mesmenu: 95.61% -> 97.00%

[SirEnkido]

What changed

All within CMesMenu::onDraw (src/mesmenu.cpp):

• unsigned → signed conversion for the icon frame index
• rewrote the branchless bit-mask frame-offset math as the ternary selects the target codegen implies — keeping the exact mix of condition forms that matches ((frameMask & 2) ? … vs ((frameMask & 2) != 0) ? …); the inconsistency is what the target emits, not a style choice
• split the fused wave-drift expression into named driftX/driftY temporaries
• converted the end-of-function state check to a switch (single-case; the if-form does not reproduce the target's dispatch shape — this was measured, not guessed)
• follow-up commit: replaced the raw (char*)this + 0x3CB8/0x3CBC/0x3D34/0x3D3C/0x3D40 casts in the state-1 DrawRect with real member access (m_mes.mBaseX/mBaseY/mRubyHeight/mRubyY/mRubySpacing), enabled by friend class CMesMenu; in include/ffcc/mes.h — verified byte-identical (DOL sha1 unchanged)

Evidence

• main/mesmenu fuzzy (report.json): 95.61% → 97.00% (96.996864)
• build/GCCP01/ok passes; DOL sha1 matches config/GCCP01/build.sha1
• Rebuilt in a clean worktree and independently re-verified before submission

Notes for review

• The friend declaration touches the shared include/ffcc/mes.h; codegen impact is zero (byte-identical DOL). Inline accessors were the alternative but are more invasive.
• Pre-existing raw this-offset accesses remain in a different function of this file (~lines 1037–1113, several reaching into m_mes); left for a follow-up to keep this PR reviewable.

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Produced by Claude agents following AGENTS.md / WORK_SPLIT.md, operated by @SirEnkido. Every intermediate score in the commit messages was verified against report.json at commit time; the final state was re-verified independently.

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