refactor(market): group ~35 file-scope statics into three structs
Collapse the loose market_tab.cpp statics into MarketViewState (s_mkt), PfEditState (s_pfEdit) and PfGridDrag (s_grid). Pure mechanical rename (compile-verified, no behavior change) that shrinks the global surface and gives the upcoming function decompositions a single state handle per concern instead of ~35 free names. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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