refactor: improve XLM detection and enable multi-path pre-launch script installation

installer.sh

@@ -202,10 +202,10 @@ XLM_PATHS=(
     "$HOME/.steam/root/compatibilitytools.d/xlm"
 )
 
-XLM_FOUND=""
+XLM_FOUND=false
 for p in "${XLM_PATHS[@]}"; do
     if [ -d "$p" ]; then
-        XLM_FOUND="$p"
+        XLM_FOUND=true
         break
     fi
 done
@@ -214,11 +214,15 @@ echo "Would you like to install the wrapper as a pre-launch script for XLM?"
 echo "This allows the OTP injector to run automatically when launching FFXIV via Steam with XLM."
 read -p "Install as XLM pre-launch script? [Y/n]: " INSTALL_PRELAUNCH
 if [[ ! "$INSTALL_PRELAUNCH" =~ ^[Nn]$ ]]; then
-    if [ -n "$XLM_FOUND" ]; then
-        echo "Found XLM at $XLM_FOUND"
-        mkdir -p "$XLM_FOUND/prelaunch.d"
-        ln -sf "$BIN_DIR/xivlauncher-wrapper" "$XLM_FOUND/prelaunch.d/xivlauncher-wrapper"
-        echo "Successfully linked wrapper to $XLM_FOUND/prelaunch.d/"
+    if [ "$XLM_FOUND" = true ]; then
+        for p in "${XLM_PATHS[@]}"; do
+            if [ -d "$p" ]; then
+                echo "Found XLM at $p"
+                mkdir -p "$p/prelaunch.d"
+                ln -sf "$BIN_DIR/xivlauncher-wrapper" "$p/prelaunch.d/xivlauncher-wrapper"
+                echo "Successfully linked wrapper to $p/prelaunch.d/"
+            fi
+        done
     else
         echo "Could not automatically detect XLM installation path."
         echo "If you have XLM installed, please enter the path to your XLM compatibility tool folder."