Fix: Allow enum keys with non-identifier names in computed properties

[atsushi196323]

Summary

This PR fixes issue #25083 by enabling enum keys with non-identifier names (like '3x14' and 'hello-world') to work in computed property names using bracket notation.

• Support element access expressions (e.g., Type['key']) in computed property names
• Add isEntityNameElementAccess() helper function to validate element access patterns
• Allows computed properties to work with any valid enum key format

Changes

• Modified isLateBindableAST() in src/compiler/checker.ts to recognize element access expressions
• Added new helper function isEntityNameElementAccess() to validate bracket notation access patterns

Test Plan

• Added comprehensive test case enumComputedPropertyNonIdentifier.ts covering:
  • Enums with non-identifier keys like '3x14' and 'hello-world'
  • Computed properties using bracket notation for these keys
  • Type inference and symbol resolution
  • JavaScript output generation

All baselines verified:

• .types - Type information correct
• .symbols - Symbol resolution working
• .js - Compiled output valid

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