Studio: field-type-aware operator + value editing for view filter rules (Edit View Config)

[os-zhuang]

Background

In the metadata admin (Studio) Edit View Config form, view filter rules ({ field, operator, value } rows rendered by SchemaForm) are edited as raw inputs today:

• operator is a free-text string — no dropdown, no validation, no human-readable labels;
• value is a plain text input regardless of the selected field's type (boolean, number, date, select, …);
• unary operators (is_empty, is_null, …) still show a value input even though no value applies.

This is a real UX gap. PR #2760 (paired with objectstack-ai/objectstack#3363) attempted it but was rejected — see "Prior art" below. This issue tracks the redevelopment.

Depends on: objectstack-ai/objectstack#3368 (canonical operator vocabulary in ViewFilterRuleSchema — the operator dropdown needs the spec enum, and the vocabulary the UI writes must be settled there first).

Requirements

1. Operator select — dropdown with human-readable labels, narrowed to the operators valid for the selected field's type (text / number / boolean / date / select-like / lookup). Must stay consistent with the runtime FilterBuilder's per-type operator sets.
2. Type-aware value input — boolean → switch, number/currency/percent → number input, date/datetime → date(-time) picker, select/lookup → option picker where the field catalog provides options, default → text.
3. Operator-aware value input — between → from/to range (this must also apply to date fields — operator check has to take precedence over the field-type branch); in/not_in → multi-value input; unary operators → no value input (placeholder).
4. Correct value typing in stored metadata — booleans stored as real booleans (not "true"/"false" strings), numbers as numbers, in/not_in as arrays (not comma-joined strings), between as a [from, to] pair. The stored format stays spec ViewFilterRule[].
5. Single source of truth for operator logic — reuse or extract the existing FilterBuilder per-type operator lists / the filter-builder widget (packages/app-shell/src/views/metadata-admin/widgets.tsx) rather than a parallel implementation. Studio must not have two editors writing different operator vocabularies for the same stored field. Evaluate whether the filter rows should simply use the existing filter-builder widget for unified UX.
6. i18n — all labels (operator names, "from"/"to", placeholders) go through the existing t(...) locale mechanism; no hardcoded English.
7. Scoped widget detection — target filter-rule rows precisely (e.g. via schema context or explicit widget assignment), not broad name conventions like /Operator$/ / /Value$/ that can hijack unrelated fields (defaultValue, etc.).
8. Source object detection — keep the ResourceEditPage improvement of reading draft.data.object as a source-object fallback so filter rows get the object field catalog.

Acceptance criteria

• Edit View Config filter row: operator renders as a labeled dropdown filtered by the selected field's type.
• Value input adapts to field type and operator per the matrix above, including date + between showing a range.
• Stored values round-trip with correct JS types and validate against ViewFilterRuleSchema.
• Operator vocabulary written by this editor matches what the existing filter-builder widget writes (post framework#3368 canonicalization).
• All user-facing strings localized.
• No widget detection regressions on unrelated *Value / *Operator fields in other metadata forms.

Prior art

PR #2760 — rejected for: parallel operator/value implementation duplicating FilterBuilder; operator vocabulary conflicting with what FilterBuilderWidget writes (gt/gte/lt/lte); between unreachable for date fields (branch-order bug); booleans stored as strings and in values as comma-joined strings; literal — rendered in JSX; hardcoded English labels; over-broad name-convention widget detection; undeclared hard dependency on the framework spec PR.