Warn when deleting search credentials

[dreikanter]

Changes:

• Expand the search-credential deletion confirmation to warn that dependent feeds will be disabled.

Why:

The confirmation now matches the actual destructive effect and the equivalent AI-credential warning.

References:

• Related issue: Review the code structure #1010 (F-068)

Checks:

• Only confirmation copy changes.
• GitHub Actions will verify the branch.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.55%. Comparing base (ce0547a) to head (ce4fbd1).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1086   +/-   ##
=======================================
  Coverage   97.55%   97.55%           
=======================================
  Files         355      355           
  Lines        8358     8358           
=======================================
  Hits         8154     8154           
  Misses        204      204           

Files with missing lines	Coverage Δ
...omponents/search_credential_list_item_component.rb	100.00% <100.00%> (ø)

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