find an AI-generated solution to compare with or learn
 | March 23, 2026 | [1594](https://leetcode.com/problems/maximum-non-negative-product-in-a-matrix/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/1594) | 🟡 Medium |
 | March 24, 2026 | [2906](https://leetcode.com/problems/construct-product-matrix/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/2906) | 🟡 Medium |
 | March 25, 2026 | [3546](https://leetcode.com/problems/equal-sum-grid-partition-i/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3546) | 🟡 Medium |
+| March 26, 2026 | [3548](https://leetcode.com/problems/equal-sum-grid-partition-ii/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3548) | 🔴 Hard |
 
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