Update charts in README.md

Author: aaronshaf

README.md

@@ -109,22 +109,30 @@ export const queryClient = new QueryClient({
 
 ```mermaid
 flowchart TD
-    Application([Client app]) --> |".setItem()"| IDBCache[[IDBCache]]
-    IDBCache -.-> |"Unencrypted chunks"| WebWorker{{Web Worker}}
-    WebWorker -.-> |"Encrypted chunks"| IDBCache
-    IDBCache -.-> |"Encrypted chunks"| IndexedDB[(IndexedDB)]
+ subgraph Browser["Browser"]
+        IDBCache[["IDBCache"]]
+        Application(["Client app"])
+        WebWorker{{"Web Worker"}}
+        IndexedDB[("IndexedDB")]
+  end
+    Application -- ".setItem()" --> IDBCache
+    IDBCache -. Unencrypted chunks .-> WebWorker
+    WebWorker -. Encrypted chunks .-> IDBCache
+    IDBCache -. Encrypted chunks .-> IndexedDB
 ```
 
 ### getItem
 
 ```mermaid
 flowchart TD
+ subgraph Browser["Browser"]
     Application([Client app]) --> |".getItem()"| IDBCache[[IDBCache]]
     IDBCache --> |Get chunks| IndexedDB[(IndexedDB)]
     IndexedDB -.-> |Encrypted chunks| IDBCache
     IDBCache -.-> |Encrypted chunks| WebWorker{{Web Worker}}
     WebWorker -.-> |Decrypted chunks| IDBCache
     IDBCache --> |"Item"| Application
+  end
 ```
 
 ## Technologies used
@@ -145,4 +153,4 @@ flowchart TD
 
 - [Is postMessage slow?](https://surma.dev/things/is-postmessage-slow/)
 - [Measure performance with the RAIL model](https://web.dev/articles/rail)
-- [LocalStorage vs. IndexedDB vs. Cookies vs. OPFS vs. WASM-SQLite](https://rxdb.info/articles/localstorage-indexeddb-cookies-opfs-sqlite-wasm.html)
+- [LocalStorage vs. IndexedDB vs. Cookies vs. OPFS vs. WASM-SQLite](https://rxdb.info/articles/localstorage-indexeddb-cookies-opfs-sqlite-wasm.html)