Band creation now starts with a Nextcloud credentials step when
storage is not yet configured. Users can save NC credentials
(or skip) before proceeding to band name/slug/folder entry.
- StorageStep: NC URL, username, app password; PATCH /auth/me/settings
- BandStep: name, slug (auto-generated), NC folder with warning when NC not set
- StepDots: animated pill indicators for current step
- Modal fetches /auth/me on open to determine starting step
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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