fix(search): preserve quoted exact matches

[Rjected]

Adds explicit parsing for direct search-box input before building the SQLite FTS5 MATCH expression. Unquoted terms keep the existing prefix-search behavior, while quoted terms are sent as exact FTS phrases so searches like "bal" no longer use the broad bal* prefix query that can match identifiers such as balanceOf.

The query builder also wraps the title-scoped expression in parentheses so title prioritization applies to the full search expression, and it returns no results for empty quoted input instead of sending an empty MATCH query to FTS5.

Validation:

• npx tsx --test src/lib/SearchQuery.test.ts
• npx pnpm@10.33.0 check:types
• npx pnpm@10.33.0 check

Note: a full npx pnpm@10.33.0 test run currently fails during Vite startup because the Cloudflare Vite plugin rejects the configured resolve.external values before tests execute.