Anchor perspective codebase tree tooltip

Author: hojberg

src/css/ui/components/codebase-tree.css

@@ -16,6 +16,11 @@
   line-height: 1;
 }
 
+.codebase-tree .namespace-tree .subtree {
+  /* to anchor the tooltip */
+  position: relative;
+}
+
 .codebase-tree .error {
   padding-left: 0.5rem;
   display: flex;