v15.6.0-canary.3

Core Changes

• fix: dev should produce the correct default fallback regex to match builds/Turbopack: #83701
• [devtool] fix overlay styles are missing: #83721
• Revert "Remove clientParamParsing requirement from RDC for Navigations": #83725
• Only enable unhandledRejection filtering when opted in: #83726

Misc Changes

• tests: disable flaky deployment test while investigating upstream: #83705
• [test] Update snapshots for Rspack + React 18: #83712
• Docs/sep paper cuts: #83689

Credits

Huge thanks to @ztanner, @unstubbable, @icyJoseph, @huozhi, and @gnoff for helping!