Log warning instead of error when failing to decode RON in storage (#2961)

* Log warning instead of error when failing to decode RON in storage

* New web demo

* Clean up some warn/error logging

* Avoid deadlock that could happen on crash

* Log errors using console.warn, because console.error can cause crashes

* Use patched version of wasm-bindgen-cli, allowing >2GB memory

* New web demo

crates/eframe/src/epi/mod.rs

@@ -1051,7 +1051,13 @@ impl Storage for DummyStorage {
 pub fn get_value<T: serde::de::DeserializeOwned>(storage: &dyn Storage, key: &str) -> Option<T> {
     storage
         .get_string(key)
-        .and_then(|value| ron::from_str(&value).ok())
+        .and_then(|value| match ron::from_str(&value) {
+            Ok(value) => Some(value),
+            Err(err) => {
+                log::warn!("Failed to decode RON: {err}");
+                None
+            }
+        })
 }
 
 /// Serialize the given value as [RON](https://github.com/ron-rs/ron) and store with the given key.