Summary

Extends the UseVarForPrimitive recipe to also replace explicit String type declarations with var when the initializer is a string literal (e.g. String s = "hello" → var s = "hello"). String literals are unambiguous, so no type hint is needed. Non-literal String initializers (concatenation, method calls) are intentionally excluded.

Test plan

• Tests pass: forString, forStringWithFinal (applicable cases)
• Tests pass: forStringConcatenation, forStringMethodCall (not applicable)
• All existing primitive tests still pass