fix: additionalProperties validation in baseWidgetLayoutsTemplateConfig

[tahmidefaz]

restructure baseWidgetLayoutsTemplateConfig schema to fix additionalProperties validation

The breakpoint items (sm, md, lg, xl) had and additionalProperties: false
as sibling keywords. In JSON Schema 2020-12, additionalProperties only considers
properties defined in the same schema object, not those from . This caused
ajv to reject all properties (w, h, cx, cy, i) as additional.

Move inside allOf so templateConfigItem's own additionalProperties: false
handles property restriction, while per-breakpoint constraints remain in a
second allOf entry.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 97831215-478e-4887-8b71-3d1a9e6368e4

📥 Commits

Reviewing files that changed from the base of the PR and between 6ed0d00 and 3c00b95.

📒 Files selected for processing (1)

• packages/config-utils/src/feo/spec/frontend-crd.schema.json

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Summary by CodeRabbit

• Refactor
  • Updated internal validation structure for widget layout configurations to improve system maintainability and consistency.

Walkthrough

The PR refactors the JSON schema for per-breakpoint widget template configurations, converting from inline object definitions to allOf compositions. The same validation requirements are maintained; only the schema representation structure changes.

Changes

Cohort / File(s)	Summary
Schema Refactoring packages/config-utils/src/feo/spec/frontend-crd.schema.json	Restructured per-breakpoint widget templates (sm, md, lg, xl) in baseWidgetLayoutsTemplateConfig from inline objects with refs to allOf compositions combining templateConfigItem references with separate required field declarations, preserving validation constraints.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: fixing additionalProperties validation in a specific schema component, which matches the core objective of restructuring the schema.
Description check	✅ Passed	The description is directly related to the changeset, explaining the schema restructuring and the specific JSON Schema 2020-12 behavior that necessitated the change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-schema-bug

📝 Coding Plan

• Generate coding plan for human review comments

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[justinorringer]

LGTM!