Core Changes

• Revert "Handle null history.state in client-side router popstate handler": #90268
• [devtools] Omit empty looking error messages: #90256

Misc Changes

• [test] Improve fetch timeout error stack for act: #90261
• Turbopack: add Rope.content_hash and SHA hashing: #90235
• [instant] Handle more instant declaration patterns: #90251

Credits

Huge thanks to @unstubbable, @mischnic, @ztanner, and @eps1lon for helping!