Complete accessibility identifier coverage across all 152 project files

Exhaustive file-by-file audit of every Swift file in the project (iOS app,
Watch app, Widget extension). Every interactive UI element — buttons, toggles,
pickers, links, menus, tap gestures, text editors, color pickers, photo
pickers — now has an accessibilityIdentifier for XCUITest automation.

46 files changed across Shared/, Onboarding/, Watch App/, and Widget targets.
Added ~100 new ID definitions covering settings debug controls, export/photo
views, sharing templates, customization subviews, onboarding flows, tip
modals, widget voting buttons, and watch mood buttons.

Shared/Views/SettingsView/PaywallPreviewSettingsView.swift

@@ -35,6 +35,7 @@ struct PaywallPreviewSettingsView: View {
                 Button("Done") {
                     dismiss()
                 }
+                .accessibilityIdentifier(AccessibilityID.Debug.paywallPreviewDoneButton)
             }
         }
         .sheet(isPresented: $showFullPreview) {
@@ -160,6 +161,7 @@ struct PaywallPreviewSettingsView: View {
             .foregroundColor(.white)
             .clipShape(RoundedRectangle(cornerRadius: 14))
         }
+        .accessibilityIdentifier(AccessibilityID.Debug.viewFullPaywallButton)
     }
 
     private var gradientColors: [Color] {
@@ -241,6 +243,7 @@ struct StyleOptionRow: View {
                     .stroke(isSelected ? Color.accentColor : Color.clear, lineWidth: 2)
             )
         }
+        .accessibilityIdentifier(AccessibilityID.Debug.paywallStyleOption(style.displayName))
         .buttonStyle(.plain)
     }