fix: coerce status JSON numeric strings and bump version

Coerce numeric strings in StatusJSON parsing to keep status line rendering resilient with third-party payload tweaks.

Closes #192

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ccstatusline",
-  "version": "2.1.4",
+  "version": "2.1.5",
   "description": "A customizable status line formatter for Claude Code CLI",
   "module": "src/ccstatusline.ts",
   "type": "module",