feat: show skip offer countdown and transitions

Sources/Core/progress_reporter.cpp

@@ -293,12 +293,12 @@ ProgressReports::ProgressReports(const std::string &path)
     : single(std::make_unique<ProgressReporter>(path)), active(single.get()) {}
 
 void ProgressReports::registerFile(const std::string &identity, const std::string &path) {
+    std::lock_guard lock(mutex);
     if (single || !ProgressReporter::validMediaIdentity(identity) || entries.size() >= 4096 ||
         path.empty() || path.front() != '/' || path.find('\0') != std::string::npos ||
         entries.contains(identity))
         throw std::runtime_error("Invalid or duplicate queue progress registration");
-    for (const auto &[key, entry] : entries)
-        if (entry.path == path) throw std::runtime_error("Duplicate queue progress report path");
+    if (!paths.insert(path).second) throw std::runtime_error("Duplicate queue progress report path");
     entries.emplace(identity, Entry{path, nullptr});
 }