⚡ Bolt: Vectorize path sanitization to eliminate per-group string manipu (salvages #178)

[abhimehro]

Salvage of #178

Rebased on main (Seatek batch 1).

Salvages: #178

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[cursor]

PR Summary

Low Risk
Low risk performance refactor that preserves existing path-traversal sanitization but changes where sanitized values are computed/consumed; main risk is mismatched column expectations if downstream code assumes the old outliers_df schema.

Overview
Precomputes sanitized safe_sheet and safe_next_year fields in prepare_outliers_df using vectorized string operations, and carries these columns through the empty-DataFrame case.

Updates apply_corrections to use the precomputed sanitized values instead of re-sanitizing per grouped sheet, reducing repeated string manipulation while keeping the same corrected output filename construction.

^{Reviewed by Cursor Bugbot for commit cb65c46. Configure here.}

[codescene-delta-analysis]

Gates Passed
6 Quality Gates Passed

See analysis details in CodeScene

Quality Gate Profile: Pay Down Tech Debt
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