Fix concurrent upload batch accounting

Reserve accepted job IDs before asynchronous upload preparation so parallel additions cannot start duplicate jobs or replace their abort controllers. Track late-added jobs in the batch total and keep failure counts non-negative, with focused race and summary regressions.

lib/upload-manager.js

@@ -53,6 +53,8 @@ class UploadManager extends EventEmitter {
     this._doodApiKeyCache = new Map(); // accountId/username -> derived doodstream API key ('' = tried, none)
     this._baselineCache = new Map(); // hoster:apiKey -> Promise<Set<file_code>> (one fetch shared across all jobs in batch)
     this._recoveryClaims = createRecoveryClaimRegistry();
+    this._batchJobIds = new Set();
+    this._batchTotal = 0;
   }
 
   updateAccountPools(accountPools) {
@@ -336,6 +338,8 @@ class UploadManager extends EventEmitter {
   async startBatch(tasks, opts = {}) {
     const pendingCancelledJobIds = new Set(this.pendingCancelledJobIds);
     const pendingCancelAll = this.pendingCancelAll;
+    this._batchJobIds = new Set(tasks.map((task) => task.jobId).filter(Boolean));
+    this._batchTotal = tasks.length;
     this.pendingCancelledJobIds.clear();
     this.pendingCancelAll = false;
     this.running = true;
@@ -422,7 +426,7 @@ class UploadManager extends EventEmitter {
     this._emitStats();
 
     const files = Array.from(results.values());
-    const total = tasks.length;
+    const total = this._batchTotal;
     const succeeded = files.reduce((count, file) => count + file.results.filter((result) => result.status === 'done').length, 0);
     const skipped = files.reduce((count, file) => count + file.results.filter((result) => result.status === 'skipped').length, 0);
 
@@ -431,7 +435,7 @@ class UploadManager extends EventEmitter {
       timestamp: new Date().toISOString(),
       total,
       succeeded,
-      failed: total - succeeded - skipped,
+      failed: Math.max(0, total - succeeded - skipped),
       skipped,
       files
     };
@@ -1461,16 +1465,18 @@ class UploadManager extends EventEmitter {
     const addResult = { added: 0, alreadyInBatchJobIds: [] };
     for (const task of tasks) {
       // Skip if this job is already being processed (prevent duplicates)
-      if (task.jobId && this.jobAbortControllers.has(task.jobId)) {
+      if (task.jobId && this._batchJobIds.has(task.jobId)) {
         addResult.alreadyInBatchJobIds.push(task.jobId);
         continue;
       }
+      if (task.jobId) this._batchJobIds.add(task.jobId);
       const fileName = path.basename(task.file);
       if (!results.has(task.file)) {
         let size = 0;
         try { size = fs.statSync(task.file).size; } catch {}
         results.set(task.file, { name: fileName, size, results: [] });
       }
+      this._batchTotal++;
       this._additionalPromises.push(this._runJob(task, results, signal));
       addResult.added++;
     }