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/data/sources/steamrip.py

@@ -50,6 +50,9 @@ class SteamripScraper:
         for i in range(len(names)):
             ret.append({"title" : names[i], "url" : links[i]})
 
+        self.cache["data"] = ret
+        self.cache["last_fetched"] = current_time
+
         return ret
 
     def scrape_steamrip_game_downloads(self, gamelink):
@@ -72,8 +75,6 @@ class SteamripScraper:
             if len(link) != 1:
                 ret.append(link)
 
-        self.cache["data"] = ret
-
         return ret
 
     def get_download_link(self, post: Dict):