Fix selección de mes en Diario y dashboard a 1 columna cuando hay panel lateral

- JournalView: el .id() extra sobre las filas envolvía el .tag y la selección
  de la List no navegaba (ni en compacto ni en regular). ForEach ya aporta la
  identidad que usa el ScrollViewReader.
- DashboardView: masonry pasa a 1 columna por debajo de 600 pt (inspector de
  Quick Update abierto, Split View) en vez de apretar dos tarjetas.
- DuoLayoutUITests: selecciona el mes anterior por etiqueta y comprueba que se
  abre el check-in.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01F1u4K16xy7eQVtgsYNZ9Vn

PortfolioJournal/Views/Dashboard/DashboardView.swift

@@ -287,7 +287,10 @@ struct DashboardView: View {
         GeometryReader { geo in
             // Scale column count with available width so a wide Mac window fills
             // (3 columns) while an iPad stays at 2. Lead cards span full width.
-            let columnCount = geo.size.width >= 1250 ? 3 : 2
+            // Continuous sizing: 3 columns on a wide Mac window, 2 on an iPad /
+            // Duo inner screen, 1 when a side panel (Quick Update inspector,
+            // Split View) leaves too little room for two readable cards.
+            let columnCount = geo.size.width >= 1250 ? 3 : (geo.size.width >= 600 ? 2 : 1)
             let columns = iPadContextColumns(count: columnCount)
             ScrollView {
                 VStack(spacing: 16) {

PortfolioJournal/Views/Journal/JournalView.swift

@@ -78,9 +78,11 @@ struct JournalView: View {
                             }
                         } else {
                             ForEach(filteredMonthlyNotes) { entry in
+                                // ForEach identity (MonthlyNoteItem.id == date) already serves
+                                // ScrollViewReader; an extra .id() would wrap the .tag trait
+                                // and break List selection.
                                 monthlyNoteRow(entry)
                                     .tag(entry.date)
-                                    .id(entry.date)
                                     .onAppear { currentVisibleMonth = entry.date }
                             }
                         }

PortfolioJournalUITests/DuoLayoutUITests.swift

@@ -74,12 +74,20 @@ final class DuoLayoutUITests: XCTestCase {
 
         openTab(app, "Journal")
         snap(app, "07_journal")
-        let journalCells = app.cells
+        // Seeded data always has last month's check-in: select it by label.
-        if journalCells.count > 1 {
+        let formatter = DateFormatter()
-            journalCells.element(boundBy: 1).tap()
+        formatter.locale = Locale(identifier: "en_US")
-            Thread.sleep(forTimeInterval: 2.0)
+        formatter.dateFormat = "MMM yyyy"
-            snap(app, "08_journal_detail")
+        let lastMonth = Calendar.current.date(byAdding: .month, value: -1, to: Date())!
+        let monthRow = app.staticTexts[formatter.string(from: lastMonth)].firstMatch
+        if monthRow.waitForExistence(timeout: 3) {
+            monthRow.tap()
+        } else if app.cells.count > 1 {
+            app.cells.element(boundBy: 1).tap()
         }
+        Thread.sleep(forTimeInterval: 2.0)
+        XCTAssertFalse(app.staticTexts["Select a Month"].exists, "Journal month selection did not open the check-in")
+        snap(app, "08_journal_detail")
 
         openTab(app, "Settings")
         snap(app, "09_settings")