Fix/loading spinner issue 192

[Great-2025]

Problem Description
Users reported that loading spinners were not appearing during various data fetching operations, including:

Initial data loading
Search operations
Filter changes
CSV export functionality
Data refresh operations
This caused confusion and poor UX as users couldn't tell if the system was processing their requests.

🔍 Root Cause Analysis
Inconsistent Loading Implementation: Components used different loading patterns
Custom Spinners: Some components had custom SVG spinners instead of using the centralized Loading component
Missing Loading States: Several async operations lacked proper loading indicators
No Inline Feedback: Operations like search and export had no visual progress indicators
✅ Solution Overview
🎯 Key Changes Made

1. Enhanced TransactionHistory Component
   ✅ Replaced custom spinner with centralized Loading component
   ✅ Added search loading indicator with inline spinner in search input
   ✅ Added export loading state with visual feedback on export button
   ✅ Added inline loading indicator for data refresh operations
   ✅ Improved loading states for better UX during all data operations
2. Updated PaymentForm Component
   ✅ Replaced custom SVG spinner with centralized Loading component
   ✅ Maintained consistent loading experience across payment flow
3. Created Reusable Loading Hooks
   ✅ New useLoadingState hook for consistent loading state management
   ✅ useAsyncLoading hook for async operations with built-in error handling
   ✅ Reusable patterns for future component development
   closes Bug: Loading spinner not showing during data fetch #192

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