Refactor components and scripts for improved typing, cleanup unused imports

- Updated chart components (`OrganizationDistributionChart`, `RegistrationActivityChart`, `UserGrowthChart`) with stricter TypeScript interfaces (`TooltipProps`).
- Removed unused imports (`useState`, `Badge`, `API_BASE_URL`) from `DemoModeBanner` and MSW scripts.
- Adjusted MSW function parameters (`_method`, `_operation`) to suppress unused variable warnings.

frontend/src/components/demo/DemoModeBanner.tsx

@@ -7,10 +7,8 @@
 
 'use client';
 
-import { useState } from 'react';
 import config from '@/config/app.config';
 import { Sparkles } from 'lucide-react';
-import { Badge } from '@/components/ui/badge';
 import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover';
 
 export function DemoModeBanner() {