feat: add automatic tooltip repositioning for viewport overflow

[brianzhouzc]

Added logic that detects when tooltips would render outside the viewport and automatically flips/updates their position to maintain visibility.

Related: #7

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ee8df97) to head (3a95fb5).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #108   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           80        94   +14     
=========================================
+ Hits            80        94   +14     

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[brianzhouzc]

Added test case for tooltip overflow.

I used the screeninfo package to get monitor information as it supports multiple platforms. AFAIK there's no reliable way to obtain monitor information natively with Tkinter.