remove usage of createStyles from mantine that is removed in v7

commafeed-client/src/tss.ts

@@ -0,0 +1,11 @@
+import { createTss } from "tss-react"
+
+const useContext = () => {
+    // return anything here that will be accessible in tss.create()
+    // we don't need anything right now
+    return {}
+}
+
+export const { tss } = createTss({ useContext })
+
+export const useStyles = tss.create({})