fix timezone refresh

flakes/common/nix_modules/timezone_auto.nix

@@ -20,4 +20,45 @@
     after = [ "dbus.socket" ];
     wants = [ "dbus.socket" ];
   };
+
+  systemd.services.fix-localtime-symlink = {
+    description = "Fix /etc/localtime symlink to be absolute";
+    wantedBy = [ "multi-user.target" ];
+    after = [ "automatic-timezoned.service" ];
+    wants = [ "automatic-timezoned.service" ];
+
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = true;
+      ExecStart = pkgs.writeShellScript "fix-localtime-symlink" ''
+        target=$(${pkgs.coreutils}/bin/readlink /etc/localtime 2>/dev/null || true)
+        if [ -z "$target" ]; then
+          exit 0
+        fi
+
+        if [[ "$target" == /* ]]; then
+          exit 0
+        fi
+
+        abs_target="/etc/$target"
+        if [ -e "$abs_target" ]; then
+          ${pkgs.coreutils}/bin/ln -sf "$abs_target" /etc/localtime
+        fi
+      '';
+    };
+
+    unitConfig = {
+      ConditionPathIsSymbolicLink = "/etc/localtime";
+    };
+  };
+
+  systemd.paths.fix-localtime-symlink = {
+    description = "Watch /etc/localtime for changes";
+    wantedBy = [ "multi-user.target" ];
+
+    pathConfig = {
+      PathChanged = "/etc/localtime";
+      Unit = "fix-localtime-symlink.service";
+    };
+  };
 }