community: a proposal on your board arrives as a toast, carried sealed through the inbox

src/App.svelte

@@ -26,6 +26,7 @@
     import ImportToast from "./components/ImportToast.svelte";
     import ResolverToast from "./components/ResolverToast.svelte";
     import UploadToast from "./components/UploadToast.svelte";
+    import ProposalToast from "./components/ProposalToast.svelte";
     import SetlistScanChip from "./components/SetlistScanChip.svelte";
     import {
         ui,
@@ -180,6 +181,7 @@
     <ImportToast />
     <ResolverToast />
     <UploadToast />
+    <ProposalToast />
     <SetlistScanChip />
     <PreviewOverlay />
     <LyricsSyncEditor />