fix: Add locks, logging refactor, and bugfixes

Improve thread-safety, logging, and various bug fixes across the app.

Key changes:
- Add and use state.downloads_lock around accesses to state.active_downloads in multiple modules (UI, libtorrent, misc, direct downloads) to prevent race conditions.
- Prevent concurrent dl_status_loop runs using a non-blocking _loop_lock and ensure proper iteration over a snapshot of downloads.
- Add metadata timeout when waiting for torrent metadata and fix free-space check logic to remove or reject downloads appropriately.
- Refactor download log persistence: add _load_downloads and _save_downloads helpers and centralize JSON read/write logic in utils/logging/logs.py.
- Optimize DirectDownloadStatus speed window by switching to deque and using popleft to trim older samples.
- Trim console log widget to 500 lines to avoid unbounded growth.
- Add small state fields for custom image positioning (x/y and enabled flag).
- Fix Steamrip scraper caching behavior and make Uztracker return an empty list on fetch failures.
- Add defensive checks in run_download to handle missing links.

These changes focus on stability and correctness for concurrent download handling and durable logging.

src/interface/dialogs/contextmenu.py

@@ -34,10 +34,12 @@ class ContextMenu:
         if not hasattr(self, '_context_menu_row'):
             return
         row = self._context_menu_row
-        if row < 0 or row >= len(state.active_downloads):
-            return
-        magnet_link = list(state.active_downloads.keys())[row]
-        magnetdl = state.active_downloads[magnet_link]
+        with state.downloads_lock:
+            if row < 0 or row >= len(state.active_downloads):
+                return
+            keys = list(state.active_downloads.keys())
+            magnet_link = keys[row]
+            magnetdl = state.active_downloads[magnet_link]
         download_path = magnetdl.save_path()
         if download_path and os.path.exists(download_path):
             if platform.system() == "Windows":
@@ -51,9 +53,11 @@ class ContextMenu:
         if not hasattr(self, '_context_menu_row'):
             return
         row = self._context_menu_row
-        if row < 0 or row >= len(state.active_downloads):
-            return
-        magnet_link = list(state.active_downloads.keys())[row]
+        with state.downloads_lock:
+            if row < 0 or row >= len(state.active_downloads):
+                return
+            keys = list(state.active_downloads.keys())
+            magnet_link = keys[row]
         clipboard = QtWidgets.QApplication.clipboard()
         clipboard.setText(magnet_link)
 
@@ -64,7 +68,8 @@ class ContextMenu:
         with state.downloads_lock:
             if row < 0 or row >= len(state.active_downloads):
                 return
-            magnet_link = list(state.active_downloads.keys())[row]
+            keys = list(state.active_downloads.keys())
+            magnet_link = keys[row]
             magnetdl = state.active_downloads[magnet_link]
 
         # Cache the name BEFORE removing from session