v15.6.0-canary.49

Core Changes

• Upgrade React from c7862584-20251006 to a4eb2dfa-20251006: #84589

Misc Changes

• fix(cna): use correct postcss plugins syntax: #79949
• Turbopack: absolute requests in webpack loader: #84575

Credits

Huge thanks to @stefanprobst and @mischnic for helping!