fix: Fix fetchRecommendedBooks filter and error handling

[VedantMadane]

Summary

Fix fetchRecommendedBooks filter and error handling

Changes

• fix fetchRecommendedBooks: use real Mongo filter, correct spelling, surface errors

Fixes #7

[coderabbitai]

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[zeemscript]

Strict review blocker: this branch conflicts with the base branch. Please rebase and resolve conflicts before requesting merge.

[zeemscript]

Strict review blocker: this branch conflicts with the base branch. Please rebase and resolve conflicts before requesting merge.

[zeemscript]

Strict review blocker: this branch conflicts with the base branch. Please rebase and resolve conflicts before requesting merge.

[zeemscript]

@VedantMadane this PR has merge conflicts with the main branch. Please resolve the conflicts (merge main in or rebase) and push the fix so it can be merged. Thanks!

[zeemscript]

@chiscookeke11 you are assigned to the issue that PR #296 addresses, which currently has merge conflicts with the main branch. Please resolve the conflicts (merge main in or rebase) and push the fix so it can be merged. Thanks!