fix(e2e): cross-protocol browser.execute() — works with both WebDriver + CDP

Root cause: WebDriverIO devtools protocol wraps functions in a polyfill
that puts `return` inside eval() (not a function body) → "Illegal return".

Fix: exec() wrapper in helpers/execute.ts converts function args to IIFE
strings before passing to browser.execute(). Works identically on both
WebDriver (Tauri) and CDP/devtools (Electrobun CEF).

- 35 spec files updated (browser.execute → exec)
- 4 config files updated (string-form expressions)
- helpers/actions.ts + assertions.ts updated
- 560 vitest + 116 cargo passing

tests/e2e/specs/phase-d-errors.test.ts

@@ -1,4 +1,5 @@
 import { browser, expect } from '@wdio/globals';
+import { exec } from '../helpers/execute.ts';
 
 // Phase D — Error Handling UI Tests (D4–D5)
 // Tests toast notifications, notification center, and error state handling.
@@ -10,14 +11,14 @@ async function resetToHomeState(): Promise<void> {
   // Close settings panel if open
   const panel = await browser.$('.sidebar-panel');
   if (await panel.isDisplayed().catch(() => false)) {
-    await browser.execute(() => {
+    await exec(() => {
       const btn = document.querySelector('.settings-close') || document.querySelector('.panel-close');
       if (btn) (btn as HTMLElement).click();
     });
     await browser.pause(300);
   }
   // Close notification panel if open
-  await browser.execute(() => {
+  await exec(() => {
     const panel = document.querySelector('[data-testid="notification-panel"]');
     if (panel) {
       const backdrop = document.querySelector('.notification-center .backdrop');
@@ -50,7 +51,7 @@ describe('Scenario D4 — Toast Notifications', () => {
 
   it('should show notification dropdown when bell clicked', async () => {
     // Click bell via JS for reliability
-    await browser.execute(() => {
+    await exec(() => {
       const bell = document.querySelector('[data-testid="notification-bell"]');
       if (bell) (bell as HTMLElement).click();
     });
@@ -60,7 +61,7 @@ describe('Scenario D4 — Toast Notifications', () => {
     await expect(panel).toBeDisplayed();
 
     // Verify panel has a title
-    const title = await browser.execute(() => {
+    const title = await exec(() => {
       const el = document.querySelector('[data-testid="notification-panel"] .panel-title');
       return el?.textContent?.trim() ?? '';
     });
@@ -69,11 +70,11 @@ describe('Scenario D4 — Toast Notifications', () => {
 
   it('should show panel actions area in notification center', async () => {
     // Panel should still be open from previous test
-    const panelExists = await browser.execute(() => {
+    const panelExists = await exec(() => {
       return document.querySelector('[data-testid="notification-panel"]') !== null;
     });
     if (!panelExists) {
-      await browser.execute(() => {
+      await exec(() => {
         const bell = document.querySelector('[data-testid="notification-bell"]');
         if (bell) (bell as HTMLElement).click();
       });
@@ -89,7 +90,7 @@ describe('Scenario D4 — Toast Notifications', () => {
     await expect(list).toBeExisting();
 
     // Close panel
-    await browser.execute(() => {
+    await exec(() => {
       const backdrop = document.querySelector('.notification-center .backdrop');
       if (backdrop) (backdrop as HTMLElement).click();
     });
@@ -98,7 +99,7 @@ describe('Scenario D4 — Toast Notifications', () => {
 
   it('should close notification panel on Escape', async () => {
     // Open panel
-    await browser.execute(() => {
+    await exec(() => {
       const bell = document.querySelector('[data-testid="notification-bell"]');
       if (bell) (bell as HTMLElement).click();
     });
@@ -112,7 +113,7 @@ describe('Scenario D4 — Toast Notifications', () => {
     await browser.pause(400);
 
     // Panel should be gone
-    const panelAfter = await browser.execute(() => {
+    const panelAfter = await exec(() => {
       return document.querySelector('[data-testid="notification-panel"]') !== null;
     });
     expect(panelAfter).toBe(false);
@@ -152,7 +153,7 @@ describe('Scenario D5 — Error States', () => {
     await expect(center).toBeDisplayed();
 
     // Bell should be clickable without errors
-    await browser.execute(() => {
+    await exec(() => {
       const bell = document.querySelector('[data-testid="notification-bell"]');
       if (bell) (bell as HTMLElement).click();
     });
@@ -163,7 +164,7 @@ describe('Scenario D5 — Error States', () => {
     await expect(panel).toBeDisplayed();
 
     // Close
-    await browser.execute(() => {
+    await exec(() => {
       const backdrop = document.querySelector('.notification-center .backdrop');
       if (backdrop) (backdrop as HTMLElement).click();
     });
@@ -175,7 +176,7 @@ describe('Scenario D5 — Error States', () => {
     expect(boxes.length).toBeGreaterThanOrEqual(1);
 
     // Verify no project box has an error overlay or error class
-    const errorBoxes = await browser.execute(() => {
+    const errorBoxes = await exec(() => {
       const boxes = document.querySelectorAll('[data-testid="project-box"]');
       let errorCount = 0;
       for (const box of boxes) {