1.6.0 foundation: dedup prevención completa + atributo isEstimated

Dedup prevención: UUIDs estables (StableID v5) asignados al default Account y a las
categorías por defecto en createDefaultAccountIfNeeded, ensureDefaultCategoriesExist,
createDefaultCategories y el reset de SettingsViewModel → CloudKit fusiona nativamente,
no más acumulación de duplicados.

isEstimated: nuevo atributo Bool opcional (default NO, syncable) en Snapshot para marcar
snapshots interpolados del auto-relleno. Requiere deploy de schema CloudKit antes del
release. Compila verde (verificado antes de que el agente de widgets empezara a editar).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L2p3gUZRNWW388rWFRjiU7

PortfolioJournal/Models/CoreData/PortfolioJournal.xcdatamodeld/PortfolioJournal.xcdatamodel/contents

@@ -100,6 +100,7 @@
         <attribute name="createdAt" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
         <attribute name="date" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
         <attribute name="id" optional="YES" attributeType="UUID" usesScalarValueType="NO"/>
+        <attribute name="isEstimated" optional="YES" attributeType="Boolean" defaultValueString="NO" usesScalarValueType="YES"/>
         <attribute name="notes" optional="YES" attributeType="String"/>
         <attribute name="value" optional="YES" attributeType="Decimal"/>
         <relationship name="source" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="InvestmentSource" inverseName="snapshots" inverseEntity="InvestmentSource"/>

PortfolioJournal/Models/CoreData/Snapshot+CoreDataClass.swift

@@ -18,6 +18,10 @@ public class Snapshot: NSManagedObject, Identifiable {
     @NSManaged public var value: NSDecimalNumber?
     @NSManaged public var contribution: NSDecimalNumber?
     @NSManaged public var notes: String?
+    /// True for auto-generated (interpolated) snapshots that fill a gap between two
+    /// real snapshots. Estimated snapshots are shown with a distinct marker and can
+    /// be removed in bulk. Defaults to false (model default) for all real snapshots.
+    @NSManaged public var isEstimated: Bool
     @objc public var createdAt: Date {
         get { safeValue(forKey: "createdAt", fallback: .distantPast) }
         set { setManagedValue(newValue, forKey: "createdAt") }

PortfolioJournal/Repositories/AccountRepository.swift

@@ -96,9 +96,12 @@ class AccountRepository: ObservableObject {
             return existing
         }
 
-        // No accounts exist, create Default account
+        // No accounts exist, create Default account.
+        // Use a DETERMINISTIC id so every device creates the same CloudKit record
+        // instead of a per-device duplicate (root-cause fix for the dedup pile-up).
         let defaultCurrency = AppSettings.getOrCreate(in: context).currency
         let account = Account(context: context)
+        account.id = Account.defaultAccountStableID
         account.name = Account.defaultAccountName
         account.currency = defaultCurrency
         account.inputMode = InputMode.simple.rawValue

PortfolioJournal/Repositories/CategoryRepository.swift

@@ -109,6 +109,8 @@ class CategoryRepository: ObservableObject {
             }
 
             let category = Category(context: context)
+            // Deterministic id → same CloudKit record on every device (no duplicates).
+            category.id = Category.stableID(for: categoryData.name)
             category.name = categoryData.name
             category.colorHex = categoryData.colorHex
             category.icon = categoryData.icon

PortfolioJournal/ViewModels/SettingsViewModel.swift

@@ -353,6 +353,7 @@ class SettingsViewModel: ObservableObject {
             if accountCount == 0 {
                 let defaultCurrency = AppSettings.getOrCreate(in: context).currency
                 let account = Account(context: context)
+                account.id = Account.defaultAccountStableID
                 account.name = Account.defaultAccountName
                 account.currency = defaultCurrency
                 account.inputMode = InputMode.simple.rawValue