The "New band" button in TopBandBar previously navigated to the HomePage
which immediately redirected back if any bands already existed, making it
impossible to create additional bands.
Replaced the navigation with an inline modal that:
- Opens directly from the "New band" button in the band switcher dropdown
- Fields: band name (with auto-slug), slug, Nextcloud folder path
- NC folder input shows placeholder based on current slug, links to
Settings → Storage so the user knows where to configure Nextcloud
- Validates: disabled submit until name + slug are filled
- On success: invalidates band list cache and navigates to the new band
- Closes on backdrop click or Escape key
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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