- PromptDatabase.suggest_tags(prefix, with_tags, limit): tags starting
with the prefix, counted over the prompts that carry every context tag,
context tags excluded, ordered by count then name; LIKE wildcards in the
prefix are escaped
- GET /prompt_manager/tags/suggest?q=&with=&limit= exposes it (limit
clamped to 1..50, context capped at 10 tags, registered before the
{tag_name} routes)
- tag-autocomplete.js splits the comma-separated input into committed tags
and the one being typed, builds the query, applies a pick and handles
wrap-around keyboard selection
- the dashboard Tags box shows suggestions with counts on focus and while
typing, arrow keys and Enter/Tab pick, Escape closes, and each pick
immediately offers the next tag narrowed by the previous ones