Adds an "Install missing for picks" toolbar button to the Nodes section.
On click it walks the user's curated picks against Manager's
/customnode/getmappings, buckets them into already-installed /
will-install / unresolved, queues each unique git URL through
/customnode/install/git_url, polls /manager/queue/status to drive a
progress bar, and prompts to reboot — collapsing what was previously
a per-node "open node, let Manager prompt, click install, restart"
loop into a single confirm-and-go flow.
New `web/sidebar/installer.js` holds the Manager-API client (detect /
mappings / queue / poll / reboot) plus the picks → installs resolver.
The modal in `web/sidebar/modals.js` drives the four-phase UI
(discovery → confirm → progress → result) and surfaces 403s as
actionable language ("your security level forbids git-URL installs")
rather than raw HTTP. Falls back to a clipboard URL list (with a
`comfy node install` hint) if Manager isn't reachable.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
