fix(LD Importer): Archive deprecated LaunchDarkly flags on import

[emyller]

Import deprecated flags from LaunchDarkly as archived features in Flagsmith.

Changes

• Archive deprecated flags on import
• Add "Deprecated" tag to deprecated flags
• Removed white text from "importing" overlay — it was very hard to read, and not useful.

I was also very annoyed that there is no user feedback after importing, and came to an improvement I like:

or

---

Closes #5642

Review effort: 2/5

[vercel]

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	Feb 6, 2026 9:40pm

2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
flagsmith-frontend-preview	Ignored	Preview	Feb 6, 2026 9:40pm
flagsmith-frontend-staging	Ignored	Preview	Feb 6, 2026 9:40pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-6447	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-6447	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-6447	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6447	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6447	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-6447	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.22%. Comparing base (cf16f3d) to head (1278f04).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6447   +/-   ##
=======================================
  Coverage   98.22%   98.22%           
=======================================
  Files        1313     1313           
  Lines       47481    47489    +8     
=======================================
+ Hits        46636    46644    +8     
  Misses        845      845           

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[khvn26]

LGTM!

[emyller]

This is now unblocked by #6476.