Add Tests iOS/Screens/ page objects and fix gitignore

The screens/ gitignore rule was matching Tests iOS/Screens/ on
case-insensitive macOS. Anchored to /screens/ (repo root only) so
the 7 UI test page object files are no longer ignored.

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

Tests iOS/Screens/EntryDetailScreen.swift

@@ -0,0 +1,62 @@
+//
+//  EntryDetailScreen.swift
+//  Tests iOS
+//
+//  Screen object for the Entry Detail sheet (edit mood, notes, delete).
+//
+
+import XCTest
+
+struct EntryDetailScreen {
+    let app: XCUIApplication
+
+    // MARK: - Elements
+
+    var navigationTitle: XCUIElement { app.navigationBars["Entry Details"] }
+    var doneButton: XCUIElement { app.buttons["entry_detail_done"] }
+    var deleteButton: XCUIElement { app.buttons["entry_detail_delete"] }
+    var moodGrid: XCUIElement { app.otherElements["entry_detail_mood_grid"] }
+
+    /// Mood buttons inside the detail sheet's mood grid.
+    /// These use accessibilityLabel (the mood name text), not identifiers.
+    func moodButton(label: String) -> XCUIElement {
+        app.buttons.matching(NSPredicate(format: "label CONTAINS[cd] %@", label)).firstMatch
+    }
+
+    // MARK: - Actions
+
+    func dismiss() {
+        doneButton.tapWhenReady()
+    }
+
+    func selectMood(_ mood: MoodChoice) {
+        let button = moodButton(label: mood.rawValue.capitalized)
+        button.tapWhenReady()
+    }
+
+    func deleteEntry() {
+        deleteButton.tapWhenReady()
+        // Confirm the delete alert
+        let deleteAlert = app.alerts["Delete Entry"]
+        let confirmButton = deleteAlert.buttons["Delete"]
+        confirmButton.tapWhenReady()
+    }
+
+    // MARK: - Assertions
+
+    func assertVisible(file: StaticString = #file, line: UInt = #line) {
+        XCTAssertTrue(
+            navigationTitle.waitForExistence(timeout: 5),
+            "Entry Detail sheet should be visible",
+            file: file, line: line
+        )
+    }
+
+    func assertDismissed(file: StaticString = #file, line: UInt = #line) {
+        XCTAssertTrue(
+            navigationTitle.waitForDisappearance(timeout: 5),
+            "Entry Detail sheet should be dismissed",
+            file: file, line: line
+        )
+    }
+}