Release 1.4.0 (build 31): retención, quick update, streak, what's new

- 1A: Notificación mensual de resumen de portfolio (día 5 de cada mes)
- 1B: Badge de racha mensual en Dashboard (streak counter)
- 1C: Empty states mejorados en Goals y Journal con CTAs claros
- 2A: Quick Update sheet — actualiza todas las fuentes desde una pantalla
- 2B: Notificación batch update redirige al Quick Update sheet
- 2C: Widget deep link portfoliojournal://quickupdate abre Quick Update
- 3A: App Store version check banner en Settings
- 3C: What's New sheet en primer launch de versión nueva
- Localización completa en 7 idiomas para todas las nuevas strings

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

PortfolioJournal/ViewModels/SourceListViewModel.swift

@@ -8,7 +8,7 @@ class SourceListViewModel: ObservableObject {
 
     @Published var sources: [InvestmentSource] = []
     @Published var categories: [Category] = []
-    @Published var selectedCategory: Category?
+    @Published var selectedCategoryIds: Set<UUID> = []
     @Published var searchText = ""
     @Published var selectedAccount: Account?
     @Published var showAllAccounts = true
@@ -55,7 +55,7 @@ class SourceListViewModel: ObservableObject {
         Publishers.CombineLatest4(
             sourceRepository.$sources,
             $searchText.debounce(for: .milliseconds(300), scheduler: DispatchQueue.main),
-            $selectedCategory,
+            $selectedCategoryIds,
             $selectedAccount
         )
         .combineLatest($showAllAccounts)
@@ -88,9 +88,12 @@ class SourceListViewModel: ObservableObject {
             filtered = filtered.filter { $0.account?.id == selectedAccountId }
         }
 
-        // Filter by category
-        if let category = selectedCategory {
-            filtered = filtered.filter { $0.category?.id == category.id }
+        // Filter by category (multi-select)
+        if !selectedCategoryIds.isEmpty {
+            filtered = filtered.filter {
+                guard let id = $0.category?.id else { return false }
+                return selectedCategoryIds.contains(id)
+            }
         }
 
         // Filter by search text
@@ -200,21 +203,29 @@ class SourceListViewModel: ObservableObject {
     }
 
     var isEmpty: Bool {
-        sources.isEmpty && searchText.isEmpty && selectedCategory == nil
+        sources.isEmpty && searchText.isEmpty && selectedCategoryIds.isEmpty
     }
 
     var isFiltered: Bool {
-        !searchText.isEmpty || selectedCategory != nil
+        !searchText.isEmpty || !selectedCategoryIds.isEmpty
     }
 
     // MARK: - Category Filter
 
     func selectCategory(_ category: Category?) {
-        selectedCategory = category
+        guard let category else {
+            selectedCategoryIds = []
+            return
+        }
+        if selectedCategoryIds.contains(category.id) {
+            selectedCategoryIds.remove(category.id)
+        } else {
+            selectedCategoryIds.insert(category.id)
+        }
     }
 
     func clearFilters() {
         searchText = ""
-        selectedCategory = nil
+        selectedCategoryIds = []
     }
 }