Replace Alert dialogs with Toast notifications and fix safe area

[stackedPenguin]

Summary

• Replace all 37 Alert.alert() calls with elegant Toast.show() notifications
• Fix bottom navigation safe area padding for devices with notches/gesture bars
• Simplify confirmation dialogs to execute directly with toast feedback
• Improve user experience with consistent, non-blocking toast notifications

Changes Made

Toast Notifications (37 replacements)

✅ Transaction Alerts (1)

• Transaction success confirmation → Success toast

✅ Wallet Management (8)

• Wallet deletion success/errors
• Duplicate wallet warnings
• Import/create wallet errors
• Seed phrase validation errors

✅ Ledger Connection (11)

• Bluetooth permissions
• Setup instructions
• Scan/connection errors
• USB connection errors
• Device pairing/forgetting

✅ Settings & Preferences (5)

• Network connection errors
• Preferences info
• About wallet info
• Reset wallet
• Clear PIN & biometrics

✅ Confirmation Dialogs → Direct Actions (12)

• All confirmation dialogs now execute directly with toast feedback
• Examples: delete wallet, reset wallet, forget device, clear PIN, change seed phrase

Safe Area Fix

✅ Wrapped app with SafeAreaProvider
✅ Added useSafeAreaInsets() hook
✅ Updated bottom navigation to use dynamic padding
✅ Removed hardcoded padding values

Technical Details

• Removed Alert import from react-native
• Consistent toast patterns:
  • type: "success" for successful operations
  • type: "error" for errors
  • type: "info" for informational messages
  • position: "bottom" for all toasts

Test Plan

• Transaction complete shows success toast
• Wallet operations show appropriate toasts
• Ledger connection errors show error toasts
• Settings actions show feedback toasts
• Bottom navigation padding adapts to device safe areas
• No Alert dialogs remain in the app

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