fix: v1-override-limit-includes-all-feature-segments-in-count

[Zaimwa9]

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• I have added information to docs/ if required so people know about the feature.
• I have filled in the "Changes" section below.
• I have filled in the "How did you test this code" section below.

Changes

Calculation of the segment overrides (in v1) was counting unique segment ids. Leading to situations where you could have 10 segments and unlimited overrides.

• Calculate the limit based on all features states and not distinct segment ids

How did you test this code?

• Added tests, including non-regression tests for v2 extra count

[vercel]

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Project	Deployment	Review	Updated (UTC)
docs	Ready	Preview, Comment	Jan 21, 2026 11:47am
flagsmith-frontend-preview	Ready	Preview, Comment	Jan 21, 2026 11:47am
flagsmith-frontend-staging	Ready	Preview, Comment	Jan 21, 2026 11:47am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-6555	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-6555	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-6555	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-6555	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6555	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6555	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.15%. Comparing base (e491580) to head (f328064).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6555   +/-   ##
=======================================
  Coverage   98.15%   98.15%           
=======================================
  Files        1293     1293           
  Lines       46610    46642   +32     
=======================================
+ Hits        45751    45783   +32     
  Misses        859      859           

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