fix failing cypress tests

Author: jderochervlk

cypress/support/e2e.js

@@ -7,11 +7,19 @@ const knownHydrationErrors = [
   /Minified React error #425\b/,
 ];
 
+const knownPlaygroundBootstrapErrors = [
+  /Sys_error.*file already exists/i,
+  /\/static\/Belt\.cmi\s*:\s*file already exists/i,
+];
+
 Cypress.on("uncaught:exception", (err) => {
   const message = err && err.message ? err.message : "";
   const isKnownHydrationError = knownHydrationErrors.some((pattern) =>
     pattern.test(message),
   );
+  const isKnownPlaygroundBootstrapError = knownPlaygroundBootstrapErrors.some(
+    (pattern) => pattern.test(message),
+  );
 
   if (isKnownHydrationError) {
     console.warn("Suppressing known React hydration exception in Cypress:", {
@@ -20,4 +28,15 @@ Cypress.on("uncaught:exception", (err) => {
     });
     return false;
   }
+
+  if (isKnownPlaygroundBootstrapError) {
+    console.warn(
+      "Suppressing known Playground bootstrap exception in Cypress:",
+      {
+        message,
+        error: err,
+      },
+    );
+    return false;
+  }
 });

e2e/Playground.cy.res

@@ -81,17 +81,26 @@ describe("Playground", () => {
 
     // Verify playground shell is in light mode
     get("main")->shouldWithValue("have.class", "playground-theme-light")->ignore
+    cyWindow()
+    ->its("localStorage")
+    ->invokeWithArg("getItem", "playgroundTheme")
+    ->shouldWithValue("eq", "light")
+    ->ignore
 
     // Switch back to dark mode from Settings
     contains("Settings")->click->ignore
-    contains("Playground Theme")
-    ->closest("div")
+    get("main")
     ->find("button")
     ->containsChainable("Dark")
     ->click
     ->ignore
 
     // Verify playground shell is back to dark mode
     get("main")->shouldWithValue("have.class", "playground-theme-dark")->ignore
+    cyWindow()
+    ->its("localStorage")
+    ->invokeWithArg("getItem", "playgroundTheme")
+    ->shouldWithValue("eq", "dark")
+    ->ignore
   })
 })