refactor: update class names for consistency and improve styling

- Changed `flex-shrink-0` to `shrink-0` in multiple components for better consistency.
- Updated button and checkbox classes to use `rounded-sm` for a more uniform appearance.
- Adjusted backdrop blur classes for modals to `backdrop-blur-xs` for a subtler effect.
- Removed unused Tailwind CSS configuration file.

src/pages/Dashboard.jsx

@@ -250,7 +250,7 @@ export default function Dashboard() {
                   type="checkbox"
                   checked={newRoom.mute_on_join}
                   onChange={e => setNewRoom({ ...newRoom, mute_on_join: e.target.checked })}
-                  className="w-4 h-4 rounded border-th-border text-th-accent focus:ring-th-ring"
+                  className="w-4 h-4 rounded-sm border-th-border text-th-accent focus:ring-th-ring"
                 />
                 <span className="text-sm text-th-text">{t('dashboard.muteOnJoin')}</span>
               </label>
@@ -259,7 +259,7 @@ export default function Dashboard() {
                   type="checkbox"
                   checked={newRoom.record_meeting}
                   onChange={e => setNewRoom({ ...newRoom, record_meeting: e.target.checked })}
-                  className="w-4 h-4 rounded border-th-border text-th-accent focus:ring-th-ring"
+                  className="w-4 h-4 rounded-sm border-th-border text-th-accent focus:ring-th-ring"
                 />
                 <span className="text-sm text-th-text">{t('dashboard.allowRecording')}</span>
               </label>