Bug in AttributeMustacheProvider.getPossibleDirectBinding: using attrName instead of bindingName

[coderabbitai]

Description

In packages/provider.mustache/src/AttributeMustacheProvider.ts, the getPossibleDirectBinding method has a bug where it retrieves bindingName from ATTRIBUTES_BINDING_MAP but then incorrectly passes attrName to bindingHandlers.get().

This means for attributes like class, the code looks up a class handler instead of the intended css handler (since DEFAULT_ATTRIBUTE_BINDING_MAP maps 'class' → 'css').

The method currently has a FIXME comment acknowledging this issue.

Current Behavior

getPossibleDirectBinding(attrName: string) {
  const bindingName = this.ATTRIBUTES_BINDING_MAP[attrName]
  return bindingName && this.bindingHandlers.get(attrName) //FIXME this.bindingHandlers.get(bindingName) ?
}

The mapped bindingName value is computed but never used in the lookup.

Expected Behavior

The method should use bindingName for the handler lookup so that attribute mappings work correctly.

Requirements

• Fix the handler lookup to use the correct binding name
• Add test case to verify the fix works correctly
• Ensure attribute mappings like 'class' → 'css' resolve the correct handler

Context

Reported by: @phillipc
Related PR: #234
Review comment: #234 (comment)