docs(01-01): complete Supabase integration plan

Tasks completed: 3/3
- Initialize Flutter project with Supabase dependencies
- Create secure Supabase configuration system
- Initialize Supabase in main.dart

SUMMARY: .planning/phases/01-authentication/01-01-SUMMARY.md
USER-SETUP: .planning/phases/01-authentication/01-USER-SETUP.md

.planning/phases/01-authentication/01-USER-SETUP.md

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+# Phase 1: User Setup Required
+
+**Generated:** 2026-01-28
+**Phase:** 01-authentication
+**Status:** Incomplete
+
+## Environment Variables
+
+| Status | Variable | Source | Add to |
+|--------|----------|--------|----------|
+| [ ] | `SUPABASE_URL` | Supabase Dashboard → Settings → API → Project URL | `.env` |
+| [ ] | `SUPABASE_ANON_KEY` | Supabase Dashboard → Settings → API → anon/public key | `.env` |
+
+## Dashboard Configuration
+
+- [ ] **Configure redirect URLs for password reset**
+  - Location: Supabase Dashboard → Authentication → URL Configuration
+  - Add: `com.example.sage://reset-callback` (adjust for your app scheme)
+  - Add: `https://your-domain.com/auth/callback` (for web deployment)
+
+## Account Setup
+
+1. **Create Supabase Project**
+   - Go to https://supabase.com/dashboard
+   - Click "New Project"
+   - Choose organization (create new if needed)
+   - Set project name: "Sage" or your preferred name
+   - Choose database password (save securely)
+
+2. **Get Configuration Values**
+   - After project creation, navigate to Settings → API
+   - Copy "Project URL" (starts with https://)
+   - Copy "anon public" key (starts with eyJhb...)
+
+3. **Configure Environment Variables**
+   ```bash
+   # Copy .env.example to .env
+   cp .env.example .env
+   
+   # Edit .env with your actual values
+   nano .env
+   ```
+
+4. **Verify Configuration**
+   ```bash
+   # Test Flutter app with real credentials
+   flutter run
+   ```
+
+## Local Development
+
+For local development with Flutter:
+```bash
+# Install dependencies (already done)
+flutter pub get
+
+# Run with real Supabase credentials
+flutter run
+```
+
+## Verification
+
+Once setup is complete, verify:
+
+```bash
+# Check environment variables are loaded
+flutter test test/widget_test.dart
+
+# Should see "Supabase initialized successfully" in console
+# No authentication errors should occur
+```
+
+## Next Steps
+
+After completing this setup:
+
+1. Run `flutter run` to verify Supabase connection works
+2. Environment variables should load without errors
+3. App should display "Supabase connection: ✓ Ready" on home screen
+4. Ready for Phase 1 Plan 2 (Authentication UI implementation)
+
+---
+
+**Once all items complete:** Mark status as "Complete"