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/NoteEditorScreen.swift

@@ -0,0 +1,63 @@
+//
+//  NoteEditorScreen.swift
+//  Tests iOS
+//
+//  Screen object for the Journal Note editor sheet.
+//
+
+import XCTest
+
+struct NoteEditorScreen {
+    let app: XCUIApplication
+
+    // MARK: - Elements
+
+    var navigationTitle: XCUIElement { app.navigationBars["Journal Note"] }
+    var textEditor: XCUIElement { app.textViews["note_editor_text"] }
+    var saveButton: XCUIElement { app.buttons["note_editor_save"] }
+    var cancelButton: XCUIElement { app.buttons["note_editor_cancel"] }
+
+    // MARK: - Actions
+
+    func typeNote(_ text: String) {
+        textEditor.tapWhenReady()
+        textEditor.typeText(text)
+    }
+
+    func clearAndTypeNote(_ text: String) {
+        textEditor.tapWhenReady()
+        // Select all and replace
+        textEditor.press(forDuration: 1.0)
+        let selectAll = app.menuItems["Select All"]
+        if selectAll.waitForExistence(timeout: 2) {
+            selectAll.tap()
+        }
+        textEditor.typeText(text)
+    }
+
+    func save() {
+        saveButton.tapWhenReady()
+    }
+
+    func cancel() {
+        cancelButton.tapWhenReady()
+    }
+
+    // MARK: - Assertions
+
+    func assertVisible(file: StaticString = #file, line: UInt = #line) {
+        XCTAssertTrue(
+            navigationTitle.waitForExistence(timeout: 5),
+            "Note editor should be visible",
+            file: file, line: line
+        )
+    }
+
+    func assertDismissed(file: StaticString = #file, line: UInt = #line) {
+        XCTAssertTrue(
+            navigationTitle.waitForDisappearance(timeout: 5),
+            "Note editor should be dismissed",
+            file: file, line: line
+        )
+    }
+}