feat: add Firebase Google sign-in and contraction cloud history

.env.example

@@ -0,0 +1,7 @@
+VITE_FIREBASE_API_KEY=
+VITE_FIREBASE_AUTH_DOMAIN=
+VITE_FIREBASE_PROJECT_ID=
+VITE_FIREBASE_STORAGE_BUCKET=
+VITE_FIREBASE_MESSAGING_SENDER_ID=
+VITE_FIREBASE_APP_ID=
+VITE_FIREBASE_MEASUREMENT_ID=

.github/workflows/pages-release.yml

@@ -1,6 +1,10 @@
 name: Deploy to GitHub Pages
 
 on:
+  push:
+    branches:
+      - master
+      - main
   workflow_dispatch:
 
 permissions:
@@ -18,6 +22,14 @@ jobs:
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}
+    env:
+      GITHUB_PAGES: "true"
+      VITE_FIREBASE_API_KEY: ${{ secrets.VITE_FIREBASE_API_KEY }}
+      VITE_FIREBASE_AUTH_DOMAIN: ${{ secrets.VITE_FIREBASE_AUTH_DOMAIN }}
+      VITE_FIREBASE_PROJECT_ID: ${{ secrets.VITE_FIREBASE_PROJECT_ID }}
+      VITE_FIREBASE_STORAGE_BUCKET: ${{ secrets.VITE_FIREBASE_STORAGE_BUCKET }}
+      VITE_FIREBASE_MESSAGING_SENDER_ID: ${{ secrets.VITE_FIREBASE_MESSAGING_SENDER_ID }}
+      VITE_FIREBASE_APP_ID: ${{ secrets.VITE_FIREBASE_APP_ID }}
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4

docs/FIREBASE_SETUP.md

@@ -0,0 +1,52 @@
+# Firebase Setup (GitHub Pages)
+
+## 1) Create Firebase project
+
+1. Open Firebase Console and create/select your project.
+2. Add a **Web App**.
+3. Copy the Firebase config values.
+
+## 2) Enable authentication
+
+1. Firebase Console → Authentication → Sign-in method.
+2. Enable **Google** provider.
+3. Add authorized domains:
+   - `localhost`
+   - `<your-github-username>.github.io`
+
+## 3) Enable Firestore
+
+1. Firebase Console → Firestore Database → Create database.
+2. Start in production mode.
+3. Use these security rules:
+
+```txt
+rules_version = '2';
+service cloud.firestore {
+  match /databases/{database}/documents {
+    match /users/{userId}/contractions/{docId} {
+      allow read, write: if request.auth != null && request.auth.uid == userId;
+    }
+  }
+}
+```
+
+## 4) Local development config
+
+1. Copy `.env.example` to `.env`.
+2. Paste your Firebase config values.
+3. Run `npm run dev`.
+
+## 5) GitHub Pages secrets
+
+In GitHub repo settings, add Actions secrets:
+
+- `VITE_FIREBASE_API_KEY`
+- `VITE_FIREBASE_AUTH_DOMAIN`
+- `VITE_FIREBASE_PROJECT_ID`
+- `VITE_FIREBASE_STORAGE_BUCKET`
+- `VITE_FIREBASE_MESSAGING_SENDER_ID`
+- `VITE_FIREBASE_APP_ID`
+- `VITE_FIREBASE_MEASUREMENT_ID` (optional)
+
+The Pages workflow injects these at build time.