feat(ui): add Button, Modal, Spinner, Toast, and Tooltip components with styles

- Implemented Button component with various props for customization.
- Created Modal component with header, content, and footer subcomponents.
- Added Spinner component for loading indicators.
- Developed Toast component for displaying notifications.
- Introduced Tooltip component for contextual hints with keyboard shortcuts.
- Added corresponding CSS modules for styling each component.
- Updated index file to export new components.
- Configured TypeScript settings for the UI package.

packages/ui/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "@discord-clone/ui",
+  "private": true,
+  "version": "1.0.0",
+  "type": "module",
+  "main": "src/index.ts",
+  "dependencies": {
+    "@phosphor-icons/react": "^2.1.7",
+    "clsx": "^2.1.1",
+    "framer-motion": "^11.0.0",
+    "@floating-ui/react": "^0.26.0",
+    "react": "^19.2.0",
+    "react-dom": "^19.2.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.7.0"
+  }
+}