fix: Mac desktop updater — platform-aware errors, HTTPS latest.json

Show Mac-specific update errors on macOS (not Windows message). Force HTTPS
bundle URLs, fix reconcile version from bundle filenames, bump to 0.1.4.

Co-authored-by: Cursor <cursoragent@cursor.com>

desktop/src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "GoldenChart",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "identifier": "com.goldenchart.desktop",
   "build": {
     "beforeDevCommand": "npm run dev",