Use headers from previous tabs, if available

[hugo-vrijswijk]

Issue

When opening a new tab and no defaultHeaders is configured, headers are cleared. Rather than keeping the headers entered from previous tabs.

Headers are often used for authorization. Having to re-enter the headers for every tab is very inconvenient.

Demo of the bug

Screen.Recording.2025-08-20.at.16.20.24.mov

Demo of the fix

Screen.Recording.2025-08-20.at.16.29.15.mov

[changeset-bot]

🦋 Changeset detected

Latest commit: 28211c7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@graphiql/react	Patch

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[hugo-vrijswijk]

ping @benjie @dimaMachina

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.96%. Comparing base (9361440) to head (28211c7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4096      +/-   ##
==========================================
- Coverage   63.99%   63.96%   -0.04%     
==========================================
  Files          35       35              
  Lines        3086     3086              
  Branches      934      947      +13     
==========================================
- Hits         1975     1974       -1     
- Misses       1106     1107       +1     
  Partials        5        5              

see 1 file with indirect coverage changes

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