[KrimsN]

Summary

• Add a "Can't find your service?" button to the provider, address (retriever) and notification (notifier) blocks. It opens a window with the fields of the matching dnspatch issue form.
• The button opens the form on GitHub already filled in; the person checks it and submits there. The page sends nothing itself and needs no token. GitHub cannot prefill a dropdown from the URL, so each kind has its own form.
• Fix the windows closing when a text selection ends with the mouse released outside: a window now closes only when both the press and the release land on the dimmed area. This also fixes the build helper window.

Linear: Part of DNS-59

Depends on dnspatch/dnspatch#86 (the provider_request.yml, retriever_request.yml and notifier_request.yml forms). Until it is merged the links open an empty form, so merge that one first.

Test plan

• tsc, biome, unit tests, e2e (a filled-in link per kind, window closing)