fix: merge sessionChanges before finalizing session after refresh (#2401)

[tusharpandey13]

Description

This PR fixes an issue where the beforeSessionSaved hook was not receiving the refreshed token set after a token refresh operation.

Changes

• Pass sessionChanges to finalizeSession so the beforeSessionSaved hook receives the refreshed tokens
• Simplify the session saving logic by merging changes before finalization
• Add comprehensive tests to verify:
  • beforeSessionSaved hook receives refreshed accessToken
  • Changes made in beforeSessionSaved hook are properly honored

Related PRs

• Builds on community contribution from merge sessionChanges before finalizing session after refresh #2401 by @wgoedel
• Uses properly signed commits

Testing

All existing tests pass, plus 2 new test cases:

✓ should provide the refreshed accessToken to beforeSessionSaved hook
✓ should honor changes made to the tokenSet in beforeSessionSaved hook

Co-authored-by: Wolfgang Goedel wgoedel@gmail.com

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.38%. Comparing base (50d25c1) to head (5e8d99f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2414      +/-   ##
==========================================
- Coverage   90.39%   90.38%   -0.02%     
==========================================
  Files          39       39              
  Lines        4488     4481       -7     
  Branches      911      912       +1     
==========================================
- Hits         4057     4050       -7     
  Misses        425      425              
  Partials        6        6              

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