Replace bar-settings with unified settings plugin

Consolidates bar-settings into a single 'settings' plugin with sidebar
categories: Defaults, Style, Bar, System, Plugins. Updates supporting
commands (omarchy-launch-settings, omarchy-style-corners-quickshell,
omarchy-theme-list-with-previews, omarchy-hyprland-monitor-scaling-set)
and refreshes sidebar glyphs to Nerd Font icons.

bin/omarchy-style-corners-quickshell

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+# omarchy:summary=Set or toggle corner radius for the omarchy-shell menu and settings panel
+# omarchy:args=[toggle|sharp|round]
+# omarchy:examples=omarchy style corners quickshell toggle | omarchy style corners quickshell round | omarchy style corners quickshell sharp
+
+STYLE_FILE="$HOME/.local/state/omarchy/toggles/quickshell-menu.json"
+
+current_radius() {
+  [[ -f $STYLE_FILE ]] || { echo 0; return; }
+  local r
+  r=$(grep -oE '"radius"[[:space:]]*:[[:space:]]*[0-9]+' "$STYLE_FILE" | grep -oE '[0-9]+$')
+  echo "${r:-0}"
+}
+
+set_radius() {
+  local radius="$1"
+  mkdir -p "$(dirname "$STYLE_FILE")"
+  printf '{ "radius": %s }\n' "$radius" >"$STYLE_FILE"
+}
+
+case "${1:-toggle}" in
+  round) set_radius 6 ;;
+  sharp) set_radius 0 ;;
+  toggle)
+    if (( $(current_radius) > 0 )); then
+      set_radius 0
+    else
+      set_radius 6
+    fi
+    ;;
+  *)
+    echo "Usage: omarchy-style-corners-quickshell [toggle|sharp|round]"
+    exit 1
+    ;;
+esac