feat: move snippets, keybinding actions and macros out of core into plugins

plugins/snippets/src/frontend/SnippetOverlay.tsx

@@ -0,0 +1,32 @@
+import { useEffect } from "react";
+import { useSettings } from "@termix/plugin-sdk/frontend";
+import { SnippetVariablesDialog } from "./SnippetVariablesDialog";
+import { readSnippetSettings } from "./settings";
+import { setConfirmExecution, usePendingPrompt } from "./prompt-store";
+
+/**
+ * Always mounted at the shell's root (the shell.overlay slot), so a snippet
+ * started from the command palette, a keybinding or a host button can ask
+ * for its inputs after whatever started it has closed.
+ */
+export function SnippetOverlay() {
+  const settings = useSettings("user");
+  const prompt = usePendingPrompt();
+  const confirmExecution = readSnippetSettings(
+    settings.values,
+  ).confirmExecution;
+
+  useEffect(() => {
+    setConfirmExecution(confirmExecution);
+  }, [confirmExecution]);
+
+  if (!prompt) return null;
+  return (
+    <SnippetVariablesDialog
+      snippet={prompt.snippet}
+      host={prompt.host}
+      onCancel={() => prompt.settle(null)}
+      onConfirm={(_resolved, values) => prompt.settle(values)}
+    />
+  );
+}