Implement IDisposable in BlazorWebWasmLogClient

[Copilot]

Description

Addresses resource leak in BlazorWebWasmLogClient which creates an HttpClient but never disposes it, potentially causing socket exhaustion.

Changes

• BlazorWebWasmLogClient: Implements IDisposable with Dispose() method to clean up HttpClient resource
• AssetCachingTests: Uses using statement for automatic disposal

// Before
var requestLogClient = new BlazorWebWasmLogClient(baseUrl);

// After
using var requestLogClient = new BlazorWebWasmLogClient(baseUrl);

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