docs(skill): document a data grid's column filters where a data grid is documented

[tgolembiewski]

Closes #1166

What

Documentation only. A DataGrid2 filters itself and mxcli supports every part of it; the pages that say so are not the pages a reader building a grid opens.

• create-page/reference/widgets.md opened its filter section with "Filter widgets are used inside GALLERY FILTER containers". Everything under that line — textfilter, numberfilter, datefilter, dropdownfilter and the association form — applies to a data grid column too, but the section announced itself as being about galleries. The lead-in now names both homes, the grid column first, with a two-line example of each.
• overview-pages/SKILL.md had a table mapping each attribute type to its filter widget and nothing else. It gains the two forms a real list needs first: a dropdownfilter over an association (Association: + datasource: + CaptionAttribute:), and FilterType: between for a date range. Plus one short paragraph saying the grid filters itself, because the alternative keeps being written.

Why the last paragraph

Two apps generated with mxcli, by different models, independently built the same filter bar on their order list: a non-persistent filter entity, inputs bound to its attributes, an apply microflow on every OnChange, a Clear button, and an XPath on the grid reading the filter object back. One of them cost three microflows (66 lines of MDL), nine input widgets and 1,100 characters of XPath where five column filters do the same job — and the hand-built version loses the paging, sorting and per-user personalisation the grid does on its own.

Verified

Blank 11.12.1 project, binary built from main at 643271e:

column colCreated (attribute: "Created", caption: 'Created') { datefilter fltCreated (FilterType: between) }

mxcli check --references passes, exec applies it, mx check reports 0 errors, and DESCRIBE PAGE returns the same line. The association form round-trips the same way.

overview-pages/SKILL.md goes 675 → 696 lines, under the 700 TestLargeSkillsWereSplit allows.

Validation

Full local run of push-test.yml, green: make build, make test, check-tunnel-deps, make check-mdl, make check-skill-pack-js, make check-findings, make check-wiki-pages, check-skill-mdl.sh over .claude/skills/mendix and docs-site/src, make lint-go, make test-integration against mx 11.12.1.

[github-actions]

AI Code Review

Critical Issues

• None

Moderate Issues

• None

Minor Issues

• None

What Looks Good

• The PR is documentation-only, improving clarity for DataGrid2 column filters in two skill files:
  • .claude/skills/mendix/create-page/reference/widgets.md now correctly states filter widgets live in both data grid columns and gallery filter containers, with clear examples for each.
  • .claude/skills/mendix/overview-pages/SKILL.md adds missing association filter form (Association: + datasource: + CaptionAttribute:), FilterType: between for date ranges, and reinforces that grids filter themselves (discouraging manual filter bars).
• CHANGELOG.md entry accurately summarizes the documentation improvements.
• Author verified all documented syntax works end-to-end: mxcli check --references passes, exec applies changes, mx check reports 0 errors, and DESCRIBE PAGE roundtrips correctly.
• No code changes, so no risk of introducing bugs or violating architectural guidelines.
• Changes are scoped to documentation improvements only, maintaining atomicity.

Recommendation

• Approve. The documentation improvements are accurate, verified, and address a real user confusion point without modifying any code or MDL syntax. No further changes needed.

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