Improved how AI Studio saves its files (#1201)

app/MindWork AI Studio/Settings/SettingsManager.cs

@@ -452,33 +452,13 @@ public sealed class SettingsManager
         }
 
         //
-        // We write the new settings next to the previous ones and replace them afterwards, so that
-        // no crash can leave a half-written settings file behind. The temporary file has to live in
-        // the configuration directory for that: replacing a file is a rename, and a rename across a
-        // file system boundary falls back to copying, which is exactly what we want to avoid. The
-        // temporary directory of the operating system is such another file system under Flatpak.
+        // AtomicFile writes the new settings next to the previous ones and replaces them afterwards,
+        // so that no crash can leave a half-written settings file behind. The settings also have to
+        // reach the disk first: the backup file is written at the same moment, so after a power
+        // failure, it would be no better off than the settings file, and falling back to it blocks
+        // storing the settings anyway.
         //
-        var tempFile = $"{settingsPath}.tmp-{Guid.NewGuid():N}";
-        try
-        {
-            await File.WriteAllTextAsync(tempFile, settingsJson);
-            File.Move(tempFile, settingsPath, true);
-        }
-        catch
-        {
-            try
-            {
-                if (File.Exists(tempFile))
-                    File.Delete(tempFile);
-            }
-            catch (Exception cleanupException)
-            {
-                this.logger.LogWarning(cleanupException, $"Failed to delete the temporary settings file '{tempFile}'.");
-            }
-
-            throw;
-        }
-
+        await AtomicFile.WriteTextAsync(settingsPath, settingsJson, new UTF8Encoding(false), CancellationToken.None, flushToDisk: true, logger: this.logger);
         this.logger.LogInformation($"Stored the settings to '{settingsPath}'.");
     }