Add opt-in expected times to cuesheet

[Anon772000]

Summary

• adds an opt-in Show expected times setting to cuesheet/table settings
• uses existing runtime offset expected-time calculation for Start and End cells
• keeps saved rundown times unchanged; the option only affects displayed browser/table values

Fixes #1563

Validation

• pnpm --filter ontime-ui lint
• pnpm --filter ontime-ui typecheck
• pnpm --filter ontime-ui build

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