Add Theme Menu Switcher (#154)

* Add theme menu for quick theme switching

* Bind theme menu

* Fix current theme being selected

* Replace omarchy-theme-next binding with theme menu

* Add omarchy-theme-set and refactor theme menu script

* Add solid black fallback if background image does not exist in current theme

bin/omarchy-theme-menu

@@ -0,0 +1,55 @@
+#!/bin/bash
+
+# Theme menu for Omarchy
+# Provides an interactive dmenu to switch between available themes
+
+THEMES_DIR="$HOME/.config/omarchy/themes/"
+CURRENT_THEME_DIR="$HOME/.config/omarchy/current/theme"
+
+# Show theme selection menu and apply changes
+show_theme_menu() {
+  # Get current theme name
+  if [[ -e "$CURRENT_THEME_DIR" ]]; then
+    CURRENT_THEME_NAME=$(basename "$(realpath "$CURRENT_THEME_DIR")")
+  else
+      CURRENT_THEME_NAME="unknown"
+  fi
+  
+  # Build menu options from available themes
+  local themes=($(find "$THEMES_DIR" -mindepth 1 -maxdepth 1 -type d -printf "%f\n" | sort))
+  
+  # Remove the current theme from the list before building the menu
+  local filtered_themes=()
+  for theme in "${themes[@]}"; do
+    if [[ "$theme" != "$CURRENT_THEME_NAME" ]]; then
+      filtered_themes+=("$theme")
+    fi
+  done
+
+  # Add current theme to the top of menu
+  local wofi_input=$'\uf0a9 '"${CURRENT_THEME_NAME}"
+  for theme in "${filtered_themes[@]}"; do
+    wofi_input+="\n${theme}"
+  done
+  
+  # Display theme selection menu
+  local selection=$(echo -e "$wofi_input" | wofi \
+    --show dmenu \
+    --width 300 \
+    --height 225 \
+    --style ~/.local/share/omarchy/default/wofi/select.css)
+  
+  # Extract theme name from selection (remove glyph and leading spaces)
+  local selected_theme=$(echo "$selection" | sed 's/^\s*\uf0a9 \?//')
+
+  # Exit if the selected theme is the current theme or empty
+  if [[ -z "$selected_theme" || "$selected_theme" == "$CURRENT_THEME_NAME" ]]; then
+    exit 0
+  fi
+
+  # Apply the new theme with omarchy-theme-set
+  "$HOME/.local/share/omarchy/bin/omarchy-theme-set" "$selected_theme"
+}
+
+# Main execution
+show_theme_menu