chore: add confirmation dialog

[andypols]

Summary

This PR adds a delete confirmation dialog to prevent accidental repository deletions.

Background

I unintentionally deleted a repository after clicking “Delete” while moving the mouse toward the “Code” button. To avoid similar mistakes, this PR introduces a confirmation step before deletion.

Fix

• Adds a confirmation dialog when deleting a repository.
• Requires the user to type (or paste) the repository name to confirm the action.
• Follows the standard UI convention used for similar destructive actions.

The delete button is enabled when the correct repo name has been added.

Note

There’s a quirk where you can’t remove the default repository. Right after a repo is deleted, the handler restarts the proxy, and during that restart, proxyPreparations() runs again — which re-inserts every repo defined in proxy.config.json. If the repo you deleted is listed there, it’s immediately recreated, so the UI still shows it even after a refresh.

[netlify]

✅ Deploy Preview for endearing-brigadeiros-63f9d0 canceled.

Name	Link
🔨 Latest commit	573336a
🔍 Latest deploy log	https://app.netlify.com/projects/endearing-brigadeiros-63f9d0/deploys/69087c02b4f8e10008811925

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.36%. Comparing base (a0e5bcc) to head (573336a).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1267   +/-   ##
=======================================
  Coverage   83.36%   83.36%           
=======================================
  Files          70       70           
  Lines        3005     3005           
  Branches      499      499           
=======================================
  Hits         2505     2505           
  Misses        397      397           
  Partials      103      103           

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[jescalada]

LGTM! 🚀