Rewrite all UI tests following fail-fast TEST_RULES patterns

Rewrote 60+ test files to follow honeydue-style test guidelines:
- defaultTimeout=2s, navigationTimeout=5s — fail fast, no long waits
- No coordinate taps (except onboarding paged TabView swipes)
- No sleep(), no retry loops
- No guard...else { return } silent passes — XCTFail everywhere
- All elements by accessibility ID via UITestID constants
- Screen objects for all navigation/actions/assertions
- One logical assertion per test method

Added missing accessibility identifiers to app views:
- MonthView.swift: added AccessibilityID.MonthView.grid to ScrollView
- YearView.swift: added AccessibilityID.YearView.heatmap to ScrollView

Framework rewrites:
- BaseUITestCase: added session ID, localeArguments, extraLaunchArguments
- WaitHelpers: waitForExistenceOrFail, waitUntilHittableOrFail,
  waitForNonExistence, scrollIntoView, forceTap
- All 7 screen objects rewritten with fail-fast semantics
- TEST_RULES.md added with non-negotiable rules

Known remaining issues:
- OnboardingTests: paged TabView swipes unreliable on iOS 26 simulator
- SettingsLegalLinksTests: EULA/Privacy buttons too deep in DEBUG scroll
- Customization horizontal picker scrolling needs further tuning

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Tests iOS/NotesTests.swift

@@ -10,91 +10,61 @@ import XCTest
 final class NotesTests: BaseUITestCase {
     override var seedFixture: String? { "single_mood" }
 
-    /// TC-026 / TC-132: Add a note to an existing entry.
-    func testAddNote_ToExistingEntry() {
-        guard app.firstEntryRow.waitForExistence(timeout: 8) else {
-            XCTFail("No entry row found")
-            return
-        }
-        app.firstEntryRow.tapWhenReady()
+    // MARK: - Helpers
 
-        let detailScreen = EntryDetailScreen(app: app)
-        detailScreen.assertVisible()
-
-        // Tap the note area to open the note editor
+    /// Opens the note editor from the entry detail screen.
+    private func openNoteEditor() -> NoteEditorScreen {
+        let noteButton = app.element(UITestID.EntryDetail.noteButton)
         let noteArea = app.element(UITestID.EntryDetail.noteArea)
-        if !noteArea.waitForExistence(timeout: 3) {
-            // Try the note button instead
-            let noteButton = app.element(UITestID.EntryDetail.noteButton)
-            guard noteButton.waitForExistence(timeout: 3) else {
-                XCTFail("Neither note area nor note button found")
-                return
-            }
-            noteButton.tapWhenReady()
+
+        if noteArea.waitForExistence(timeout: defaultTimeout) {
+            noteArea.forceTap()
         } else {
-            noteArea.tapWhenReady()
+            noteButton.waitForExistenceOrFail(timeout: defaultTimeout, message: "Neither note area nor note button found")
+            noteButton.forceTap()
         }
 
         let noteEditor = NoteEditorScreen(app: app)
         noteEditor.assertVisible()
+        return noteEditor
+    }
 
-        // Type a note
+    // MARK: - Tests
+
+    /// TC-026 / TC-132: Add a note to an existing entry and verify it is saved.
+    func testAddNote_ToExistingEntry() {
+        app.firstEntryRow.waitForExistenceOrFail(timeout: navigationTimeout, message: "No entry row found")
+        app.firstEntryRow.forceTap()
+
+        let detailScreen = EntryDetailScreen(app: app)
+        detailScreen.assertVisible()
+
+        let noteEditor = openNoteEditor()
         noteEditor.clearAndTypeNote("Had a great day today!")
-
-        captureScreenshot(name: "note_typed")
-
-        // Save the note
         noteEditor.save()
-
-        // Note editor should dismiss
         noteEditor.assertDismissed()
 
         // Verify the note text is visible in the detail view
         let noteText = app.staticTexts.matching(NSPredicate(format: "label CONTAINS %@", "Had a great day today!")).firstMatch
-        XCTAssertTrue(
-            noteText.waitForExistence(timeout: 5),
-            "Saved note text should be visible in entry detail"
-        )
+        noteText.waitForExistenceOrFail(timeout: navigationTimeout, message: "Saved note text should be visible in entry detail")
 
-        captureScreenshot(name: "note_saved")
-
-        // Dismiss detail
         detailScreen.dismiss()
         detailScreen.assertDismissed()
     }
 
-    /// TC-135: Add a note with emoji and special characters.
-    func testAddNote_WithEmoji() {
-        guard app.firstEntryRow.waitForExistence(timeout: 8) else {
-            XCTFail("No entry row found")
-            return
-        }
-        app.firstEntryRow.tapWhenReady()
+    /// TC-135: Add a note with special characters and verify save completes.
+    func testAddNote_WithSpecialCharacters() {
+        app.firstEntryRow.waitForExistenceOrFail(timeout: navigationTimeout, message: "No entry row found")
+        app.firstEntryRow.forceTap()
 
         let detailScreen = EntryDetailScreen(app: app)
         detailScreen.assertVisible()
 
-        // Open note editor
-        let noteArea = app.element(UITestID.EntryDetail.noteArea)
-        if noteArea.waitForExistence(timeout: 3) {
-            noteArea.tapWhenReady()
-        } else {
-            let noteButton = app.element(UITestID.EntryDetail.noteButton)
-            noteButton.tapWhenReady()
-        }
-
-        let noteEditor = NoteEditorScreen(app: app)
-        noteEditor.assertVisible()
-
-        // Type emoji text - note: XCUITest typeText supports Unicode
+        let noteEditor = openNoteEditor()
         noteEditor.clearAndTypeNote("Feeling amazing! #100")
-
-        // Save
         noteEditor.save()
         noteEditor.assertDismissed()
 
-        captureScreenshot(name: "note_with_special_chars")
-
         detailScreen.dismiss()
         detailScreen.assertDismissed()
     }