refactor: streamline toast system and harmonize UI across tools

- Migrate all toast notifications to sonner and remove custom ToastProvider
- Align Card and TextInput styling across Figlet and Pastel (rounded-lg, border-based)
- Fix build error by removing non-existent export in lib/units/index.ts
- Clean up unused Figlet components and constants

lib/figlet/constants/templates.ts

@@ -1,38 +0,0 @@
-export interface TextTemplate {
-  id: string;
-  label: string;
-  text: string;
-  category: 'greeting' | 'tech' | 'fun' | 'seasonal';
-}
-
-export const TEXT_TEMPLATES: TextTemplate[] = [
-  // Greetings
-  { id: 'hello', label: 'Hello', text: 'Hello!', category: 'greeting' },
-  { id: 'welcome', label: 'Welcome', text: 'Welcome', category: 'greeting' },
-  { id: 'hello-world', label: 'Hello World', text: 'Hello World', category: 'greeting' },
-
-  // Tech
-  { id: 'code', label: 'Code', text: 'CODE', category: 'tech' },
-  { id: 'dev', label: 'Developer', text: 'DEV', category: 'tech' },
-  { id: 'hack', label: 'Hack', text: 'HACK', category: 'tech' },
-  { id: 'terminal', label: 'Terminal', text: 'Terminal', category: 'tech' },
-  { id: 'git', label: 'Git', text: 'Git', category: 'tech' },
-
-  // Fun
-  { id: 'awesome', label: 'Awesome', text: 'AWESOME', category: 'fun' },
-  { id: 'cool', label: 'Cool', text: 'COOL', category: 'fun' },
-  { id: 'epic', label: 'Epic', text: 'EPIC', category: 'fun' },
-  { id: 'wow', label: 'Wow', text: 'WOW!', category: 'fun' },
-
-  // Seasonal
-  { id: 'happy-birthday', label: 'Happy Birthday', text: 'Happy Birthday!', category: 'seasonal' },
-  { id: 'congrats', label: 'Congrats', text: 'Congrats!', category: 'seasonal' },
-  { id: 'thanks', label: 'Thanks', text: 'Thanks!', category: 'seasonal' },
-];
-
-export const TEMPLATE_CATEGORIES = [
-  { id: 'greeting', label: 'Greetings', icon: '👋' },
-  { id: 'tech', label: 'Tech', icon: '💻' },
-  { id: 'fun', label: 'Fun', icon: '🎉' },
-  { id: 'seasonal', label: 'Seasonal', icon: '🎊' },
-] as const;