fix: use actual version in install script (#7044)

install

@@ -208,11 +208,8 @@ check_version() {
     if command -v opencode >/dev/null 2>&1; then
         opencode_path=$(which opencode)
 
-
-        ## TODO: check if version is installed
-        # installed_version=$(opencode version)
-        installed_version="0.0.1"
-        installed_version=$(echo $installed_version | awk '{print $2}')
+        ## Check the installed version
+        installed_version=$(opencode --version 2>/dev/null || echo "")
 
         if [[ "$installed_version" != "$specific_version" ]]; then
             print_message info "${MUTED}Installed version: ${NC}$installed_version."