feat(booth): copy-id button on the pickup banner (v0.1.3)

Adds a "⧉ copy" button next to the pickup id that copies the id to the
clipboard (flips to "✓ copied"). The Booth serves over plain HTTP on a LAN IP,
where navigator.clipboard is undefined (secure-context only) — so the handler
falls back to a hidden-textarea execCommand('copy') that works over HTTP.
Verified on the LAN-IP (non-secure) path: isSecureContext=false, clipboard API
absent, button state flips, no errors. Reusable via any .copy-btn[data-copy].

services/booth/pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "booth"
-version = "0.1.2"
+version = "0.1.3"
 description = "The Booth — a dead-simple standing web server that scans a data dir of drop-folders and renders each as an ephemeral media 'booth' (image/webm/audio auto-gallery, or a folder's own index.html verbatim). Also accepts browser/curl uploads for pickup under a human-readable id. 24h TTL, then the folder is wiped. Fleet tool for CC sessions to surface A/B and smoke results to the operator."
 requires-python = ">=3.11"
 dependencies = [