fix(hub): Create Group wizard steps app selection before the scan wait

"Choosing applications" 404ed with "Group not hosted on this node" on
any real (multi-thousand-file) library — found live creating a group
against a 5787-file MP3 collection while testing the Music app.

daemon.py registers a brand-new group in groups_ctx only once its
initial scan finishes (ui/app.py's index-status docstring already
says so); nothing group-scoped can succeed before that, however many
times it's retried. The wizard's apps step ran *before*
platform.waitForGroupHosted() (which correctly waits up to 30 minutes
for exactly this), protected only by a 5×400ms withRetry meant for a
sub-second race — nowhere close to covering a real scan. The stated
reason for running it early (so a mid-scan joiner never sees a
not-yet-disabled app) doesn't hold either: nobody can join before the
group is hosted, same gate.

Fix: move the apps step after waitForGroupHosted, matching where the
roots/GEK steps already correctly run. No node-side change — the
scan-then-register ordering in daemon.py is intentional and untouched.

npm run sync-ui re-run to propagate to the Electron client. Hub suite:
429 passed, no regressions.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KBi7ALLGfwcjBXt57yNMcy

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