TagAutocomplete: kind selector + debounced (200ms) search + keyboard nav
(up/down/enter/esc). When the operator types a character that doesn't
exist, the create flow first opens FandomPicker so the new character tag
lands with a valid fandom_id (otherwise the API rejects it).
FandomPicker lists existing fandoms (cached after first load) with an
inline create-new affordance, so the operator never has to leave the modal
to manage fandom hierarchies.
Tag store also exposes a kind→icon→color mapping that the TagPanel reuses
in Task 22 — keeping chip colors visually distinct per kind without per-app
accent collisions.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusenandClaude Opus 4.7
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