* feat(vocabulary): tag search, tag sort and an Untagged prompts entry (#444)
Tags & categories gains a server-side tag search and sort (keyset pages,
cursor scoped to the query) and an "Untagged prompts" row whose Browse opens
the Library with tag_mode=untagged. Refine this view gets Tag match, saved
Library views keep it, and the routes echo the applied query so a stale
server is an error, never an unfiltered list. Recorded as D149.
Refs #444
* test(saved-views): give the D153 Library view the tag_mode key (#444)
The Library saved-view state now holds tag_mode, and the API requires
every key, so main's new "Highest rated" spec posts it too.
Refs #444
Vito
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