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>

PlantGuideUITests/PlantGuideUITestsLaunchTests.swift

@@ -2,28 +2,20 @@
 //  PlantGuideUITestsLaunchTests.swift
 //  PlantGuideUITests
 //
-//  Created by Trey Tartt on 1/21/26.
+//  Screenshot capture on launch for every UI configuration.
 //
 
 import XCTest
 
-final class PlantGuideUITestsLaunchTests: XCTestCase {
+final class PlantGuideUITestsLaunchTests: BaseUITestCase {
 
     override class var runsForEachTargetApplicationUIConfiguration: Bool {
         true
     }
 
-    override func setUpWithError() throws {
-        continueAfterFailure = false
-    }
-
     @MainActor
     func testLaunch() throws {
-        let app = XCUIApplication()
-        app.launch()
-
-        // Insert steps here to perform after app launch but before taking a screenshot,
-        // such as logging into a test account or navigating somewhere in the app
+        launchClean()
 
         let attachment = XCTAttachment(screenshot: app.screenshot())
         attachment.name = "Launch Screen"