fix(spec): enforce ViewFilterRuleSchema operator enum + typed sort

[akarma-synetal]

Summary

• operator: z.string() → z.enum([19 valid operators]) so SchemaForm auto-renders a Select dropdown
• sort: z.union([z.string(), z.array(...)]) → z.array(...) so RepeaterField renders sort sub-fields correctly
• Updated fixtures and share-link object to use valid operators
• All 6807 spec tests pass

Test plan

• pnpm --filter @objectstack/spec test — 6807 passed, 0 failed
• Verify Edit View Config in ObjectUI console shows operator dropdown + smart value input (paired with objectui PR)

Made with Cursor

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[os-zhuang]

Thanks for tackling this — the underlying need (a real operator enum so SchemaForm can render a dropdown and invalid operators are rejected) was sound, and it shipped in a reworked form via #3373 (now merged to main), tracked by #3368.

The rework kept your enum direction but adjusted a few things that made the original approach risky:

• Legacy-alias normalization instead of a bare strict enum. operator is now z.preprocess(normalizeFilterOperator, z.enum(VIEW_FILTER_OPERATORS)). Verified that under z.toJSONSchema({ io: 'input' }) (the mode ObjectUI uses) this still surfaces the clean canonical enum for the dropdown, while folding stored shorthand/camelCase spellings (gt, gte, isNull, notEquals, nin, …) to canonical on parse. A strict enum with no aliases would have broken already-stored view metadata and ObjectUI's own FilterBuilderWidget writes (gt/gte).
• isNull → is_null (not is_empty) to preserve null-vs-empty semantics on sys_share_link.
• Kept the legacy string sort form (deprecation note only) and retained the objectui#2601 regression fixture — the sort removal is left to its own deprecation cycle rather than bundled here.
• Relative-date operators (this_quarter, …) were dropped from the operator vocabulary (they're date-range presets, unimplemented at the filter-rule level); fixtures/JSDoc updated instead of the tests being edited to pass.

It also pins widget: 'filter-builder' on the list-view filter field in view.form.ts (matching dataset/page forms) so the Studio editor gets the field-type-aware builder. Paired UI work landed in objectstack-ai/objectui#2766.

Since the change is now on main via #3373, this PR can be closed as superseded. Really appreciate the initial push here.

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