feat: Implement and refine a Toast notification system, and replace the copy pack toast with an animated button.

docs/development/devlog/2025-12-17-022000_replace_alert_with_toast.md

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+
+### Replaced Alert with Toast Notification
+
+**Status**: Completed
+**Date**: 2025-12-17
+
+**Description**
+Replaced the invasive `alert()` on the "Copy Pack" button with a non-intrusive Toast notification.
+
+**Changes**
+1. Created `src/client/src/components/Toast.tsx` with a `ToastProvider` and `useToast` hook.
+2. Wrapped `App.tsx` with `ToastProvider`.
+3. Updated `PackCard.tsx` to use `showToast` instead of `alert`.
+
+**Next Steps**
+- Consider replacing other alerts in `CubeManager` with Toasts for consistency.