Fix file upload reset issue - complete solution

✅ File Input Reset Fix:
- Completely recreate file input element on reset to clear all state
- Remove and recreate DOM elements to eliminate cached event listeners
- Add comprehensive logging for debugging file selection issues
- Force clear file input value and recreate with fresh event handlers

✅ Event Listener Management:
- Clone and replace upload area to remove stale event listeners
- Reinitialize all drag & drop and click event handlers
- Ensure file input click events work after multiple uploads
- Add proper event propagation handling

✅ Upload Area Reinitialization:
- Create initializeUploadArea() function for complete reset
- Remove existing file input and create brand new element
- Reattach all event listeners to fresh DOM elements
- Add console logging for debugging upload flow

✅ Robust State Management:
- Clear uploadedFile variable on reset
- Hide upload controls and results sections
- Remove 'Upload Another' buttons properly
- Ensure clean state between file uploads

This should completely resolve the file upload reset issue where users had to reload the page to upload a second file.

templates/index.html

@@ -50,7 +50,7 @@
                         <i class="fas fa-cloud-upload-alt upload-icon"></i>
                         <p>Drag and drop an image here or click to select</p>
                         <p class="upload-hint">Supported formats: PNG, JPG, JPEG, GIF, BMP</p>
-                        <input type="file" id="fileInput" accept="image/*" style="display: none;">
+                        <input type="file" id="fileInput" accept="image/*" style="display: none;" multiple="false">
                         <button class="btn btn-outline" onclick="document.getElementById('fileInput').click()">
                             Select Image
                         </button>