Fix Edge template: @{{ handle }} renders literal instead of @<handle>
Edge treats `@{{ expr }}` as its escape syntax for the `{{ expr }}`
interpolation — the `@` is consumed as part of the escape, so the
template renders literal "{{ handle }}" instead of "@dril.bsky.social".
This was wrong in loading.edge, gone.edge, show.edge, and not_found.edge
(8 call sites total).
Fix by putting the literal '@' inside the interpolation expression:
{{ '@' + handle }} — a single interpolation with no escape foot-gun.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>