Perforrmance search functionality code quality improvement

[dot-enny]

Description

Brief description of changes
Race Condition Prevention: Integrated AbortController into the core asynchronous useSearch hook. Now, if the user continues to type while a request is actively in-flight, the old request is safely aborted. This completely prevents UI glitches caused by out-of-order network resolutions.
Zero-Latency Caching: Implemented a local request caching layer inside the hook. Previously, backspacing to an older query would re-trigger a slow network roundtrip. Now, hitting a previously searched query returns the data instantly with 0ms network latency.
Render Performance Boost: Discovered and fixed a performance issue in IntelligentAutoComplete.tsx. It was previously running its intensive getSearchSuggestions filter algorithm completely synchronously on every single component render (e.g. even when simply scrolling through the dropdown using the arrow keys). This is now wrapped in a useMemo block, strictly tying the calculation to string input changes!
Test Suite Added: Built a dedicated unit testing suite at src/hooks/tests/useSearch.test.tsx utilizing robust timer simulations. All tests passed, specifically asserting that the abort signal executes correctly on back-to-back triggers and that the network cache bypasses API calls properly.

Related Issue

Closes #506

Type of Change

• Bug fix
• [ X ] New feature
• [ X ] Breaking change
• Documentation update

Checklist

• [ X ] Code follows project style guidelines
• [ X ] Self-review completed
• [ X ] No console errors
• [ X ] Uses Lucide icons consistently
• [ X ] Responsive design implemented
• [ X ] Starknet best practices followed

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