Fix: search redirecting early and missing full tank names

**Enter key**
- Enter redirected to the previous results' first tank while a search was still buffering, because the key handler captured a stale `searching` value.
- Enter on an empty field redirected to the first tank of the unfiltered list (Sheridan).
- The handler now reads live filter state and only acts when there is a settled search, matching the quick-link button.

**Full names in search**
- Search only knew short tank names, so queries like "super pershing" found nothing when the game stores a short form.
- Add an optional `name_full` to `TankDefinition`, filled from the game's full name when a short name exists, and index it (plus an accent-stripped copy) in `fetchTankNames` / `SEARCH_KEYS`.
- Displayed names are unchanged. Full names become searchable once the definitions are regenerated on the next build.

packages/website/src/components/TankSearch/components/SearchBar.tsx

@@ -46,7 +46,8 @@ export function SearchBar({ topResult, skeleton, onSelect }: SearchBarProps) {
   }, [searching]);
   const handleKeyDown = useCallback<KeyboardEventHandler>(
     (event) => {
-      if (event.key !== "Enter" || !topResult || searching) return;
+      if (event.key !== "Enter" || !topResult) return;
+      if (!TankFilters.state.search || TankFilters.state.searching) return;
 
       event.preventDefault();