Rebuild UI test foundation with page objects, wait helpers, and screen objects

Replace brittle localized-string selectors and broken wait helpers with a
robust, identifier-first UI test infrastructure. All 41 UI tests pass on
iOS 26.2 simulator (iPhone 17).

Foundation:
- BaseUITestCase with deterministic launch helpers (launchClean, launchOffline)
- WaitHelpers (waitUntilHittable, waitUntilGone, tapWhenReady) replacing sleep()
- UITestID enum mirroring AccessibilityIdentifiers from the app target
- Screen objects: TabBarScreen, CameraScreen, CollectionScreen, TodayScreen,
  SettingsScreen, PlantDetailScreen

Key fixes:
- Tab navigation uses waitForExistence+tap instead of isHittable (unreliable
  in iOS 26 simulator)
- Tests handle real app state (empty collection, no camera permission)
- Increased timeouts for parallel clone execution
- Added NetworkMonitorProtocol and protocol-typed DI for testability
- Fixed actor-isolation issues in unit test mocks

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

Docs/uiTestPrompt.md

@@ -0,0 +1,65 @@
+# UI Test Generation Prompt Template
+
+Use this prompt when asking an AI to generate a new UI test for PlantGuide.
+
+---
+
+## Prompt
+
+Write a UI test for **[FEATURE DESCRIPTION]** in PlantGuide.
+
+### Requirements
+
+- Inherit from `BaseUITestCase` (not `XCTestCase`)
+- Import only `XCTest`
+- Mark test methods `@MainActor`
+- Launch with `launchClean()`, `launchWithMockData()`, or `launchOffline()` as appropriate
+- Navigate using screen objects: `TabBarScreen(app: app).tapCollection()`
+- Locate elements via `UITestID.*` identifiers, not localized strings
+- Wait with `waitForExistence(timeout:)`, `waitUntilHittable()`, `waitUntilGone()`
+- Never use `sleep()`
+- One assertion focus per test method
+- Use Given/When/Then comments for clarity
+
+### File Structure
+
+```swift
+import XCTest
+
+final class [Feature]UITests: BaseUITestCase {
+
+    @MainActor
+    func test[Behavior]() throws {
+        // Given
+        launchWithMockData()
+        let screen = TabBarScreen(app: app).tap[Tab]()
+        XCTAssertTrue(screen.waitForLoad())
+
+        // When
+        screen.[element].tapWhenReady()
+
+        // Then
+        XCTAssertTrue([assertion])
+    }
+}
+```
+
+### Available Screen Objects
+
+- `TabBarScreen` -- `tapCamera()`, `tapCollection()`, `tapToday()`, `tapSettings()`
+- `CameraScreen` -- `captureButton`, `hasValidState()`
+- `CollectionScreen` -- `searchField`, `filterButton`, `viewModeToggle`, `emptyStateView`
+- `TodayScreen` -- `todaySection`, `overdueSection`, `emptyStateView`
+- `SettingsScreen` -- `clearCacheButton`, `notificationsToggle`, `versionInfo`
+- `PlantDetailScreen` -- `plantName`, `favoriteButton`, `editButton`, `deleteButton`
+
+### Available Identifiers
+
+See `PlantGuideUITests/Foundation/UITestID.swift` for the full list.
+All identifiers mirror `PlantGuide/Core/Utilities/AccessibilityIdentifiers.swift`.
+
+### If an identifier is missing
+
+1. Add it to `AccessibilityIdentifiers.swift` in the app
+2. Add `.accessibilityIdentifier(...)` to the view
+3. Mirror it in `UITestID.swift` in the test target