fix: regenerate corrupted lockfile and fix setTimeout type mismatch

package-lock.json had a corrupted entry from the recent merge that made
npm install fail with "Invalid Version" — regenerated it from scratch
(no dependency version changes, same package.json).

search.test.ts: ReturnType<typeof setTimeout> resolves to Node's Timeout
type here (a TS overload-resolution quirk — ReturnType picks the last
overload, while the actual browser call resolves to the first/number
overload). Typed timer as number directly to match what the call
actually returns.

tsc --noEmit, next build (31 routes), and jest (28/28 tests) now pass
clean.

Author: Kingsman-99