feat(mobile): Create transaction status UI components

[rafamiziara]

Overview

Create UI components for displaying pending transaction status and progress.

Tasks

Pending Transaction Banner

• Create components/PendingTransactionBanner.tsx
• Show count of pending transactions
• Display on relevant screens (pools list, home)
• Handle click to show transaction details

Transaction Status Modal

• Create components/TransactionStatusModal.tsx
• Show transaction progress (submitting → submitted → confirmed)
• Display transaction hash with blockchain explorer link
• Show success/error messages
• Allow dismissal after completion
• Add loading indicators for each stage

Acceptance Criteria

• Banner shows accurate pending transaction count
• Modal displays clear transaction progress
• Explorer links work for all supported chains
• Proper visual feedback for each transaction state
• Components integrate with PendingTransactionsStore

Related Documentation

• See docs/POOL_CREATION_ARCHITECTURE.md Component Architecture
• See docs/POOL_CREATION_TASKS.md Tasks 17-18

Labels: comp: frontend, type: feature

Milestone: Sprint 3: Pool Creation

Part of Epic: #35