- Settings: add unit_system key (metric | imperial, default metric)
- Recipe LLM prompts: inject unit instruction into L3 and L4 prompts
so generated recipes use the user's preferred units throughout
- Frontend: new utils/units.ts converter (mirrors Python units.py)
- Inventory list: display quantities converted to preferred units
- Settings view: metric/imperial toggle with save button
- Settings store: load/save unit_system alongside cooking_equipment
Closes#81
- RecipesView: level selector (1-4), constraints/allergies tag inputs,
hard day mode toggle, max missing input, expiry-first pantry extraction,
recipe cards with collapsible swaps/directions, grocery links, rate
limit banner
- SettingsView: cooking equipment tag input with quick-add chips, save
with confirmation feedback
- stores/recipes.ts: Pinia store for recipe state + suggest() action
- stores/settings.ts: Pinia store for cooking_equipment persistence
- api.ts: RecipeRequest/Result/Suggestion types + recipesAPI + settingsAPI
- App.vue: two new tabs (Recipes, Settings), lazy inventory load on tab switch
