v15.4.0-canary.65

Core Changes

• [dev-overlay] Remove unnecessary code from /pages dev error boundary: #79983
• Turbopack Build: Implement helpful error for missing sass package: #80155
• [global-not-found] fix shared css imports not being picked: #80151
• Add experimental flag for RSC request validation: #80157

Credits

Huge thanks to @eps1lon, @timneutkens, @huozhi, and @acdlite for helping!