ssb: Enough plumbing that if a blob is received, we will try to load the image again.

apps/ssb/app.js

@@ -76,6 +76,9 @@ tfrpc.register(function setHash(hash) {
 core.register('onMessage', async function (id) {
 	await tfrpc.rpc.notifyNewMessage(id);
 });
+core.register('onBlob', async function (id) {
+	await tfrpc.rpc.notifyNewBlob(id);
+});
 tfrpc.register(async function store_blob(blob) {
 	if (Array.isArray(blob)) {
 		blob = Uint8Array.from(blob);