feat: require groupId in EntryEditViewModel, add group picker to EntryEditView

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WYqycDFsynHH9VnnK7LNSf

MyPass/Views/EntryDetailView.swift

@@ -9,6 +9,7 @@ import MyPassCore
 
 struct EntryDetailView: View {
     let entry: Entry
+    let groupId: UUID
     let session: VaultSession
 
     @State private var showPassword = false
@@ -30,7 +31,7 @@ struct EntryDetailView: View {
             }
         }
         .sheet(isPresented: $showEditSheet) {
-            EntryEditView(vm: EntryEditViewModel(session: session, existing: entry))
+            EntryEditView(vm: EntryEditViewModel(session: session, groupId: groupId, existing: entry))
         }
         #if os(macOS)
         .keyboardShortcut("e", modifiers: .command)