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/shared/src/components/channel/ReplyBar.module.css

@@ -0,0 +1,35 @@
+.container {
+	display: flex;
+	align-items: center;
+	justify-content: space-between;
+	padding: 8px 12px;
+	background-color: var(--background-secondary);
+	border-radius: var(--radius-lg) var(--radius-lg) 0 0;
+	border-bottom: 2px solid var(--brand-primary);
+}
+
+.text {
+	font-size: 0.875rem;
+	color: var(--text-secondary);
+}
+
+.text strong {
+	color: var(--text-primary);
+}
+
+.cancel {
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	width: 20px;
+	height: 20px;
+	background: none;
+	border: none;
+	cursor: pointer;
+	color: var(--interactive-normal);
+	border-radius: var(--radius-sm);
+}
+
+.cancel:hover {
+	color: var(--interactive-hover);
+}