display books that need attention in inbox

[elfkuzco]

Rationale

This PR enhances the API to return books that need attention. A book needs attention if it meets one of the following criteria:

• book has no title
• book needs processing
• book needs file operation
• book has error
  The list of books meeting this criteria are shown in the Inbox view

Changes

• add flag to return books that need attention or not. Flag's impact is overriden when any of hte more specific flags are set because of the AND nature of queries
• add dropdown of flags to the UI to filter books with no title, needs processing, needs file operation or has error

This closes #205

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.55%. Comparing base (a70bb92) to head (fed01fe).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
+ Coverage   80.50%   80.55%   +0.04%     
==========================================
  Files          48       48              
  Lines        2088     2093       +5     
  Branches      206      208       +2     
==========================================
+ Hits         1681     1686       +5     
  Misses        351      351              
  Partials       56       56              

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[benoit74]

LGTM