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

docs/development/devlog/2025-12-17-024000_animated_copy_button.md

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+### Animated Copy Button
+
+**Status**: Completed
+**Date**: 2025-12-17
+
+**Description**
+Replaced the toast notification for the copy action with a self-contained, animated button state.
+
+**Changes**
+1.  **Removed Toast Usage**: Detached `useToast` from `PackCard.tsx`.
+2.  **Local State**: Implemented `copied` state in `PackCard`.
+3.  **UI Feedback**:
+    -   Button transitions from "Copy" (slate) to "Check" (emerald/green) on click.
+    -   Added `animate-in zoom-in spin-in-12` for a satisfying "tick" animation.
+    -   Button background and border glow green to confirm success.
+    -   Auto-reverts after 2 seconds.
+
+**Effect**
+Provides immediate, localized feedback for the copy action without clogging the global UI with notifications.