fix: Update history_utils.dart

[nope3472]

PR Description

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Key Changes:
Moved History Cleanup to a Background Isolate:
Introduced clearExpiredHistoryAsync() in history_utils.dart, which utilizes compute() to filter expired history entries in the background.
Added _filterExpiredHistory(), a top-level function that runs in the isolate to remove expired data efficiently.
Resolves Issue #551

• Closes #

Checklist

• [x ] I have gone through the contributing guide
• [ x] I have updated my branch and synced it with project main branch before making this PR
• [ x] I am using the latest Flutter stable branch (run flutter upgrade and verify)
• [ x] I have run the tests (flutter test) and all tests are passing

Added/updated tests?

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