feat: show-card-loading-state-and-prevent-opening-until-data-arrives

[Zaimwa9]

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

Closes #6160

• 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?
• I have used a Conventional Commit title for this Pull Request

Changes

• The summary card now appears at page load
• Expanding is blocked until data arrives
• loading state besides the Summary title (feedback welcome, otherwise it can be expanded and loading inside)

How did you test this code?

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-6165	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-6165	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-6165	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6165	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6165	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-6165	Finished ✅	Results ✅

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Project	Deployment	Preview	Comments	Updated (UTC)
flagsmith-frontend-preview	Ready	Preview	Comment	Oct 16, 2025 8:26am
flagsmith-frontend-staging	Ready	Preview	Comment	Oct 16, 2025 8:26am

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ignored			Oct 16, 2025 8:26am