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/MoodLoggingEmptyStateTests.swift

@@ -13,16 +13,8 @@ final class MoodLoggingEmptyStateTests: BaseUITestCase {
     /// From empty state, log a "Great" mood -> entry row appears in the list.
     func testLogMood_Great_FromEmptyState() {
         let dayScreen = DayScreen(app: app)
-
-        // The mood header should be visible (empty state shows voting header)
-        dayScreen.assertMoodHeaderVisible()
-
-        // Tap "Great" mood button
+        dayScreen.assertVisible()
         dayScreen.logMood(.great)
-
-        // After logging, verify at least one entry row was created.
         dayScreen.assertAnyEntryExists()
-
-        captureScreenshot(name: "mood_logged_great")
     }
 }