[Altair] Adds Thunderbird email, protonmail bridge. [Nix] Fixes deprecated expressions

home-manager/features/ssh.nix

@@ -3,13 +3,13 @@
   programs.ssh = {
     enable = true;
 
-    # Automatically add keys to agent when used
-    # Other options are "no" and "confirm"
-    addKeysToAgent = "yes";
-
     matchBlocks = {
       "mcp.haven" = {
         user = "drew";
+
+        # Automatically add keys to agent when used
+        # Other options are "no" and "confirm"
+        addKeysToAgent = "yes";
       };
     };
   };