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Inserts a new PlanProductsSheet as step 1 of the planning flow. Users see their current products as a multi-select checklist (all selected by default) before choosing the planning mode and dates. - Empty state explains the benefit and offers "Add products" CTA while always allowing "Plan without products" to skip - Selected product IDs flow through PlanMenuSheet → PlanDatePickerSheet → MenuService.generateForDates → backend - Backend: added ProductIDs field to generate-menu request body; uses ListForPromptByIDs when set, ListForPrompt otherwise - Backend: added Repository.ListForPromptByIDs (filtered SQL query) - All 12 ARB locale files updated with planProducts* keys Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>