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>

CLAUDE.md

@@ -9,13 +9,19 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 xcodebuild -project PlantGuide.xcodeproj -scheme PlantGuide -configuration Debug
 
 # Run all tests
-xcodebuild test -project PlantGuide.xcodeproj -scheme PlantGuide -destination 'platform=iOS Simulator,name=iPhone 16'
+xcodebuild test -project PlantGuide.xcodeproj -scheme PlantGuide -destination 'platform=iOS Simulator,name=iPhone 17'
 
 # Run a single test class
-xcodebuild test -project PlantGuide.xcodeproj -scheme PlantGuide -destination 'platform=iOS Simulator,name=iPhone 16' -only-testing:PlantGuideTests/HybridIdentificationUseCaseTests
+xcodebuild test -project PlantGuide.xcodeproj -scheme PlantGuide -destination 'platform=iOS Simulator,name=iPhone 17' -only-testing:PlantGuideTests/HybridIdentificationUseCaseTests
 
 # Run a single test method
-xcodebuild test -project PlantGuide.xcodeproj -scheme PlantGuide -destination 'platform=iOS Simulator,name=iPhone 16' -only-testing:PlantGuideTests/SavePlantUseCaseTests/testSavePlant_Success
+xcodebuild test -project PlantGuide.xcodeproj -scheme PlantGuide -destination 'platform=iOS Simulator,name=iPhone 17' -only-testing:PlantGuideTests/SavePlantUseCaseTests/testSavePlant_Success
+
+# Build UI tests only (compile check, no simulator required)
+xcodebuild build-for-testing -project PlantGuide.xcodeproj -scheme PlantGuide -destination 'platform=iOS Simulator,name=iPhone 17' -quiet
+
+# Run all UI tests
+xcodebuild test -project PlantGuide.xcodeproj -scheme PlantGuide -destination 'platform=iOS Simulator,name=iPhone 17' -only-testing:PlantGuideUITests
 ```
 
 ## App Structure
@@ -109,3 +115,58 @@ Entities (all CloudKit-compatible with optional attributes):
 - Test fixtures available for `Plant`, `CareTask`, `PlantCareSchedule`
 - Mock services: `MockPlantCollectionRepository`, `MockNetworkService`, etc.
 - In-memory Core Data stack for test isolation: `CoreDataStack(inMemory: true)`
+
+### UI Testing
+
+UI tests live in `PlantGuideUITests/` using a page-object foundation. See [Docs/XCUITest-Authoring.md](Docs/XCUITest-Authoring.md) for the full guide.
+
+**Key patterns:**
+- Inherit `BaseUITestCase`, not `XCTestCase`
+- Launch with `launchClean()`, `launchWithMockData()`, or `launchOffline()`
+- Locate elements via `UITestID.*` identifiers (mirrors `AccessibilityIdentifiers` in app)
+- Navigate with screen objects: `TabBarScreen`, `CameraScreen`, `CollectionScreen`, `TodayScreen`, `SettingsScreen`, `PlantDetailScreen`
+- Wait with `waitForExistence(timeout:)`, `waitUntilHittable()`, `waitUntilGone()` -- never `sleep()`
+- One assertion focus per test method
+
+## Claude GitHub App
+
+### Installation
+1. Go to [github.com/apps/claude](https://github.com/apps/claude)
+2. Click "Install" and select this repository
+3. Grant the requested permissions (read/write for code, issues, and pull requests)
+4. Authenticate with your Anthropic account when prompted
+
+### How It Works
+- The app reads this `CLAUDE.md` file for project context and contribution rules
+- Claude responds to `@claude` mentions in issues and PRs
+- No API key configuration needed - authentication is handled through the GitHub App integration
+
+### Triggering Claude
+- **Issues**: Mention `@claude` in an issue to request implementation help
+- **PRs**: Mention `@claude` to request code review or changes
+
+## Claude Contribution Rules
+
+### Scope
+- Work ONLY on the issue explicitly assigned to you.
+- One issue = one pull request.
+- Do not refactor unrelated code.
+- Do not change public APIs unless the issue explicitly says so.
+
+### Safety Rules
+- Never auto-merge.
+- Never force-push to main.
+- Never delete code unless instructed.
+- Preserve existing behavior unless tests say otherwise.
+
+### iOS Rules
+- Respect Swift concurrency (MainActor, async/await).
+- Do not introduce Combine unless already used.
+- Prefer pure functions for new logic.
+- No new dependencies without approval.
+
+### Output Expectations
+Each PR must include:
+- Clear summary of changes
+- Files touched (with rationale)
+- Risks and how to test