🧹 Code health improvement: fix empty catch block in MainActivity

[LeanBitLab]

🎯 What: Modified empty catch block to log the exception when attempting to open Usage Access Settings.
💡 Why: Adding a log statement is trivial and safe, improving visibility into silent failures without changing program flow. Empty catch blocks can hide legitimate issues and make debugging difficult.
✅ Verification: Verified by compiling the app successfully (./gradlew :app:assembleDebug) and ensuring all lint and existing tests pass (./gradlew check).
✨ Result: Improved observability on potential errors without breaking existing functionality.

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PR created automatically by Jules for task 2294426157298680174 started by @LeanBitLab

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