Fix scanner latency for large uploads

src/lib/scanner/index.ts

@@ -53,12 +53,27 @@ export async function runFullScan(): Promise<{
   let unchanged = 0;
 
     // 3. Find new and changed files
+  const newFiles: ScannedFile[] = [];
   for (const [relPath, file] of scannedFiles) {
     const existing = dbPaths.get(relPath);
-
     if (!existing) {
-      // New file — check stability first
+      newFiles.push(file);
+    } else {
+      unchanged++;
+      dbPaths.delete(relPath);
+    }
+  }
+
+  // Check stability for all new files concurrently (takes max 3 seconds total)
+  const stableResults = await Promise.all(
+    newFiles.map(async (file) => {
       const isStable = await checkFileStability(file.absolutePath);
+      return { file, isStable };
+    })
+  );
+
+  for (const { file, isStable } of stableResults) {
+    const relPath = file.relativePath;
     if (!isStable) {
       console.log(`[Scanner] Skipping unstable file: ${relPath}`);
       continue;
@@ -91,10 +106,6 @@ export async function runFullScan(): Promise<{
       errors.push(msg);
       console.error(`[Scanner] ${msg}`);
     }
-    } else {
-      unchanged++;
-      dbPaths.delete(relPath); // Mark as seen
-    }
   }
 
   // 4. Find removed files (remaining in dbPaths = not found on disk)
@@ -203,3 +214,4 @@ async function checkFileStability(filePath: string): Promise<boolean> {
     return false;
   }
 }
+