feat(workflow): filter-row editor for database Query args

[simlarsen]

Turns hand-written database queries into simple filter rows. Stacked on #2614.

What

Database Query arguments (Find / Delete records) were hand-written JSON. This edits the common case — flat equality filters — as rows: a field, a value, and an explicit type.

• Pure QueryFilterUtils keeps each value's JSON type via a per-row type selector (Text / Number / True-False), so it serializes to exactly the query object an author would hand-write — a number stays a number, a boolean stays a boolean. The stored value remains a JSON string, so the server parses it identically. Byte-safe.
• QueryFilterInput renders the rows with an "Edit as JSON" escape, and starts in JSON mode automatically when the query isn't a flat equality — operator objects like {"createdAt":{"_type":"GreaterThan",…}}, arrays, or invalid JSON — so existing advanced queries never regress.
• ArgumentsForm routes Query to it (removed from the JSON-editor set); footer suppressed.

Verification

• QueryFilterUtils.test.ts: type inference on parse; operator/array/invalid → null (JSON fallback); type-faithful serialization (number stays number, boolean stays boolean, never writes NaN); empty-field drop; empty → ""; round-trip.
• QueryFilterInput.test.tsx (RTL): renders typed rows; a number-typed row serializes to a numeric value; add/remove; JSON-mode fallback for operator queries.
• 107 workflow tests pass; tsc ✓, eslint ✓.

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[simlarsen]

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