fix(desktop): unfree CLI default, bar icon spacing, unified clock

Hardware findings on Latitude: nix-shell blocked unfree; whole-swap
bars collided icon+percentage; clock needed calcurse + one module.

- Export NIXPKGS_ALLOW_UNFREE=1 + ~/.config/nixpkgs/config.nix
- Mono Nerd face + trailing spaces on battery/volume icons (all bars)
- Single clock `HH:MM · Day DD Mon`; calcurse ships with waybar
- V3 queue entries for laptop re-check

Verification: V0 — nix flake check --no-build green; V2/V3 pending on
session (user-visible bar + CLI unfree).

themes/summer-day/waybar.css

@@ -48,7 +48,6 @@ window#waybar {
 #custom-recording,
 #idle_inhibitor,
 #clock,
-#clock-date,
 #workspaces,
 #pulseaudio,
 #custom-powerprofile,

themes/summer-day/waybar.jsonc

@@ -9,7 +9,7 @@
   "spacing": 15,
   "reload_style_on_change": true,
 
-  "modules-left": ["custom/launcher", "clock", "clock#date"],
+  "modules-left": ["custom/launcher", "clock"],
   "modules-center": ["hyprland/workspaces"],
   "modules-right": ["custom/recording", "idle_inhibitor", "pulseaudio", "custom/powerprofile", "custom/nightlight", "hyprland/language", "custom/updates", "battery", "tray", "custom/vpn", "custom/doctor", "custom/notification", "custom/powermenu"],
 
@@ -37,18 +37,18 @@
   },
 
   "pulseaudio": {
-    "format": "<span size='13pt'>{icon}</span>  {volume}%",
-    "format-bluetooth": "<span size='13pt'>{icon} </span>  {volume}%",
+    "format": "<span size='13pt'>{icon}</span>{volume}%",
+    "format-bluetooth": "<span size='13pt'>{icon}  </span>{volume}%",
     "format-bluetooth-muted": "  muted",
-    "format-muted": "<span size='13pt'></span> muted",
+    "format-muted": "<span size='13pt'> </span>muted",
     "format-icons": {
-      "headphone": "",
-      "hands-free": "",
-      "headset": "",
-      "phone": "",
-      "portable": "",
-      "car": "",
-      "default": ["", "", ""]
+      "headphone": " ",
+      "hands-free": " ",
+      "headset": " ",
+      "phone": " ",
+      "portable": " ",
+      "car": " ",
+      "default": [" ", " ", " "]
     },
     "on-click": "wpctl set-mute @DEFAULT_AUDIO_SINK@ toggle",
     "on-click-right": "pwvucontrol",
@@ -58,26 +58,21 @@
   "battery": {
     "interval": 60,
     "states": { "warning": 25, "critical": 10 },
-    "max-length": 10,
-    "format": "<span size='13pt'>{icon}</span>  {capacity}%",
-    "format-charging": "<span size='13pt'></span> {capacity}%",
-    "format-plugged": "<span size='13pt'></span> {capacity}%",
-    "format-full": " 100%",
-    "format-icons": ["", "", "", "", ""],
+    "max-length": 14,
+    "format": "<span size='13pt'>{icon}</span>{capacity}%",
+    "format-charging": "<span size='13pt'> </span>{capacity}%",
+    "format-plugged": "<span size='13pt'> </span>{capacity}%",
+    "format-full": "  100%",
+    "format-icons": [" ", " ", " ", " ", " "],
     "on-click": "nomarchy-menu powermgmt",
     "tooltip-format": "Battery status"
   },
 
   "clock": {
-    "format": " {:%H:%M}",
+    "format": " {:%H:%M  ·  %a %d %b}",
     "on-click": "nomarchy-calendar",
     "tooltip": true,
-    "tooltip-format": "{:%Z (UTC%z)}\n<tt><small>{calendar}</small></tt>"
-  },
-
-  "clock#date": {
-    "format": " {:%A, %B %d, %Y}",
-    "tooltip": false
+    "tooltip-format": "{:%A %d %B %Y}\n{:%Z (UTC%z)}\n<tt><small>{calendar}</small></tt>"
   },
 
   "tray": { "spacing": 8 },