diff --git a/src/app.d.ts b/src/app.d.ts
index 9b354164..f858fd58 100644
--- a/src/app.d.ts
+++ b/src/app.d.ts
@@ -23,6 +23,17 @@ declare global {
     var native_app: any;
 }
 
+// @lucide/svelte ≥ 0.577.0 dropped `class` from IconProps — it now derives props purely from
+// SVGAttributes<SVGSVGElement>, which TypeScript types without `class` (uses `className` instead).
+// Every <SomeIcon class="..." /> site in the codebase errors without this augmentation.
+// If a future lucide update re-adds `class` natively, this becomes a harmless no-op.
+// Root cause: @lucide/svelte 0.561.0 → 0.577.0 bump in chore commit 366c6629 (2026-03-10).
+declare module '@lucide/svelte' {
+    interface IconProps {
+        class?: string;
+    }
+}
+
 // Stripe Buy Button web component — needed so Svelte templates accept the element without TS errors.
 declare module 'svelte/elements' {
     interface IntrinsicElements {