feat: add unified CommandBar Quick-Create for Calendar and Contacts

Implements the same CommandBar quick-create functionality from Todo
in Calendar and Contacts apps with a shared base parser architecture.

- Add base-parser in shared-utils with common patterns (date, time, tags)
- Refactor task-parser to use base-parser
- Create event-parser for Calendar with duration, location, @calendar
- Create contact-parser for Contacts with email, phone, @company detection
- Integrate Quick-Create into Calendar and Contacts layouts

Natural language syntax:
- Common: heute, morgen, Montag, 15.12., um 14 Uhr, #tags
- Calendar: für 2h, 30 min, in Berlin, @Kalender, ganztägig
- Contacts: @Firma, bei Company, auto email/phone detection

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/shared-utils/src/index.ts

@@ -22,3 +22,6 @@ export * from './keyboard';
 
 // IndexedDB Cache
 export * from './cache';
+
+// Natural Language Parsers
+export * from './parsers';