Next.js v16.2.0-canary.70: Devtools, Prefetch Bundling, Cookies v16.2.0-canary.70

Canary's cooking. Devtools overlay stops blocking error details copy, prefetchInlining now bundles segment prefetches into single responses (lowkey huge for perf), instant() fixed cookie handling on fresh loads, and modifyConfig adapter hook gets nextVersion passed through. Shoutout to eps1lon, devjiwonchoi, pieh, and acdlite for the help.