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>
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