fix: match variable aliases using transformed constant names

[luxscious]

Fixes #538

The diff command couldn't match variable keys to auto-generated constant aliases.

Problem: Alias map has MY_VARIABLE: 'my-variable', but lookup tried aliasMap['my-variable'] → undefined

Solution: Try both direct and transformed lookup: aliasMap[name] || aliasMap[keyToConstant(name)]

[Copilot]

Pull Request Overview

This PR extracts common variable key-to-constant name transformation logic into a reusable utility function. The refactoring consolidates duplicate logic that converts variable keys (like 'my-variable') into constant names (like 'MY_VARIABLE') and enables better handling of variable aliases in the diff command.

• Extracted keyToConstant utility function to centralize the transformation logic
• Updated generate/types.ts to use the new utility instead of inline logic
• Enhanced diff/index.ts to handle aliased variable matching using both direct name and constant-transformed name

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/utils/keyToConstant.ts	New utility function for transforming variable keys to constant format
src/commands/generate/types.ts	Refactored to use the new keyToConstant utility
src/commands/diff/index.ts	Enhanced alias matching to support constant-transformed variable names

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[Copilot]

Pull Request Overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

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[suthar26]

might want to call the useVariableValue here for a more accurate test instead of a string match?

[luxscious]

If we use useVariableValue then the bug doesn't get caught 🙃

[suthar26]

the bug is related to the use of the variableKey and the VariableAlias, should get caught either way