fix: restore rooms and DMs after React Router 7 upgrade

Stop double-encoding Matrix IDs in pathUtils, decode route params on read, fix millify CJS import, and read space children from currentState so channels and joins work again.

src/app/components/BackRouteHandler.tsx

@@ -1,6 +1,7 @@
 import { ReactNode, useCallback } from 'react';
 import { matchPath, useLocation, useNavigate } from 'react-router-dom';
 import {
+  decodeRouteParam,
   getDirectPath,
   getExplorePath,
   getHomePath,
@@ -52,7 +53,10 @@ export function BackRouteHandler({ children }: BackRouteHandlerProps) {
       location.pathname
     );
     if (spaceMatch?.params.spaceIdOrAlias) {
-      navigate(getSpacePath(spaceMatch.params.spaceIdOrAlias));
+      const spaceIdOrAlias = decodeRouteParam(spaceMatch.params.spaceIdOrAlias);
+      if (spaceIdOrAlias) {
+        navigate(getSpacePath(spaceIdOrAlias));
+      }
       return;
     }
     if (