Performance: Defer 3D model loading until explicit user interaction t…

[pradeep0153]

Closes #400.

Description

This PR executes a massive performance optimization across the entire application architecture, resolving catastrophic Time to Interactive (TTI) delays on the Product Display Page (PDP) caused by the eager loading of massive WebGL 3D models.

Changes Made

• Performance Profiling: Audited the initial load sequence of the PDP utilizing Google Lighthouse. Discovered that the <ProductViewer3D /> component was aggressively fetching and parsing massive 15MB+ .gltf and .usdz 3D model files the exact millisecond the page mounted.
• The Core Vulnerability: Eagerly loading a massive 3D payload on initial render completely maxes out the browser's memory allocation and forces the CPU to dedicate all resources to WebGL parsing. This violently blocked the main thread for upwards of 8 seconds on mobile devices, preventing users from scrolling, tapping buttons, or interacting with the page in any way until the invisible 3D model finished loading.
• Lazy-Load Orchestration: Executed a strict lazy-loading architectural shift for the WebGL engine (Three.js/React Three Fiber).
• Interactive Fallback: The component now strictly renders a highly optimized, static, high-resolution 2D fallback image on initial page load, overlaid with a prominent "Load 3D Interactive View" button.
• Deferred Initialization: The massive .gltf payload is only fetched, and the heavy WebGL canvas is only initialized, when the user explicitly clicks that button to request the 3D experience.

Impact

• Core Web Vitals & Conversion Rate: A premium furniture buyer shouldn't have to wait 8 seconds for a web page to become usable just because an optional 3D model is downloading in the background. A blocked main thread creates an infuriating, laggy experience that directly causes massive bounce rates. By deferring this heavy computation until explicit user interaction, we force the browser to prioritize rendering the HTML, CSS, and critical React UI first. This completely unblocks the main thread, resulting in a near-instantaneous Time to Interactive (TTI), skyrocketing our Core Web Vitals, and providing a flawlessly fast shopping experience while preserving the high-end 3D functionality for users who specifically request it.

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