upd

desktop/waybar/config.jsonc

@@ -107,7 +107,8 @@
             "tooltip-format": "{desc}"
         },
         "clock": {
-            "format": "{:%I:%M %p %a, %b %d}",
+            "format": "{:%H:%M %a, %b %d}",
+            "timezone": "America/New_York",
             "tooltip": true,
             "tooltip-format": "<tt>{calendar}</tt>",
             "calendar": {
@@ -151,7 +152,8 @@
             "sort-by-number": true
         },
         "clock#portrait": {
-            "format": "{:%I:%M %p}",
+            "format": "{:%H:%M}",
+            "timezone": "America/New_York",
             "tooltip": true,
             "tooltip-format": "<tt>{calendar}</tt>",
             "calendar": {

desktop/waybar/scripts/logout-menu.py

@@ -4,15 +4,34 @@ import shutil
 import subprocess
 import sys
 
+
+def _shutdown_cmd() -> str:
+    """Clean logout command for this session.
+
+    The session runs under UWSM (hyprland-uwsm). There, `hyprctl dispatch exit`
+    can leave SDDM on a black screen instead of logging out, while `uwsm stop`
+    tears the session down cleanly. Fall back to the compositor dispatcher when
+    UWSM is not in use.
+    """
+    if shutil.which("uwsm"):
+        return "uwsm stop"
+    return "hyprctl dispatch exit"
+
+
 ENTRIES = [
-    ("Lock", "command -v hyprlock >/dev/null 2>&1 && exec hyprlock"),
-    ("Log out", "hyprctl dispatch exit"),
+    ("Lock", "hyprlock"),
+    ("Log out", _shutdown_cmd()),
     ("Suspend", "systemctl suspend"),
     ("Reboot", "systemctl reboot"),
     ("Shut down", "systemctl poweroff"),
 ]
 
 
+def _notify(message: str) -> None:
+    if shutil.which("notify-send"):
+        subprocess.Popen(["notify-send", "Session menu", message])
+
+
 def main() -> int:
     if not shutil.which("fuzzel"):
         print("fuzzel not found", file=sys.stderr)
@@ -27,9 +46,14 @@ def main() -> int:
     )
     choice = result.stdout.strip()
     for name, command in ENTRIES:
-        if name == choice:
-            subprocess.Popen(["sh", "-c", command])
-            break
+        if name != choice:
+            continue
+        program = command.split()[0]
+        if not shutil.which(program):
+            _notify(f"{program} not found")
+            return 1
+        subprocess.Popen(["sh", "-c", command])
+        break
     return 0