[all components] Fix render prop warning false positive

[atomiks]

Fixes #4361

Summary

This narrows the development-only render prop warning so constant-style callbacks such as DEFAULT_RENDER no longer trigger a false positive. The warning still catches component-like names, including PascalCase names with acronym prefixes.

Changes

• Require warned render callback names to look component-like instead of matching uppercase constants.
• Add regression coverage for screaming snake case callbacks.
• Keep warning coverage for standard PascalCase and acronym-prefixed component names.

[atomiks]

Codex Review

Overview

This patch narrows the render prop warning so uppercase constant callbacks like DEFAULT_RENDER stop warning while component-like names still do. The tests cover the false-positive case and preserve the earlier warning behavior for PascalCase and acronym-prefixed component names.

Findings (None)

No blocking issues found in this patch.

Confidence: 4/5

High confidence based on a full pass over the branch diff, targeted inspection of the warning heuristic and regression tests, and successful runs of pnpm test:jsdom useRenderElement --no-watch plus targeted ESLint on the touched files.

Notes

• Reviewed the full upstream/master...HEAD diff.
• No additional accessibility, API, maintainability, or performance concerns surfaced for this small change set.

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@4363
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@4363
  

commit: fa89603

[mui-bot]

Bundle size report

Bundle	Parsed size	Gzip size
@base-ui/react	0B(0.00%)	0B(0.00%)

Details of bundle changes

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