Improve UX and error messaging. Add event badges.

[Copilot]

Multiple UX improvements and error handling enhancements across authentication, event creation, and event display.

Changes

Authentication

• Enhanced error messaging for login/signup failures with specific feedback
• Added AuthError utility for structured error handling

Event Creation

• Refactored form to eliminate input lag
• Added validation preventing users from creating events when not authenticated with actionable error messages
• Implemented check preventing users from rating their own events

Event Display

• Added reputation badge chips to event details
• Created ReportStatusIcons component for visual status indicators
• Fixed date formatting issues in event displays

Navigation

• Suppressed navigation state warnings in settings flow
• Extracted LoadingScreen to reusable component

Technical

• Added dictionaries.ts for centralized string mappings
• Extended type definitions for reputation badges and error handling

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