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/voice/VoiceControlBar.module.css

@@ -0,0 +1,84 @@
+.container {
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	gap: 0.75rem;
+}
+
+.button {
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	width: 56px;
+	height: 56px;
+	border-radius: 9999px;
+	border: none;
+	cursor: pointer;
+	background: none;
+	transition-duration: 150ms;
+	transition-property: background-color, color;
+	transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
+	color: var(--voice-text-strong);
+	position: relative;
+}
+
+.icon {
+	width: 28px;
+	height: 28px;
+}
+
+.buttonUnmuted {
+	background-color: var(--voice-surface-4);
+	color: var(--voice-text-strong);
+}
+
+.buttonUnmuted:hover {
+	background-color: var(--voice-surface-5);
+}
+
+.buttonMuted {
+	background-color: var(--voice-status-danger-bg-solid);
+	color: var(--voice-status-danger);
+}
+
+.buttonMuted:hover {
+	background-color: var(--voice-status-danger-bg-strong-solid);
+}
+
+.buttonCameraOn,
+.buttonScreenShareOn {
+	background-color: var(--voice-status-success-bg-solid);
+	color: var(--voice-status-success);
+}
+
+.buttonCameraOn:hover,
+.buttonScreenShareOn:hover {
+	background-color: color-mix(in srgb, var(--voice-status-success) 30%, var(--voice-surface-2));
+}
+
+.buttonDisconnect {
+	background-color: var(--voice-status-danger-bg-solid);
+	color: var(--voice-status-danger);
+}
+
+.buttonDisconnect:hover {
+	background-color: var(--voice-status-danger-bg-strong-solid);
+}
+
+/* Settings cog overlay (top-right of mic/camera buttons) */
+.settingsButton {
+	position: absolute;
+	top: -4px;
+	right: -4px;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	width: 20px;
+	height: 20px;
+	border-radius: 9999px;
+	background-color: var(--background-tertiary);
+	color: var(--text-primary);
+	box-shadow: 0 0 0 2px var(--background-primary);
+	border: none;
+	cursor: pointer;
+}