🎨 Palette: Add animation and accessibility to Copy Report button

.Jules/palette.md

@@ -28,3 +28,4 @@
 ## 2025-03-20 - Redundant Visual Values and Slider Accessibility
 **Learning:** SwiftUI Sliders often rely on separate text views (e.g., in an HStack) to display their current value. Screen readers will read the slider and then redundantly read the visual text label as a separate element, causing confusion.
 **Action:** When implementing Sliders with visual value labels, always add `.accessibilityValue(...)` to the Slider itself, and add `.accessibilityHidden(true)` to the redundant text element so it is hidden from VoiceOver.
+## 2026-07-06 - Animated Transient Feedback with Accessibility\n**Learning:** Just changing button text (e.g., 'Copy' -> 'Copied') is abrupt visually and lacks a clear state transition for screen readers, especially without animation or dynamic labels.\n**Action:** When implementing transient feedback, wrap state changes in `withAnimation`, use dynamic `.accessibilityLabel`, and provide an `.accessibilityHint` to ensure the interaction is graceful and accessible.

ios/Sources/App/AppDiagnosticsView.swift

@@ -878,14 +878,28 @@ struct AppDiagnosticsView: View {
                     }
                 }
                 ToolbarItemGroup(placement: .primaryAction) {
-                    Button(copiedReport ? "Copied" : "Copy Report") {
+                    Button {
                         runner.copyReportToPasteboard()
-                        copiedReport = true
+                        withAnimation {
+                            copiedReport = true
+                        }
                         DispatchQueue.main.asyncAfter(deadline: .now() + 1.5) {
-                            copiedReport = false
+                            withAnimation {
+                                copiedReport = false
+                            }
+                        }
+                    } label: {
+                        HStack {
+                            Text(copiedReport ? "Copied!" : "Copy Report")
+                            if copiedReport {
+                                Image(systemName: "checkmark.circle.fill")
+                                    .foregroundColor(.green)
+                            }
                         }
                     }
                     .disabled(runner.report.isEmpty)
+                    .accessibilityLabel(copiedReport ? "Copied diagnostics report" : "Copy diagnostics report")
+                    .accessibilityHint("Copies the diagnostics report to the clipboard")
 
                     Button(runner.isRunning ? "Running..." : (runner.checks.isEmpty ? "Run Diagnostics" : "Run Again")) {
                         copiedReport = false