v15.4.0-canary.49

Core Changes

• fix(dev-overlay): Better handle edge-case file paths in launchEditor: #79526
• [build-sourcemaps] Increase stacktrace limit during prerender: #79498
• fix: Rspack not skip .d.ts file: #79285
• Revert "[next-server] skip setting vary header for basic routes": #79426

Misc Changes

• Update Rspack production test manifest: #79484
• Update Rspack development test manifest: #79485
• Update Turbopack production test manifest: #79487
• Update Turbopack development test manifest: #79488
• docs: Rename CSS snippet to blog.module.css: #79507
• add feature flag to verify aggregation graph: #78964
• Turbopack: leave chunks in rscModuleMapping empty: #79511
• [release] use changesets/action for release-candidate: #79039
• [release] notify release status via slack: #79409
• refactor(turbopack): Refactor usage of visitors: #79525
• [turbopack] Fix the stubbed out implementation of signature so that it works in a web worker.: #79509
• fix(next-swc): Fix interestingness detection for React Compiler: #79499
• perf(turbopack): Remove extra indirection: #79553
• refactor(turbopack): Remove PassFactory: #79555
• Fix build and deploy workflow: #79569
• Add final build job to validate: #79570

Credits

Huge thanks to @bgw, @eps1lon, @icyJoseph, @sokra, @mischnic, @devjiwonchoi, @kdy1, @lukesandberg, @SyMind, @ijjk, and @gaojude for helping!