fix: support URLs with ~/edit tilde format

[AriPerkkio]

The URLs may also contain a ~ before the /edit part. Adds support for such URLs.

Fix was 100% written by Github Copilot. I wrote the test case. Perfect workflow. 🤝

Fixes errors like

npx stackblitz-zip https://stackblitz.com/~/edit/vitejs-vite-xo4mmgt9
❌ Error: Invalid StackBlitz URL: https://stackblitz.com/~/edit/vitejs-vite-xo4mmgt9

Both of these format should work:

• https://stackblitz.com/~/edit/nuxt-starter-k7spa3r4
• https://stackblitz.com/edit/nuxt-starter-k7spa3r4

[danielroe]

😆

the review, was also entirely human

thank you ❤️