Update Prism Notes branding and OneNote sync UI

README.md

@@ -31,3 +31,19 @@ Open http://localhost:3030 and sign in with Microsoft.
 - `getGraphToken()` in `server.ts` is ready for Graph API calls; extend with additional routes as needed.
 - `/api/submit` validates the provided `pbToken` then writes the payload to `PB_COLLECTION`; adjust fields to match your schema.
 - Static file serving uses `index.html` from the repo root.
+
+## OneNote sync (append MVP)
+- Backend endpoint: `POST /api/onenote/append`
+- Required headers:
+	- `Authorization: Bearer <delegated Microsoft access token>`
+	- `x-pb-token: <PocketBase user token>`
+- Current hardcoded target in `server.ts`:
+	- Host: `czflex.sharepoint.com`
+	- Site path: `/sites/Team`
+	- Section ID: `ed504699-67be-47a3-838a-e01ec17198fb`
+	- Page ID: `addbbca7-18ce-4d8d-833e-96cc08d990bc`
+- Frontend buttons:
+	- New note: `Submit + Sync OneNote`
+	- Note detail: `Sync to OneNote`
+
+Important: sync requires a delegated Microsoft token with OneNote write permissions. The UI captures this from PocketBase Microsoft OAuth metadata when available.