Support $Cashtags in Hashtag Analytics#2605

Twitter/X treats $cashtags like $BTC and $APPL as hashtags and they are widely used in crypto and finance communities. Currently, Publer’s hashtag section does not detect or surface $cashtags, which makes hashtag analysis incomplete for users in these niches.

It would be valuable to add support for $cashtags so they are recognised, tracked, and suggested alongside traditional #hashtags, improving accuracy for finance and crypto-focused accounts.