refactor: standardize version key in build_info.json and enhance download selection logic in download.py

feat: add SVG icons for play, pause, and folder actions in gui.py; implement status bar for download speed display
fix: remove unnecessary newline in libtorrent_misc.py and streamline update checker logic in update_checker.py

src/core/utils/network/download.py

@@ -8,12 +8,17 @@ from core.network.libtorrent_int import add_seed
 import threading
 
 
-def download_selected(item, posts, post_titles):
-    if item is not None:
-        consoleLog(f"Downloading {item.text()}")
-        run_thread(threading.Thread(target=run_download, args=(item.text(), posts, post_titles)))
-    else:
+def download_selected(items, posts, post_titles):
+    if not items:
         consoleLog("No item selected for download.")
+        return
+    seen = set()
+    for item in items:
+        text = item.text()
+        if text and text not in seen:
+            seen.add(text)
+            consoleLog(f"Downloading {text}")
+            run_thread(threading.Thread(target=run_download, args=(text, posts, post_titles)))
 
 def run_download(item, posts, post_titles):
     post_url = get_item_url(item, posts, post_titles)