chore: Create flag migration

[kyle-ssg]

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

• [ ] I have added information to docs/ if required so people know about the feature!
• [x] I have filled in the "Changes" section below?
• [x] I have filled in the "How did you test this code" section below?
• [x] I have used a Conventional Commit title for this Pull Request

Changes

• Migrates feature settings, feature value and create feature to typescript components
• Migrates Row / FormGroup to fix imports
• Simplifies interface around the create feature modal, this will eventually mean the RTK/redux store no longer needs to create new objects
  • Editing project/feature related stuff is adjusting the ProjectFlag with a single onChange
  • Editing the remote config, enabled state and MV percentages is adjusting a FeatureState with a single on Chnange
• Minor: add tag button same height as tags

How did you test this code?

E2E covers regression testing on everything this affects

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Project	Deployment	Review	Updated (UTC)
flagsmith-frontend-preview	Ready	Preview, Comment	Dec 16, 2025 1:34pm
flagsmith-frontend-staging	Ready	Preview, Comment	Dec 16, 2025 1:34pm

1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
docs	Ignored	Preview	Dec 16, 2025 1:34pm

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Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-6356	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-6356	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-6356	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith:pr-6356	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6356	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-frontend:pr-6356	Finished :white_check_mark:	Results :white_check_mark:

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