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

docs/development/devlog/2025-12-17-023500_unified_toast_design.md

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+### Unified Toast Design
+
+**Status**: Completed
+**Date**: 2025-12-17
+
+**Description**
+Refined the Toast notification design to align perfectly with the "Dark Gaming Aesthetic" of the platform.
+
+**Changes**
+1.  **Consistent Palette**: Switched to `bg-slate-800` (cards) with `border-slate-700` equivalents, using colored accents only for borders and icons.
+2.  **Icon Enclosure**: Icons are now housed in a circular, semi-transparent colored background (`bg-emerald-500/10`) for a polished look.
+3.  **Typography**: Reverted to standard font weights used in other UI cards (`font-medium`) for better readability and consistency.
+4.  **Shadows**: Tuned shadows to be deep but subtle (`shadow-2xl shadow-emerald-900/20`), matching the ambient lighting of the app.
+
+**Effect**
+The Toast now feels like a native part of the UI rather than a generic alert overlay.