feat(ui): add overall upload progress and improve file icons

- Track per-file loaded bytes and compute an overall upload percentage
- Add overall progress bar/percent styling and resize upload window to fit
- Hide the upload result section until a share URL is available
- Use a specific icon for .exe files and update the default fallback iconfeat(ui): add overall upload progress and improve file icons

- Track per-file loaded bytes and compute an overall upload percentage
- Add overall progress bar/percent styling and resize upload window to fit
- Hide the upload result section until a share URL is available
- Use a specific icon for .exe files and update the default fallback icon

templates/index.html

@@ -48,7 +48,7 @@
                             <p class="upload-empty-state">No files selected</p>
                         </div>
 
-                        <div class="upload-result" aria-live="polite">
+                        <div class="upload-result is-hidden" aria-live="polite">
                             <span class="upload-result-label">Folder link</span>
                             <a id="upload-box-link" class="upload-result-link is-empty" href="#" aria-disabled="true">Waiting for upload</a>
                             <button id="upload-share-button" class="win98-button upload-share-button" type="button" disabled>Share</button>
@@ -60,6 +60,13 @@
                         <button class="win98-button" type="submit">Upload</button>
                     </footer>
 
+                    <div class="upload-overall" aria-live="polite">
+                        <div class="upload-overall-track" aria-hidden="true">
+                            <span class="upload-overall-bar"></span>
+                        </div>
+                        <span class="upload-overall-percent">0%</span>
+                    </div>
+
                     <div class="win98-statusbar upload-statusbar" aria-live="polite">
                         <span>Ready</span>
                         <span>WarpBox</span>