(extracted from ISH-808)

Backend

• Migrate to OpenAPI 3.1 (blocked on ref)
• Switch to WebSocketStream - ref
• Switch to named EF query filters - ref
• Switch to new blazor script loading method - ref
  • looks like this requires us to ditch the old cshtml / razor pages entirely (after doing this: remove environment shenangians in FrontendSPA.razor or equivalent)

Frontend

• NavigateTo no longer resets viewport ref, verify functionality & trim now-unneeded code
• Enable client-side fingerprinting - ref
• Switch to new JSInterop features - ref
• Use new local-url detection - ref
• Switch to the new JS interop features - ref
• Use improved NotFound handling - ref
• Use static asset preloading - ref, ref
• Use improved form validation - ref
• Enable improved PWA/SW registration - ref