feat(inventory): local sharing — per-lot share terms, filter and printable catalog

The local half of the original Fase 2 (no network, no Offer entity yet):
- Lot sheet gains a 'do you share it?' choice (gift/swap first, sale last,
  never the default); declaring plenty of abundance reveals it with a nudge.
- Lot lines and list tiles badge shared batches; an 'I share' filter and
  a printable PDF catalog (paper bridge for fairs) round out the view.
- Catalog PDF embeds DejaVu (Latin-ext/Cyrillic/Greek); fonts are a
  per-locale resource like the OCR packs.

apps/app_seeds/lib/state/inventory_cubit.dart

@@ -18,6 +18,7 @@ class InventoryState extends Equatable {
     this.typeFilter = const {},
     this.organicOnly = false,
     this.needsReproductionOnly = false,
+    this.sharingOnly = false,
     this.loading = true,
   });
 
@@ -42,6 +43,10 @@ class InventoryState extends Equatable {
   /// When true, keep only varieties flagged "needs reproducing this season".
   final bool needsReproductionOnly;
 
+  /// When true, keep only varieties with some lot offered to others — the
+  /// "what I share" view.
+  final bool sharingOnly;
+
   final bool loading;
 
   /// Categories present across all items, in display order (deduped), so the
@@ -60,15 +65,16 @@ class InventoryState extends Equatable {
     final q = query.trim().toLowerCase();
     return items.where((i) {
       if (q.isNotEmpty && !i.label.toLowerCase().contains(q)) return false;
-      if (categoryFilter.isNotEmpty &&
-          !categoryFilter.contains(i.category)) {
+      if (categoryFilter.isNotEmpty && !categoryFilter.contains(i.category)) {
         return false;
       }
-      if (typeFilter.isNotEmpty && i.lotTypes.intersection(typeFilter).isEmpty) {
+      if (typeFilter.isNotEmpty &&
+          i.lotTypes.intersection(typeFilter).isEmpty) {
         return false;
       }
       if (organicOnly && !i.isOrganic) return false;
       if (needsReproductionOnly && !i.needsReproduction) return false;
+      if (sharingOnly && !i.isShared) return false;
       return true;
     }).toList();
   }
@@ -81,6 +87,10 @@ class InventoryState extends Equatable {
   /// that filter chip when it would match something.
   bool get hasNeedsReproduction => items.any((i) => i.needsReproduction);
 
+  /// Whether any variety has a lot offered to others, so the UI only offers
+  /// the "sharing" chip and the printable catalog when they'd show something.
+  bool get hasShared => items.any((i) => i.isShared);
+
   InventoryState copyWith({
     List<VarietyListItem>? items,
     List<VarietyListItem>? drafts,
@@ -89,6 +99,7 @@ class InventoryState extends Equatable {
     Set<LotType>? typeFilter,
     bool? organicOnly,
     bool? needsReproductionOnly,
+    bool? sharingOnly,
     bool? loading,
   }) {
     return InventoryState(
@@ -100,6 +111,7 @@ class InventoryState extends Equatable {
       organicOnly: organicOnly ?? this.organicOnly,
       needsReproductionOnly:
           needsReproductionOnly ?? this.needsReproductionOnly,
+      sharingOnly: sharingOnly ?? this.sharingOnly,
       loading: loading ?? this.loading,
     );
   }
@@ -113,6 +125,7 @@ class InventoryState extends Equatable {
     typeFilter,
     organicOnly,
     needsReproductionOnly,
+    sharingOnly,
     loading,
   ];
 }
@@ -157,9 +170,12 @@ class InventoryCubit extends Cubit<InventoryState> {
       emit(state.copyWith(organicOnly: !state.organicOnly));
 
   /// Toggles the "needs reproducing only" filter.
-  void toggleNeedsReproductionOnly() => emit(
-    state.copyWith(needsReproductionOnly: !state.needsReproductionOnly),
-  );
+  void toggleNeedsReproductionOnly() =>
+      emit(state.copyWith(needsReproductionOnly: !state.needsReproductionOnly));
+
+  /// Toggles the "what I share" filter.
+  void toggleSharingOnly() =>
+      emit(state.copyWith(sharingOnly: !state.sharingOnly));
 
   /// Clears all filters (search is left untouched).
   void clearFilters() => emit(
@@ -168,6 +184,7 @@ class InventoryCubit extends Cubit<InventoryState> {
       typeFilter: const {},
       organicOnly: false,
       needsReproductionOnly: false,
+      sharingOnly: false,
     ),
   );
 

apps/app_seeds/lib/state/variety_detail_cubit.dart

@@ -80,6 +80,7 @@ class VarietyDetailCubit extends Cubit<VarietyDetailState> {
     String? originPlace,
     Abundance? abundance,
     PreservationFormat? preservationFormat,
+    OfferStatus offerStatus = OfferStatus.private,
   }) => _repo.addLot(
     varietyId: varietyId,
     type: type,
@@ -91,6 +92,7 @@ class VarietyDetailCubit extends Cubit<VarietyDetailState> {
     originPlace: originPlace,
     abundance: abundance,
     preservationFormat: preservationFormat,
+    offerStatus: offerStatus,
   );
 
   Future<void> updateLot({
@@ -104,6 +106,7 @@ class VarietyDetailCubit extends Cubit<VarietyDetailState> {
     String? originPlace,
     Abundance? abundance,
     PreservationFormat? preservationFormat,
+    OfferStatus offerStatus = OfferStatus.private,
   }) => _repo.updateLot(
     lotId: lotId,
     type: type,
@@ -115,6 +118,7 @@ class VarietyDetailCubit extends Cubit<VarietyDetailState> {
     originPlace: originPlace,
     abundance: abundance,
     preservationFormat: preservationFormat,
+    offerStatus: offerStatus,
   );
 
   Future<void> deleteLot(String lotId) => _repo.softDeleteLot(lotId);