Optimize API usage and 3D cube refresh lifecycle

[QuirkyRobots]

Motivation

• Reduce unnecessary network requests and rendering churn to improve performance and memory usage.
• Avoid duplicate exchange-rate fetches triggered by the UI and ensure UI event handlers are attached reliably.
• Prevent GPU memory leaks when rebuilding the Three.js cube by disposing unused textures/materials and caching environment resources.

Description

• Derived isPrivacyCoin from the CoinGecko payload in extractCoinData and replaced the extra fetch with updatePrivacyCoinIndicator, removing the redundant CoinGecko round-trip (modifies js/api-manager.js).
• Simplified the Search button flow to call window.getExchangeRate() once and only update URL params, preventing duplicate network calls and extra state churn (modifies js/ui-controller.js).
• Ensured music mute toggle handler is wired during UI initialization by calling setupMusicMuteToggle() from initializeUI (modifies js/ui-controller.js).
• Cached the environment map returned by createEnvironmentMap() and added a disposeCube() helper that disposes geometry, material maps, and materials when replacing the cube; refreshCube() now removes the old cube, creates a new one and disposes the old resources (modifies js/object-renderer.js).
• Minor API and geometry signature cleanup (e.g., removed unused parameter from createCubeGeometry).

Testing

• Ran static syntax checks with node --check js/api-manager.js, node --check js/ui-controller.js, and node --check js/object-renderer.js, all of which completed successfully.
• Verified the working diff and committed changes locally with git commit (commit created successfully).

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Codex Task

[cloudflare-workers-and-pages]

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