release: bump version to 3.3.0

Update version across all package files and add comprehensive changelog for v3.3.0 release featuring VS Code integration, shared config snippets, enhanced Codex wizard, and cross-platform improvements.

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "CC Switch",
-  "version": "3.2.0",
+  "version": "3.3.0",
   "identifier": "com.ccswitch.desktop",
   "build": {
     "frontendDist": "../dist",