Add landing page, animated background, light mode viewer, file picker…

[devaraj3]

What this PR does

Landing page

• New landing page at / with animated grid background and scan effect
• "Upload CAD File" button opens file picker directly — no double-click needed
• Drag-and-drop from landing page navigates to viewer with file pre-loaded
• Animated background: flat 2D grid with blue scan light sweeping top-to-bottom

CAD Viewer

• Viewer switched to light mode (grey canvas background, light toolbar)
• Drag-and-drop works directly on the viewer canvas too
• Custom loading overlay with file name, size, stage label, and progress bar

Performance

• Render-on-demand: GPU no longer renders at 60fps when camera is still
• three-mesh-bvh: fast raycasting for measurements on large meshes
• Geometry merging: draw calls reduced from thousands to single digits
• Adaptive tessellation: large files use coarser mesh for faster load
• IndexedDB cache: same file loads instantly on second open (no retessellation)
• Progressive rendering: assembly parts appear one-by-one as they tessellate

Routing

• React Router wired: / → Landing, /viewer → Viewer, * → 404
• fileStore module passes dropped/picked file across route navigation

[vercel]

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Project	Deployment	Actions	Updated (UTC)
cad-viewer	Ready	Preview, Comment	May 17, 2026 11:08am