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/workspace.test.ts

@@ -6,6 +6,7 @@
  */
 
 import { browser, expect } from '@wdio/globals';
+import { exec } from '../helpers/execute.ts';
 
 describe('BTerminal — Workspace & Projects', () => {
   it('should display the project grid', async () => {
@@ -45,7 +46,7 @@ describe('BTerminal — Workspace & Projects', () => {
 
   it('should switch project tabs', async () => {
     // Use JS click — WebDriver clicks don't always trigger Svelte onclick
-    const switched = await browser.execute(() => {
+    const switched = await exec(() => {
       const box = document.querySelector('.project-box') ?? document.querySelector('.project-card');
       if (!box) return false;
       const tabs = box.querySelectorAll('.ptab, .project-tab, .tab-btn');
@@ -62,7 +63,7 @@ describe('BTerminal — Workspace & Projects', () => {
     expect(text.toLowerCase()).toContain('docs');
 
     // Switch back to Model tab
-    await browser.execute(() => {
+    await exec(() => {
       const box = document.querySelector('.project-box') ?? document.querySelector('.project-card');
       const tab = box?.querySelector('.ptab, .project-tab, .tab-btn');
       if (tab) (tab as HTMLElement).click();