feat(web): debounced search, kind/status filter chips, no-match tip (BEN-51)

[benSepanski]

Context

src/web/Search.tsx only searched on Enter, lacked filters, gave no result counts, and the no-match copy didn't explain how matching works. (Linear: BEN-51.)

TL;DR

Search updates as you type (250 ms debounce), exposes kind/status filter chips, summarises matches, and explains substring matching when nothing hits.

Summary

• Debounce input → query at 250 ms; sync URL via replaceState while typing and via location.hash on Enter for shareable links.
• Result header: N matches across X runs · Y turns · Z events, with · showing K when filters narrow.
• Filter chips for turn / event and per-status, derived from the result set; all filtering is client-side over the existing /api/search payload (no extra request).
• No-match state now includes a one-line tip ("case-insensitive substring matches over turn content and event payloads").
• Extracted pure helpers (summarizeMatches, filterMatches, availableStatuses, toggleSetMember) into searchUtils.ts with 12 vitest cases.

Demo

n/a — automated cron run with no UI capture; pnpm build:web succeeds and pnpm all is green. Manual QA recommended on the four canonical journeys before merge (empty / live / failed / past).

Alternatives

• Keep submit-only search and add filters next to the button — rejected; the ticket explicitly calls out debounced typing as the expected interaction.
• Push filter state into the URL — rejected as scope creep; chips reset on reload, which matches the "narrow within a session" intent.
• Add date-range filtering — deferred; the API has no time window today, so it would be backend work outside this ticket.

Test Plan

• pnpm all — typecheck + fmt:check + lint + test + eval (163 tests pass)
• pnpm build:web — web bundle builds (234 kB JS, 23 kB CSS)
• Manual: type in #/search, confirm results settle without Enter; toggle chips; clear input; verify no-match tip on a query with zero hits.

https://claude.ai/code/session_01Bgm49aWQpv2a6mmddCgW6U

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