feat: add Git sync feature with IPC handlers and types for connection management, push, and pull operations

Author: Cyneric

.env.example

@@ -0,0 +1,6 @@
+# GitHub OAuth App credentials for the "Connect with GitHub" quick setup flow.
+# Register an OAuth App at https://github.com/settings/developers and fill in
+# the values below. The callback URL should be http://localhost (any port).
+# Never commit the actual .env file — only this .env.example.
+VITE_GITHUB_CLIENT_ID=
+VITE_GITHUB_CLIENT_SECRET=

TASK.md

@@ -59,9 +59,9 @@ affected unit tests pass, and both `pnpm build` and `pnpm lint` succeed.
 
 ## Phase 5 — Cloud + Registry
 
-- [ ] 39. Git sync: GitHub OAuth quick setup flow
-- [ ] 40. Git sync: Advanced manual setup (any Git provider)
-- [ ] 41. Push/pull with conflict detection and merge
+- [x] 39. Git sync: GitHub OAuth quick setup flow
+- [x] 40. Git sync: Advanced manual setup (any Git provider)
+- [x] 41. Push/pull with conflict detection and merge
 - [ ] 42. Smithery registry API client
 - [ ] 43. Registry browser page
 - [ ] 44. One-click install from registry (Pro feature)

package.json

@@ -43,6 +43,7 @@
     "electron-log": "^5.2.4",
     "electron-updater": "^6.3.9",
     "i18next": "^25.8.14",
+    "isomorphic-git": "^1.37.2",
     "keytar": "^7.9.0",
     "lucide-react": "^0.577.0",
     "react-hook-form": "^7.71.2",