TypedRoutes doesn't work with trailingSlash config

Link to the code that reproduces this issue

https://github.com/damianfrizzi/next-typed-routes-bug

To Reproduce

1. Clone repo
2. Run bun run tsc

Current vs. Expected behavior

The typedRoutes config seems to not respect trailingSlash config. If trailingSlash: true I'd expect the generated routes to contain a trailing slash but they don't.

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:40 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T6041
  Available memory (MB): 49152
  Available CPU cores: 14
Binaries:
  Node: 22.15.0
  npm: 10.9.2
  Yarn: N/A
  pnpm: N/A
Relevant Packages:
  next: 15.5.2 // Latest available version is detected (15.5.2).
  eslint-config-next: N/A
  react: 19.1.0
  react-dom: 19.1.0
  typescript: 5.9.2
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

Linking and Navigating, TypeScript

Which stage(s) are affected? (Select all that apply)

next dev (local), next build (local)

Additional context

I tested my reproduction against v15.5.1-canary.16 and 15.5.2.

Start by cloning the linked reproduction repository and running bun run tsc with trailingSlash: true. No project file or test is named in the issue, so trace the typedRoutes route generation from the TypeScript error or generated output. Done means generated routes include trailing slashes and the reproduction type-checks successfully.