feat: implement hardware-accelerated live preview transformations

[SatyaViswas]

Description

This PR introduces a complete architectural upgrade to the core video display layer inside src/components/VideoPreview.tsx, enabling a real-time, high-fidelity WYSIWYG (What You See Is What You Get) interface.

Key changes include:

• Dynamic Canvas Crop Mask: Replaced the static, hardcoded rendering boundaries with an absolute percentage positioning system calculated dynamically from active editing parameters. The viewport accurately scales to all dimensions (including vertical configurations like 9:16 / 4:5 and panoramic modes like 47:10) without warping the application dashboard layout.
• Real-Time Transformation Rendering: Bound state parameters for rotation, framing styles (fit vs fill), and micro-level color corrections directly to native hardware-accelerated CSS style overrides on the local player tracking node. Adjusting settings instantly cascades visual feedback onto the workspace preview without requiring an intermediate export cycle.
• Visual Canvas Contrast Isolation: Added a subtle contrast separating border configuration (ring-1 ring-white/10 shadow-2xl bg-black) outlining the dynamic canvas window. This explicitly defines pixel-accurate output frame regions even when manipulating dark source footages that match underlying dark-mode panels.
• Redundant Logic Pruning: Cleaned up obsolete overlay simulation elements and reference states, keeping the presentation layout lightweight, accessible, and performant.

Related Issue

Fixes #653

Type of Contribution

• Bug fix
• New feature
• Documentation update
• Refactor
• GSSoC contribution

Participant Info

• GitHub username: @SatyaViswas
• Contribution level (Beginner/Intermediate/Advanced): Advanced

Screen Recording

Screen.Recording.2026-05-26.at.6.03.45.PM.mov

Checklist

• I have read the contribution guidelines
• My changes follow the project structure
• I have tested my changes in Chrome, Firefox, and Safari
• bun run lint passes (no ESLint errors)
• bunx tsc --noEmit passes (no TypeScript errors)
• New interactive elements have aria-label / accessible names
• No console.log statements left in
• This PR is related to a valid issue
• Screen recording attached above (required for UI/feature/design changes)

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