… prerender-missing-suspense error (#79247)

One of the important resources for this message is `cacheLife` and
`cacheTag`, but the links were missing, and the snippet omitted imports,
which newcomers won't know how to import unless looking up.

)

Without this change, right clicking on the indicator starts the drag action, which leads to janky behavior with the native browser context menu.

Only allow dragging with the primary mouse button.

I also tested this in the mobile simulator mode to make sure I didn't break anything there.

While investigating an issue with intermittent `unstable_cache` calls
failing to set noticed we have these dangling promises which cause
"racey" behavior with setting to a cache in environments where the
function stops after the request is finished.

These have been present since
b305c2d
altho since racey may or may not have been noticed.

x-ref: [slack
thread](https://vercel.slack.com/archives/C02K2HCH5V4/p1747322956802819?thread_ts=1746633220.634939&cid=C02K2HCH5V4)