fix: update favicon dimensions and add structured data for SEO

[devaraj3]

What changed

• Added a new WebSite JSON-LD structured data block to index.html (separate from the existing SoftwareApplication block — both now present) with "name": "CAD Viewer"
• Added <meta property="og:site_name" content="CAD Viewer" /> to index.html
• Tightened public/favicon.svg's viewBox from 0 0 32 32 to 5 5 22 22 — same artwork, no redrawing, just cropped in closer so the logo fills more of the circle when Google (or any consumer) crops it, instead of floating in a lot of empty margin

Why

• Google was showing the raw domain (cadviewer.xyz) instead of "CAD Viewer" as the site name in search results. Per Google's own developer documentation, WebSite structured data is the strongest signal for this — which the site didn't have yet
• The favicon looked small with excess white space when Google cropped it into a circle in search results. Confirmed locally (rendered the actual current SVG in a circular mask) before making any change, then compared against the tightened version to verify the fix actually looks right — no guesswork

Validation

• npm run lint
• npm run typecheck
• npm run build
• Favicon fix visually confirmed locally by simulating Google's circular crop on both the old and new viewBox before committing
• Live check after deploy: view-source on https://cadviewer.xyz/ confirms both the new JSON-LD block and og:site_name tag are present
• Live check: browser tab icon and any bookmark icon still render correctly, not cropped oddly (SVG viewBox change affects all consumers, not just Google)

Notes

• The site name change in Google's actual search results cannot be verified immediately — per Google's own documentation, this is fully automated on their end and can take days to weeks to update, with no guarantee our preferred name is what gets selected. This PR sends the correct signal; the rest is out of our control
• The favicon change, by contrast, is fully verifiable right now, and was checked before writing this description

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Project	Deployment	Actions	Updated (UTC)
cad-viewer	Ready	Preview, Comment	Jul 26, 2026 3:03pm