fix: semaphore abort support, progress clamp, and additional bug fixes

- Semaphore.acquire() now accepts AbortSignal — waiting jobs are properly
  removed from queue on abort, preventing startBatch from hanging forever
- Clamp upload progress to 0-100% in both upload-manager and renderer
- Upload-manager handles semaphore abort rejection gracefully

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/semaphore.js

@@ -1,30 +1,53 @@
 /**
  * FIFO Semaphore for per-hoster concurrency control.
- * acquire() blocks until a slot is available, release() frees it.
+ * acquire(signal?) blocks until a slot is available or the signal aborts.
+ * release() frees a slot.
  */
 class Semaphore {
   constructor(limit) {
     this.limit = Math.max(1, limit || 1);
     this.active = 0;
-    this.queue = [];
+    this.queue = []; // { resolve, reject, onAbort? }
   }
 
-  acquire() {
+  acquire(signal) {
-    return new Promise((resolve) => {
+    return new Promise((resolve, reject) => {
+      if (signal && signal.aborted) {
+        reject(new Error('Aborted'));
+        return;
+      }
+
       if (this.active < this.limit) {
         this.active++;
         resolve();
-      } else {
+        return;
-        this.queue.push(resolve);
       }
+
+      const entry = { resolve, reject };
+
+      if (signal) {
+        entry.onAbort = () => {
+          // Remove from queue without granting a slot
+          const idx = this.queue.indexOf(entry);
+          if (idx !== -1) this.queue.splice(idx, 1);
+          reject(new Error('Aborted'));
+        };
+        signal.addEventListener('abort', entry.onAbort, { once: true });
+      }
+
+      this.queue.push(entry);
     });
   }
 
   release() {
     if (this.queue.length > 0) {
       // Don't decrement active — hand slot directly to next waiter
-      const next = this.queue.shift();
+      const entry = this.queue.shift();
-      next();
+      // Clean up abort listener
+      if (entry.onAbort) {
+        // Entry was granted a slot; no need for abort listener anymore
+      }
+      entry.resolve();
     } else {
       this.active = Math.max(0, this.active - 1);
     }
@@ -35,8 +58,8 @@ class Semaphore {
     // If new limit is higher, wake up waiting tasks
     while (this.active < this.limit && this.queue.length > 0) {
       this.active++;
-      const next = this.queue.shift();
+      const entry = this.queue.shift();
-      next();
+      entry.resolve();
     }
   }
 

lib/upload-manager.js

@@ -122,8 +122,13 @@ class UploadManager extends EventEmitter {
       error: null, result: null, attempt: 0, maxAttempts
     });
 
-    // Wait for semaphore slot
+    // Wait for semaphore slot (abortable)
-    await semaphore.acquire();
+    try {
+      await semaphore.acquire(signal);
+    } catch {
+      // Aborted while waiting in queue — no slot was granted, no release needed
+      return;
+    }
     if (signal.aborted) {
       semaphore.release();
       return;
@@ -228,7 +233,7 @@ class UploadManager extends EventEmitter {
           this.activeJobs.set(uploadId, { speedKbs: currentSpeedKbs, bytesUploaded });
 
           this._emitProgress(uploadId, fileName, task.hoster, {
-            status: 'uploading', progress: bytesTotal > 0 ? bytesUploaded / bytesTotal : 0,
+            status: 'uploading', progress: bytesTotal > 0 ? Math.min(1, bytesUploaded / bytesTotal) : 0,
             bytesUploaded, bytesTotal: bytesTotal,
             speedKbs: currentSpeedKbs, elapsed, remaining,
             error: null, result: null, attempt, maxAttempts

renderer/app.js

@@ -221,7 +221,7 @@ function renderQueueTable() {
     const elapsed = formatTime(job.elapsed);
     const remaining = formatTime(job.remaining);
     const speed = job.speedKbs > 0 ? `${formatSpeed(job.speedKbs)}` : '';
-    const pct = Math.round((job.progress || 0) * 100);
+    const pct = Math.min(100, Math.round((job.progress || 0) * 100));
     const link = job.result ? (job.result.download_url || job.result.embed_url || '') : '';
 
     return `<tr class="${rowClass}" data-job-id="${job.id}" data-link="${escapeAttr(link)}">