Learn Farsi: آیا این لهجه‌ی غنی همچنان در شهر رایج است؟ - Is this rich accent still prevalent in the city?

While both can be translated as 'still', hamchenân specifically emphasizes that a state has continued persistently and is exactly as it was before. It carries a slightly more formal or emphatic tone than the everyday word hanuz.

Where does the adverb hamchenân naturally sit in a sentence like this?

Like many adverbs of state in Farsi, hamchenân is quite flexible. Here it sits right after the subject in lahje-ye ghani, but you could also place it after dar shahr to say in lahje-ye ghani dar shahr hamchenân râyej ast? The meaning stays exactly the same.

Can the word ghani (rich) be used to describe a wealthy person too?

Yes, but it is a bit formal. For a wealthy person, everyday Farsi prefers puldâr or sarmâyedâr. ghani is most naturally used for things that are rich in depth, culture, resources, or history, like an accent, a language, or a country's natural resources.

Why does the ezafe sound like -ye between lahje and ghani?

The word lahje (accent) ends in a silent he. When adding the ezafe to connect a noun to its adjective, Farsi words ending in a spoken vowel sound like the short 'e' at the end of lahje require the consonant 'y' to bridge the gap, making it lahje-ye.