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/constants/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "@discord-clone/constants",
+  "private": true,
+  "version": "1.0.0",
+  "type": "module",
+  "main": "src/index.ts",
+  "devDependencies": {
+    "typescript": "^5.7.0"
+  }
+}