fix(waybar): clock tooltip uses single chrono format block

Two bare `{:%…}` specs emptied the hover tooltip (box with no text).
One strftime block with an embedded newline shows date + zone; ensure
tooltip label colors on generated + summer bars.

themes/boreal/waybar.jsonc

@@ -40,7 +40,7 @@
     "format": "{:%H:%M  ·  %a %d %b}",
     "on-click": "nomarchy-calendar",
     "tooltip": true,
-    "tooltip-format": "{:%A, %d %B %Y}\n{:%Z (UTC%z)}"
+    "tooltip-format": "{:%A, %d %B %Y\n%Z (UTC%z)}"
   },
   "hyprland/workspaces": {
     "disable-scroll": true,