replace old client with new client from commafeed-ui repository

commafeed-client/src/app/constants.ts

@@ -0,0 +1,15 @@
+import { DEFAULT_THEME } from "@mantine/core"
+
+export const Constants = {
+    categoryIds: {
+        all: "all",
+    },
+    layout: {
+        mobileBreakpoint: DEFAULT_THEME.breakpoints.md,
+        headerHeight: 60,
+        sidebarWidth: 350,
+    },
+    dom: {
+        mainScrollAreaId: "main-scroll-area-id",
+    },
+}