feat(admin): redesign library management with HTMX expandable rows + stats dashboard
Library management:
- Redesign admin_library page with expandable rows that load detail
panels via HTMX (LibraryList, LibraryPanel, FolderBrowserContent partials)
- Add create/edit/delete library modals using data-* attributes
- Add folder browser modal with inline add/remove via HTMX
- Add user visibility checkboxes toggled via HTMX
- New endpoints in admin_library.go: create, update, delete, panel,
folders add/remove, browse, visibility
- New template types: FolderData, DirEntry, UserVisibilityData,
AdminStats; extend LibraryData with TypeValue and FolderCount
Admin dashboard:
- Rewrite admin.templ to show 4-stat grid (libraries, media, users, devices)
- Add getAdminStats helper querying library/user/media/device counts
- Pass AdminStats to template from both /admin and /admin/ handlers
john-okeefe
706be09dec