fix: append new drops to upload queue instead of overwriting it

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

frontend/static/js/upload.js

@@ -273,7 +273,6 @@ function processFiles(files, progressContainer, statusMessage) {
   if (statusMessage) {
     statusMessage.textContent = `Queued ${fileArray.length} file(s) for upload…`;
   }
-  if (progressContainer) progressContainer.innerHTML = '';
 
   // Pre-create one progress row per file.
   const queueItems = fileArray.map((file) => {

frontend/templates/files.html

@@ -1327,7 +1327,6 @@
       if (files.length > 0) {
         // Show upload modal
         uploadModal.classList.add('active');
-        uploadProgressContainer.innerHTML = '';
 
         // Process the dropped files (queue-based, with adaptive throttling)
         processFiles(files, uploadProgressContainer, uploadStatusMessage);

frontend/templates/upload.html

@@ -160,9 +160,6 @@
 
     const files = await getFilesFromDataTransfer(e.dataTransfer);
     if (files.length) {
-      // Clear previous upload progress
-      uploadProgress.innerHTML = "";
-
       // Create progress container
       const progressContainer = document.createElement("div");
       progressContainer.className = "space-y-2";
@@ -175,9 +172,6 @@
 
   function handleFileSelect(e) {
     if (e.target.files.length) {
-      // Clear previous upload progress
-      uploadProgress.innerHTML = "";
-
       // Create progress container
       const progressContainer = document.createElement("div");
       progressContainer.className = "space-y-2";