feat: bump version to 0.14.0

Includes all changes from this release cycle:
- Top header navigation (sidebar removed)
- Accounts screen decomposition and visual redesign
- Dev/prod environment isolation
- Usage Analytics with accurate averages, cost reporting, OpenRouter pricing
- Monitor moved to Usage with per-request token/cost tracking
- Clickable traffic logs with expandable JSON body viewer
- OpenCode IDE config in Quick Setup
- API Proxy reorganization (flattened tabs)
- CI/CD pipeline fixes (release config, Node version, pnpm alignment)
- Repository cleanup (~80MB of binaries removed)

package.json

@@ -1,7 +1,7 @@
 {
   "name": "gemini-nexus",
   "productName": "Gemini Nexus",
-  "version": "0.13.1",
+  "version": "0.14.0",
   "description": "Gemini Nexus - Electron App",
   "main": ".vite/build/main.js",
   "private": true,