feat(pop): port production/process screen from legacy POP (Phase A + B-1)

Phase A — Legacy POP 이식:
- Copy WorkOrderList, ProcessWork, AcceptProcessModal, ProcessDetailModal,
  DefectTypeModal, ProcessTimer to app/(main)/COMPANY_7/pop/_components/production/
- New useProcessData hook: single sync call on mount + 3s throttle + toast errors
- Add /COMPANY_7/pop/production/process to usePopSettings URL mapping
- Update POP.md work log (legacy POP copy exception for this task)

Phase B-1 — ProcessWork 1st section split:
- Extract MaterialInputSection (ProcessWork 2993→2637, -356 lines)
- Plan revision: TimerPanel removed (dead code confirmed in original)

Plan: .claude/plans/pop-process-execution.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/hooks/pop/usePopSettings.ts

@@ -120,6 +120,7 @@ const POP_SCREEN_MAP: Record<string, number> = {
   "/pop/outbound/sales": 5,
   "/pop/production": 8,
   "/pop/production/process": 7,
+  "/COMPANY_7/pop/production/process": 7,
 };
 
 // URL -> settingsKey mapping
@@ -132,6 +133,7 @@ const PATH_TO_SETTINGS_KEY: Record<string, keyof PopSettings["screens"]> = {
   "/pop/outbound/sales": "outbound",
   "/pop/production": "processExecution",
   "/pop/production/process": "processExecution",
+  "/COMPANY_7/pop/production/process": "processExecution",
 };
 
 function getScreenIdFromPath(pathname: string): number | null {