feat: experiments ux improvements

[Zaimwa9]

Thanks for submitting a PR! Please check the boxes below:

• I have read the Contributing Guide.
• 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

• Added scrollbar in MV features dropdown
• Invalidate RTK cache of features when updating a feature value (so the list is up to date in experiment)
• Closes experiment wizard on environment switch
• Improved Variant table UI
• Name in Variant table is actually variant A/B/C/N instead of variant value
• Fixed a bug getting the control value from initial_value
• properly fixed search metrics bar

How did you test this code?

Before

After

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
flagsmith-frontend-preview	Ready	Preview, Comment	May 29, 2026 4:04pm
flagsmith-frontend-staging	Ready	Preview, Comment	May 29, 2026 4:04pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	May 29, 2026 4:04pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-7644	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-7644	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-7644	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-7644	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-7644	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-7644	Finished ✅	Results ✅

[gemini-code-assist]

Code Review

This pull request introduces several updates to the experiments and feature flags UI, including cache invalidation for 'FeatureList' when project flags change, layout and styling improvements for the variation table, and resetting the creation state when switching environments. However, a critical issue was identified in both SetupStep.tsx and ReviewStep.tsx: the fallback logic for 'controlValue' incorrectly uses the project-level 'initial_value' when an environment-specific override is null or undefined. It is recommended to explicitly check for the existence of 'environment_feature_state' first to ensure environment overrides are correctly respected.

[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 37.7 seconds
 91344d9
 🔄 Run: #17109 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 42.9 seconds
 91344d9
 🔄 Run: #17109 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 3 passed

Details

 3 tests across 3 suites
 32.9 seconds
 91344d9
 🔄 Run: #17109 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 49.4 seconds
 91344d9
 🔄 Run: #17109 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 32.2 seconds
 8a3aa80
 🔄 Run: #17111 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 43.2 seconds
 8a3aa80
 🔄 Run: #17111 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 39.7 seconds
 8a3aa80
 🔄 Run: #17111 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 2 passed

Details

 2 tests across 2 suites
 36.8 seconds
 8a3aa80
 🔄 Run: #17111 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 38.5 seconds
 542e23c
 🔄 Run: #17112 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 43.9 seconds
 542e23c
 🔄 Run: #17112 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 3 passed

Details

 3 tests across 3 suites
 38.4 seconds
 542e23c
 🔄 Run: #17112 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 2 passed

Details

 2 tests across 2 suites
 40.9 seconds
 542e23c
 🔄 Run: #17112 (attempt 1)

[github-actions]

Visual Regression

19 screenshots compared. See report for details.
View full report

[Zaimwa9]

@gemini-code-assist review

[gemini-code-assist]

Code Review

This pull request introduces several improvements to the experiments UI, including updating cache invalidation tags for FeatureList, styling adjustments for the VariationTable and scrollbars, wrapping the metrics search input in a flex container, and retrieving the control value from the environment feature state instead of the initial value. Additionally, it resets the creation state when the environment changes. Feedback on the changes suggests replacing the hardcoded VARIANT_LETTERS string with a helper function to dynamically generate Excel-like alphabetical labels (e.g., A, B, ... Z, AA, AB) to gracefully handle more than 26 variations.