Make history-related constants configurable

tests/components/backlog.rs

@@ -14,6 +14,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+use std::sync::Arc;
 use std::path::PathBuf;
 
 use color_eyre::eyre::WrapErr;
@@ -29,7 +30,7 @@ fn config() -> Config {
   std::env::set_var("RATATRIX_CONFIG", PathBuf::from(".config/"));
   let c = Config::new();
   std::env::remove_var("RATATRIX_CONFIG");
-  c.unwrap()
+  Arc::new(c.unwrap())
 }
 
 fn rect(x: u16, y: u16, width: u16, height: u16) -> Rect {