fix(cli): disable Freebuff chat logo sheen

[c8dhjp4tyv-bit]

Recreated on the rewritten main after #1102 was auto-closed during repository maintenance. This carries the same reviewed change set on the new history.

Summary

• disable the animated chat-header logo sheen in Freebuff builds
• keep the existing animation for standard Codebuff builds
• add focused regression coverage for both product paths

Fixes #1035

Validation

Prior validation before the history rewrite:

• focused animation tests: 3 passed
• related queue tests: 4 passed
• full CLI suite: 2,367 passed, 9 skipped; existing checkout/environment failures remain (34 failed tests and 32 harness errors)
• CLI typecheck: existing missing tar and react-dom/server declarations; no errors from changed files
• Prettier check for changed files: passed
• git diff --check: passed