better d-bus interface for attachments

kordophoned/src/daemon/mod.rs

@@ -60,6 +60,7 @@ pub mod target {
     pub static EVENT: &str = "event";
     pub static SETTINGS: &str = "settings";
     pub static UPDATES: &str = "updates";
+    pub static ATTACHMENTS: &str = "attachments";
 }
 
 pub struct Daemon {
@@ -284,6 +285,12 @@ impl Daemon {
                 let attachment = self.attachment_store.get_attachment(&guid);
                 reply.send(attachment).unwrap();
             }
+
+            Event::DownloadAttachment(attachment_id, reply) => {
+                // For now, just return success - we'll implement the actual download logic later
+                log::info!(target: target::ATTACHMENTS, "Download requested for attachment: {}", attachment_id);
+                reply.send(()).unwrap();
+            }
         }
     }