Swallow errors in LogStore write chain

A single failed KvStore.set() could poison the promise chain,
causing all subsequent writes and flush() to reject.  It could
also trigger an unhandled rejection since the synchronous Sink
never awaits the result.  Catch and discard errors so logging
remains best-effort.

#564 (comment)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: dahlia

packages/debugger/src/mod.tsx

@@ -114,7 +114,11 @@ class LogStore {
         Math.random().toString(36).slice(2)
       }`,
     ] as unknown as KvKey;
-    this.#pending = this.#pending.then(() => this.#kv.set(key, record));
+    // Errors are swallowed so a single failed write cannot poison the
+    // chain or cause an unhandled rejection — logging is best-effort.
+    this.#pending = this.#pending.then(
+      () => this.#kv.set(key, record),
+    ).catch(() => {});
   }
 
   /** Wait for all pending writes to complete. */