fix(ui): normalize state labels and tones

[crypt0rr]

Summary

• Use consistent, readable labels and semantic colors for job, scan, host, and incident states.
• Mark destructive platform actions clearly and keep the legacy status refresh affordance explicit.
• Add focused unit and browser regression coverage.

Closes #994

Validation

• Frontend lint passed.
• 348 frontend tests passed; coverage gates passed (93.01% statements, 94.97% lines).
• Production build passed.
• Targeted desktop browser regression passed.
• Frontend changed-line coverage: 94.12%.