Add source URL tracking and display for AppImages

src/core/database.rs

@@ -1744,6 +1744,16 @@ impl Database {
         Ok(self.conn.last_insert_rowid())
     }
 
+    // --- Source URL ---
+
+    pub fn set_source_url(&self, id: i64, url: Option<&str>) -> SqlResult<()> {
+        self.conn.execute(
+            "UPDATE appimages SET source_url = ?2 WHERE id = ?1",
+            params![id, url],
+        )?;
+        Ok(())
+    }
+
     // --- Version rollback ---
 
     pub fn set_previous_version(&self, id: i64, path: Option<&str>) -> SqlResult<()> {