[UI/UX] COINS Tab - Finance Hub Improvements

[ucguy4u]

Part of #187 - UI/UX Architecture Improvements

Tab Purpose

Money management and transactions - Finance Hub

Required Changes

• Balance Hero at top (prominent, gradient container)
• Quick Actions row: Send, Request, Pay, Scan
• Recent Transactions (last 5 items only)
• FAB: 'Add Money' with extended label
• AppBar: Title 'Airo' with History and Help action icons
• Remove DailyQuoteCard (quotes only in Mind tab)

UX Rules

• No greetings
• No quotes
• No music player visible

Files to Modify

• app/lib/features/money/presentation/screens/money_overview_screen.dart