🐛 fix: files added during upload now actually get uploaded

When user added new files during an active upload (drag-drop, picker
or folder monitor with pre-selected hosters), the files were pushed to
selectedFiles but NO queue jobs were created (because updateUploadView
skips buildQueuePreview during uploading=true).

The files briefly showed up via folder monitor's direct buildQueuePreview
call, but then handleBatchDone → syncSelectedFilesFromQueue removed them
from selectedFiles because they had no queue jobs.

Now: applyHosterSelection() and folder monitor both detect added files
during upload and:
1. Build preview jobs for the new files
2. Reset them to 'queued' status
3. Inject them into the running batch via addJobsToBatch IPC

The upload-manager has duplicate protection so re-injection is safe.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

renderer/app.js

@@ -119,10 +119,24 @@ async function init() {
         }
       }
       if (newFiles.length > 0) {
+        const newPaths = new Set(newFiles.map(f => f.path));
         selectedFiles.push(...newFiles);
         buildQueuePreview();
         updateUploadView();
-        if (fm.autoStart && !uploading && !healthCheckRunning) startUpload();
+        if (fm.autoStart && !uploading && !healthCheckRunning) {
+          startUpload();
+        } else if (uploading) {
+          // Inject new preview jobs into the running batch
+          const newJobs = queueJobs.filter(j => j.status === 'preview' && newPaths.has(j.file));
+          if (newJobs.length > 0) {
+            newJobs.forEach(j => { j.status = 'queued'; });
+            renderQueueTable();
+            window.api.addJobsToBatch({
+              jobs: newJobs.map(j => ({ id: j.id, file: j.file, fileName: j.fileName, hoster: j.hoster }))
+            }).then(result => { _markSkippedJobs(result); }).catch(() => {});
+            persistQueueStateSoon(true);
+          }
+        }
       }
     } else {
       // No pre-selected hosters: open modal
@@ -360,11 +374,29 @@ function applyHosterSelection() {
   selectedUploadHosters = Array.from(document.querySelectorAll('input[data-hoster-modal]:checked'))
     .map(input => input.dataset.hosterModal);
   // Move pending files to selectedFiles on confirm
+  const pendingPaths = new Set(_pendingFiles.map(f => f.path));
   if (_pendingFiles.length > 0) {
     selectedFiles.push(..._pendingFiles);
     _pendingFiles = [];
   }
   renderHosterSummary();
+
+  // During an active upload, build preview jobs for the new files and inject
+  // them into the running batch immediately (otherwise they'd be lost on
+  // handleBatchDone via syncSelectedFilesFromQueue)
+  if (uploading && pendingPaths.size > 0) {
+    buildQueuePreview(); // creates 'preview' jobs for new files
+    const newJobs = queueJobs.filter(j => j.status === 'preview' && pendingPaths.has(j.file));
+    if (newJobs.length > 0) {
+      newJobs.forEach(j => { j.status = 'queued'; });
+      renderQueueTable();
+      window.api.addJobsToBatch({
+        jobs: newJobs.map(j => ({ id: j.id, file: j.file, fileName: j.fileName, hoster: j.hoster }))
+      }).then(result => { _markSkippedJobs(result); }).catch(() => {});
+      persistQueueStateSoon(true);
+    }
+  }
+
   updateUploadView();
   persistQueueStateSoon(true); // immediate persist after adding files
   document.getElementById('hosterModal').style.display = 'none';