Update CLAUDE.md with R2 storage learnings

CLAUDE.md

@@ -7,8 +7,8 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 ```bash
 # Development
 pnpm dev          # Start dev server at http://localhost:3000
-pnpm build        # Production build
-pnpm start        # Start production server
+pnpm build         # Production build
+pnpm start         # Start production server
 
 # Database (drizzle)
 pnpm db:push      # Push schema to database
@@ -43,11 +43,12 @@ src/
 │   ├── medical/           # Vaccination tracking
 │   ├── growth/           # Growth charts
 │   ├── memories/         # Photo gallery
-│   ├── menu/            # Navigation menu
+│   ├── menu/             # Navigation menu
 │   ├── onboarding/      # First-time setup
-│   └── login/           # Magic link login
-├── libs/                  # Shared utilities (if any)
-└── styles/               # Global styles
+│   ├── settings/          # Settings with theme picker
+│   └── login/            # Magic link login
+├── ThemeProvider.tsx       # Theme context (light/dark/system/time)
+├── ThemeProvider
 drizzle/                  # Database migrations
 docs/                     # Design docs
 ```
@@ -66,15 +67,24 @@ docs/                     # Design docs
 - **Logs:** Feed, sleep, diaper entries with timestamps
 - **Vaccinations:** IAP schedule tracking
 - **Growth:** Weight/height over time
-- **Memories:** Photos with vision AI tags
+- **Memories:** Photos with R2 storage
 
 ### Key Patterns
 
+**ThemeProvider:** Wrap app in ThemeProvider from layout.tsx. Use `useTheme()` hook in components.
+
+```typescript
+import { useTheme } from "./ThemeProvider";
+const { theme, toggle, setMode } = useTheme();
+// theme: "light" | "dark"
+// mode: "light" | "dark" | "system" | "time"
+```
+
 **Offline Queue:** Uses localStorage (`tia_offline_queue`) for failed API calls, retries when online.
 
-**Chat Sessions:** Stored in localStorage (`tia_chat_sessions`) as array of sessions with messages. Shared between home page AI card and /ai page.
+**Chat Sessions:** Stored in localStorage (`tia_chat_sessions`) - shared between home page AI card and /ai page.
 
-**API Routes:** Return standard JSON `{ entries: [...] }` format for lists.
+**API Routes:** Return standard JSON `{ success: true, items: [...] }` format for lists.
 
 **AI Integration:**
 
@@ -82,17 +92,63 @@ docs/                     # Design docs
 - Model: `minimax-2.7`
 - See `/docs/debugging.md` for troubleshooting
 
+## R2 Storage (Cloudflare)
+
+### Setup
+
+1. **Create bucket** in Cloudflare Dashboard → R2
+2. **Create API token** with "Object Read & Write" permissions
+3. **Enable Public Development URL** in bucket settings (gives pub-*.r2.dev URL)
+
+### API Endpoint Format
+
+The S3 API endpoint is: `https://<accountId>.r2.cloudflarestorage.com`
+
+For your bucket named "tia":
+- Account ID: `e71f22a2f8614fb3ba6d9b28a264d8ce`
+- S3 Endpoint: `https://e71f22a2f8614fb3ba6d9b28a264d8ce.r2.cloudflarestorage.com`
+- Public URL: `https://pub-37a76fd657c94d1dbc521a109c087a11.r2.dev` (no bucket name in path!)
+
+### Code Example
+
+```typescript
+const client = new S3Client({
+  region: "auto",
+  endpoint: `https://${accountId}.r2.cloudflarestorage.com`,
+  credentials: { accessKeyId, secretAccessKey },
+});
+
+// List objects
+const command = new ListObjectsV2Command({ Bucket: "tia" });
+const res = await client.send(command);
+
+// Get presigned upload URL
+const command = new PutObjectCommand({ Bucket: "tia", Key: key, ContentType });
+const url = await getSignedUrl(client, command, { expiresIn: 3600 });
+```
+
+### Key Learnings
+
+1. **S3 API endpoint** does NOT include bucket name: `https://...r2.cloudflarestorage.com`
+2. **Public URL** does NOT include bucket path: `https://pub-...r2.dev` (NOT `/tia/...`)
+3. **CORS** needs GET and PUT methods for uploads
+4. ListObjects needs bucket name in command, not endpoint
+
 ## Environment Variables
 
 Set in `.env.local` for development, or in Dokploy dashboard for production.
 
-See `.env.example` for all required vars. Key ones:
+Required:
 
 - `DATABASE_URL` - PostgreSQL connection
 - `AUTH_SECRET` - NextAuth secret
-- `LITELLM_BASE_URL` - AI gateway URL
-- `LITELLM_API_KEY` - AI API key
 - `R2_ACCOUNT_ID` - Cloudflare R2 account ID
 - `R2_ACCESS_KEY_ID` - R2 access key
 - `R2_SECRET_ACCESS_KEY` - R2 secret key
-- `R2_BUCKET_NAME` - R2 bucket name
+- `R2_BUCKET_NAME` - R2 bucket name (e.g., "tia")
+- `R2_PUBLIC_URL` - Public R2 URL (e.g., `https://pub-...r2.dev`)
+
+Optional for AI:
+
+- `LITELLM_BASE_URL` - AI gateway URL
+- `LITELLM_API_KEY` - AI API key