feat(jujutsu): add timestamp.ago() to format

Timestamps currently display only the time, which is... fine, but can
be somewhat annoying to see how long ago something actually was. It's
possible to use timestamp.ago() to show how long ago a thing was as
well. Let's add it to our default timestamp formatter so we can see that
everywhere jujutsu shows us timestamps

packetmix/homes/development/jujutsu.nix

···
             signingScriptScriptFSPath;
         };
         snapshot.auto-track = "~(root-glob:'**/.envrc' | root-glob:'**/*.env' | root-glob:'**/.direnv/**/*')";
-        template-aliases.series_log = ''
-          if(root,
-            format_root_commit(self),
-            label(if(current_working_copy, "working_copy"),
-              concat(
-                if(current_working_copy, label("op_log current_operation id", "@"),
-                if(self.contained_in("..@"), label("diff added", "-"),
-                label("diff removed", "+")
-                )),
-                " ",
-                separate(" ",
-                  format_short_change_id_with_hidden_and_divergent_info(self),
-                  format_short_commit_id(commit_id),
-                  git_head,
-                  if(conflict, label("conflict", "conflict")),
-                ) ++ " ",
-                separate(" ",
-                  if(self.contained_in("@.."),
-                    label("rest", separate(" ",
-                      if(empty, "(empty)"),
-                      if(description,
-                        description.first_line(),
-                        "(no description set)",
-                      ),
-                    )),
-                    separate(" ",
-                      if(empty, label("empty", "(empty)")),
-                      if(description,
-                        description.first_line(),
-                        label(if(empty, "empty"), description_placeholder),
-                      ),
-                    )
-                  ),
-                  if(!(current_working_copy || parents), "\033[22m")
-                ) ++ "\n",
-              ),
+        template-aliases = {
+          "format_timestamp(timestamp)" = ''timestamp.local().format("%Y-%m-%d %H:%M:%S") ++ " (" ++ timestamp.ago() ++ ")"'';
+          series_log = ''
+            if(root,
+              format_root_commit(self),
+              label(if(current_working_copy, "working_copy"),
+                concat(
+                  if(current_working_copy, label("op_log current_operation id", "@"),
+                  if(self.contained_in("..@"), label("diff added", "-"),
+                  label("diff removed", "+")
+                  )),
+                  " ",
+                  separate(" ",
+                    format_short_change_id_with_hidden_and_divergent_info(self),
+                    format_short_commit_id(commit_id),
+                    git_head,
+                    if(conflict, label("conflict", "conflict")),
+                  ) ++ " ",
+                  separate(" ",
+                    if(self.contained_in("@.."),
+                      label("rest", separate(" ",
+                        if(empty, "(empty)"),
+                        if(description,
+                          description.first_line(),
+                          "(no description set)",
+                        ),
+                      )),
+                      separate(" ",
+                        if(empty, label("empty", "(empty)")),
+                        if(description,
+                          description.first_line(),
+                          label(if(empty, "empty"), description_placeholder),
+                        ),
+                      )
+                    ),
+                    if(!(current_working_copy || parents), "\033[22m")
+                  ) ++ "\n",
+                ),
+              )
             )
-          )
-        '';
+          '';
+        };
         templates = {
           git_push_bookmark = "'private/${config.home.username}/push-' ++ change_id.short()";
           commit_trailers = ''