[MarkPhamm]

Fixes #98

Cause. Both live viewers on the home page (the AdventureWorks DW tour and the dbt yml demo) are the real viewer in a same-origin iframe, so the canvas took every wheel event as zoom.

Fix. home.js wheelScrolls(ifr, stage), called by home-tour.js and home-embed.js once the iframe loads:

• A capturing wheel listener on the iframe's window. A plain wheel over #canvas scrolls the home page instead.
• Ctrl/⌘ + wheel and trackpad pinch (a ctrl wheel) still zoom.
• The details panel and the explorer list still scroll as before.
• A short "Use ⌘ + scroll to zoom" tip shows over the diagram (Ctrl off Mac), and the viewer's footer hint says the same.

The standalone viewer is unchanged: wheel zoom stays there.

Not changed

• I couldn't reproduce the 7% start or the minimap under the details panel at 1126x800: the tour opens at 90% and the dbt demo at 100%, with the minimap beside the panel. I left both alone.

Verified. Playwright, system Chrome, 1126x800, local mkdocs build + gallery:

	before	after
tour, 3 plain wheels	90% -> 23%, page moved 0px	stays 90%, page moved 400px (2 wheels), tip shown
dbt demo, 3 plain wheels	100% -> 26%, page moved 0px	stays 100%, page moved 400px (2 wheels), tip shown
Ctrl + wheel	zooms	zooms (90% -> 33%, 100% -> 37%)

[github-actions]

Schema changes: origin/main → working tree

No schema changes.

_{Interactive diagram with changes highlighted: download the erd artifact from this run. Generated by qdbd.}