Fix file dialog double-open: add stopPropagation and reset input value

backend/static/app.js

@@ -73,17 +73,26 @@ class TranscriptionApp {
         const fileInput = document.getElementById('fileInput');
         const browseLink = document.querySelector('.browse-link');
 
-        // Click to browse
-        browseLink.addEventListener('click', () => fileInput.click());
-        dropZone.addEventListener('click', (e) => {
-            if (e.target === dropZone || e.target.closest('.drop-zone-content')) {
-                fileInput.click();
-            }
+        // Click on browse link (stop propagation to avoid double click)
+        browseLink.addEventListener('click', (e) => {
+            e.stopPropagation();
+            fileInput.click();
         });
 
-        // File input change
+        // Click on drop zone (but not on the file input itself)
+        dropZone.addEventListener('click', (e) => {
+            if (e.target === fileInput) return;
+            fileInput.click();
+        });
+
+        // File input change - reset value after handling
         fileInput.addEventListener('change', (e) => {
-            this.handleFiles(e.target.files);
+            const files = e.target.files;
+            if (files.length) {
+                this.handleFiles(files);
+            }
+            // Reset so the same file can be selected again
+            fileInput.value = '';
         });
 
         // Drag & drop