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/InsightsView/ReportsView.swift

@@ -95,7 +95,9 @@ struct ReportsView: View {
                     viewModel.exportDataPDF()
                 }
             }
+            .accessibilityIdentifier(AccessibilityID.Reports.privacyShareButton)
             Button(String(localized: "Cancel"), role: .cancel) {}
+                .accessibilityIdentifier(AccessibilityID.Reports.privacyCancelButton)
         } message: {
             Text("This report contains your personal mood data and journal notes. Only share it with people you trust.")
         }