menu_compa: 95.86% -> 96.41%

[SirEnkido]

What changed

Two source-shape refinements inside CMenuPcs::CompaDraw (src/menu_compa.cpp):

• the food-icon rows loop computes its y offset inline as i * 0x28 (strength-reduction form the target uses) instead of a separate accumulator, and the +1 food-table index is folded into the array subscript so it lands in the load displacement
• the fill-width local is hoisted to function scope and reused for the remaining-width computation, pinning the value in f29 exactly as the target does (variable reuse across roles is a recurring pattern in this codebase's matched functions — see WORK_SPLIT.md "whole-function register webs")

Evidence

• main/menu_compa fuzzy (report.json): 95.86% → 96.41% (96.40594)
• DOL verified byte-identical (sha1 matches config/GCCP01/build.sha1)
• Rebuilt in a clean worktree and independently re-verified before submission

Notes for review

• Reusing fillW for the remaining-width value trades the clearer name remainW for the f29 pin; stated openly rather than hidden.

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