- helpers.go: Promote getText() from a local closure in frontend.go
to a package-level function so it can be used by resolveLibrary.
Add resolveLibrary(c, cfg, user.ID) helper that:
1. Reads library_id query param (explicit navigation wins)
2. Falls back to selectedLibrary cookie — validates __all__
sentinel or real UUID, rejects garbage values silently
3. Falls back to user's first visible library
Returns LibraryResolution struct with LibraryID, IsAll, LibUUID,
Libraries, and FirstID — eliminating repeated boilerplate across
all SSR routes.
- frontend.go: Replace manual library resolution boilerplate in 5
SSR route handlers (series, tags/detail, bookshelf, dashboard,
collections/:id) with resolveLibrary(). Each route now gets cookie-
aware library selection for free. Collection detail correctly
handles All Libraries mode for both system and user collections.
Dashboard no longer makes a redundant second GetUserVisibleLibraries
call.