Add omarchy-theme-dir and use it to resolve theme paths

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

bin/omarchy-theme-dir

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# omarchy:summary=Print the directory holding a theme, preferring a user-installed copy
+# omarchy:args=<theme-name>
+# omarchy:examples=omarchy theme dir tokyo-night
+
+theme="${1:-}"
+
+if [[ -z $theme ]]; then
+  echo "Usage: omarchy-theme-dir <theme-name>" >&2
+  exit 1
+fi
+
+if [[ -d $HOME/.config/omarchy/themes/$theme ]]; then
+  echo "$HOME/.config/omarchy/themes/$theme"
+else
+  echo "$OMARCHY_PATH/themes/$theme"
+fi