Skip browser policy refresh when browser is not running (#5321)

chromium/brave --refresh-platform-policy blocks forever when the
browser is not already running, hanging omarchy-update entirely.
Guard both calls with pgrep so the policy file is still written
(picked up on next launch) but the blocking refresh is skipped.

Closes #4772

bin/omarchy-theme-set-browser

@@ -14,11 +14,11 @@ if omarchy-cmd-present chromium || omarchy-cmd-present brave; then
 
   if omarchy-cmd-present chromium; then
     echo "{\"BrowserThemeColor\": \"$THEME_HEX_COLOR\", \"BrowserColorScheme\": \"device\"}" | tee "/etc/chromium/policies/managed/color.json" >/dev/null
-    chromium --refresh-platform-policy --no-startup-window &>/dev/null
+    pgrep -x chromium >/dev/null && chromium --refresh-platform-policy --no-startup-window &>/dev/null
   fi
 
   if omarchy-cmd-present brave; then
     echo "{\"BrowserThemeColor\": \"$THEME_HEX_COLOR\", \"BrowserColorScheme\": \"device\"}" | tee "/etc/brave/policies/managed/color.json" >/dev/null
-    brave --refresh-platform-policy --no-startup-window &>/dev/null
+    pgrep -x brave >/dev/null && brave --refresh-platform-policy --no-startup-window &>/dev/null
   fi
 fi