* fix(status-bar): remove pet menu reserved space
* test(status-bar): add pet segment layout validation tests
- Unit test guards against pr-[6.5rem] padding reintroduction
- E2E test measures trailing overhang instead of total width delta
for more accurate layout validation
- Extract enableExperimentalPet helper for test clarity
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Co-authored-by: m4air <m4air@m4airs-Air.localdomain>
