perf: implement IntersectionObserver lazy loading wrapper for chat attachments (#347)

[prakshithamalla-art]

Closes #347

Changes Made:

• Lazy Loading Component Architecture: Developed a reusable component wrapper (frontend/src/components/chat/LazyMedia.jsx) leveraging the native Web IntersectionObserver API.
• Viewport Boundary Interceptions: Gated outbound network requests for <img> and <audio> attachment elements. Assets remain un-rendered as structural lightweight skeleton placeholders until the specific message frame approaches the active scrolling window layout parameters.
• Pre-fetch Buffer Optimization: Configured a proactive 200px root margin offset barrier to dynamically fetch assets immediately prior to visual boundary impact, maintaining a seamless, zero-lag rendering UX.
• Bandwidth Minimization: Greatly reduces initial timeline hydration sizes, cuts downstream network transport payloads, and frees browser main execution threads on mobile viewports loaded with deep historical media logs.

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Reviewing files that changed from the base of the PR and between 29c9c86 and 2a8e839.

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• frontend/src/components/chat/LazyMedia.jsx

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[prakshithamalla-art]

@UTKARSHH20 please check it and merge it