feature/conditionally update session handleAccessToken

[tusharpandey13]

only update session if tokenSet has changed in handleAccessToken route handler. This conditional logic is present in getAccessToken() present in client.ts but absent in it's route couterpart in auth-client.ts

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.46%. Comparing base (dbfd502) to head (b216c0d).

Files with missing lines	Patch %	Lines
src/server/auth-client.ts	86.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2054      +/-   ##
==========================================
- Coverage   78.47%   78.46%   -0.01%     
==========================================
  Files          21       21              
  Lines        1909     1913       +4     
  Branches      307      310       +3     
==========================================
+ Hits         1498     1501       +3     
  Misses        405      405              
- Partials        6        7       +1     

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