diff --git a/package.json b/package.json
index c5628b8..e6ff0ef 100644
--- a/package.json
+++ b/package.json
@@ -2,6 +2,9 @@
     "name": "postguard-website",
     "version": "1.7.0",
     "private": true,
+    "engines": {
+        "node": ">=20"
+    },
     "scripts": {
         "dev": "vite dev",
         "build": "vite build",
diff --git a/src/lib/components/filesharing/SendButton.svelte b/src/lib/components/filesharing/SendButton.svelte
index 4e3db81..ad31a42 100644
--- a/src/lib/components/filesharing/SendButton.svelte
+++ b/src/lib/components/filesharing/SendButton.svelte
@@ -304,6 +304,12 @@
     let buttonRef: HTMLButtonElement | null = $state(null)
     let dialogRef: HTMLDialogElement | null = $state(null)
 
+    // Computed here as a script-level $derived rather than inline in the template
+    // via {@const} to dodge an upstream prettier-plugin-svelte crash on ternaries
+    // with a BinaryExpression test inside {@const}
+    // (https://github.com/sveltejs/prettier-plugin-svelte/issues/528). The pinned
+    // ^4.0.1 already includes the #528 fix, so this can move back inline as a
+    // {@const} ternary once verified with `prettier --check` on 4.0.1.
     let totalProgress = $derived(
         encryptState.percentages.length > 0
             ? Math.round(