Chore: deleted unused files, dead code; minor fixes (#2059)

* (feat:pause-stream) generator exit

* (feat:pause-stream) close request

* (feat:pause-stream) finally close; google anthropic

* (feat:task_status)communicate failure

* (clean:connector) unused routes

* (feat:file-table) missing skeletons

* (chore:fe) purge unused

* (fix:apiKeys) build err

* (chore:settings) clean unused

* merge from main

* (chore:purge) unused fe assets

* (clean:check_docs) unused logic

* (feat:selectedDocs) replace null type

---------

Co-authored-by: GH Action - Upstream Sync <action@github.com>

frontend/src/upload/Upload.tsx

@@ -14,6 +14,7 @@ import { ActiveState, Doc } from '../models/misc';
 
 import { getDocs } from '../preferences/preferenceApi';
 import {
+  selectSelectedDocs,
   selectSourceDocs,
   selectToken,
   setSelectedDocs,
@@ -50,6 +51,7 @@ function Upload({
   onSuccessfulUpload?: () => void;
 }) {
   const token = useSelector(selectToken);
+  const selectedDocs = useSelector(selectSelectedDocs);
 
   const [files, setfiles] = useState<File[]>(receivedFile);
   const [activeTab, setActiveTab] = useState<boolean>(true);
@@ -336,7 +338,13 @@ function Upload({
                   (doc: Doc) => doc.id && !existingDocIds.has(doc.id),
                 );
                 if (newDoc) {
-                  dispatch(setSelectedDocs([newDoc]));
+                  // If only one doc is selected, replace it completely
+                  // If multiple docs are selected, append the new doc
+                  if (selectedDocs.length === 1) {
+                    dispatch(setSelectedDocs([newDoc]));
+                  } else {
+                    dispatch(setSelectedDocs([...selectedDocs, newDoc]));
+                  }
                 }
               }