refactor: enhance mobile swipe gesture handling and improve outlet behavior on compact routes

overlay/src/app/hooks/useCompactNav.ts

@@ -0,0 +1,30 @@
+import { matchPath, useLocation } from 'react-router-dom';
+import { DIRECT_PATH, EXPLORE_PATH, HOME_PATH, INBOX_PATH, SPACE_PATH } from '../pages/paths';
+import { ScreenSize, useScreenSizeContext } from './useScreenSize';
+
+/** Skinny window layout (≤750px): master-detail instead of 3-column desktop. */
+export const useCompactNav = (): boolean => {
+  const screenSize = useScreenSizeContext();
+  return screenSize === ScreenSize.Mobile;
+};
+
+const LIST_ROUTE_PATHS = [HOME_PATH, DIRECT_PATH, SPACE_PATH, EXPLORE_PATH, INBOX_PATH] as const;
+
+/**
+ * Routes where sidebar + channel list are shown together (no room/content pane).
+ * Uses matchPath on the current pathname so trailing-slash / encoding quirks
+ * after DM → space navigations still count as master list routes.
+ */
+export const useIsCompactListRoute = (): boolean => {
+  const { pathname } = useLocation();
+
+  return LIST_ROUTE_PATHS.some(
+    (path) => matchPath({ path, caseSensitive: true, end: true }, pathname) != null
+  );
+};
+
+export const useShowCompactMasterView = (): boolean => {
+  const compact = useCompactNav();
+  const isListRoute = useIsCompactListRoute();
+  return compact && isListRoute;
+};