fix: update Open Graph and Twitter meta tags for improved social shar…

[devaraj3]

Fix stale social share preview (og:title, twitter:title, og-image.png)

The link preview shown when cadviewer.xyz is shared was showing a
screenshot of the pre-redesign UI with leftover internal-sounding copy
("Standalone CAD-only viewer with migrated advanced CAD capabilities")
baked into the image, and a title that didn't mention 2D drawing
generation.

What changed

• og:title / twitter:title updated to match the current homepage title
• og-image.png regenerated at 1200×630 using current design tokens
  (brand mark, IBM Plex, blue/ink palette) and real hero imagery —
  reflects the actual live product, not a mockup
• Added a cache-busting query string to the image URL so platforms that
  already cached the old preview (Slack, etc.) fetch the new one instead
  of waiting out their cache TTL

Verified

• About page and both guide pages already set their own accurate
  og:title and don't override og:image — confirmed they inherit the
  fix automatically, no changes needed there

Not done, deliberately

• og:description / twitter:description left untouched — not stale,
  out of scope for this fix

After merging

This only takes effect once actually deployed — the site is currently
still serving the old preview. After it's live, re-check with Facebook's
Sharing Debugger or LinkedIn's Post Inspector (both have a "scrape again"
action) to confirm the new card renders.

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Project	Deployment	Actions	Updated (UTC)
cad-viewer	Ready	Preview	Aug 24, 2026 4:24pm