Search UI tweaks and bugfixes (#14328)

* Publish model state and embeddings reindex in dispatcher onConnect

* remove unneeded from explore

* add embeddings reindex progress to statusbar

* don't allow right click or show similar button if semantic search is disabled

* fix status bar

web/src/views/search/SearchView.tsx

@@ -393,7 +393,11 @@ export default function SearchView({
                     >
                       <SearchThumbnail
                         searchResult={value}
-                        findSimilar={() => setSimilaritySearch(value)}
+                        findSimilar={() => {
+                          if (config?.semantic_search.enabled) {
+                            setSimilaritySearch(value);
+                          }
+                        }}
                         onClick={() => onSelectSearch(value, index)}
                       />
                       {(searchTerm ||