Update README with LeetCode Daily Challenge

Author: jeremymanning

README.md

@@ -349,6 +349,7 @@ _**Note:** Our group is currently taking a break from grinding leetcode. The tab
 | June 1, 2025 | [2929](https://leetcode.com/problems/distribute-candies-among-children-ii/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/2929) | 🟡 Medium |
 | June 2, 2025 | [135](https://leetcode.com/problems/candy/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/135) | 🔴 Hard |
 | June 3, 2025 | [1298](https://leetcode.com/problems/maximum-candies-you-can-get-from-boxes/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/1298) | 🔴 Hard |
+| June 4, 2025 | [3403](https://leetcode.com/problems/find-the-lexicographically-largest-string-from-the-box-i/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3403) | 🟡 Medium |
 
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