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/llm-judged.test.ts

@@ -6,6 +6,7 @@
  */
 
 import { browser, expect } from '@wdio/globals';
+import { exec } from '../helpers/execute.ts';
 
 const API_KEY = process.env.ANTHROPIC_API_KEY;
 const SKIP = !API_KEY;
@@ -43,7 +44,7 @@ describe('LLM-judged UI quality', () => {
   it('should have complete settings panel', async function () {
     if (SKIP) return this.skip();
 
-    const html = await browser.execute(() => {
+    const html = await exec(() => {
       const panel = document.querySelector('.settings-drawer')
         ?? document.querySelector('.sidebar-panel');
       return panel?.innerHTML?.slice(0, 2000) ?? '';
@@ -58,7 +59,7 @@ describe('LLM-judged UI quality', () => {
   it('should have visually consistent theme', async function () {
     if (SKIP) return this.skip();
 
-    const vars = await browser.execute(() => {
+    const vars = await exec(() => {
       const s = getComputedStyle(document.documentElement);
       return {
         base: s.getPropertyValue('--ctp-base').trim(),
@@ -77,7 +78,7 @@ describe('LLM-judged UI quality', () => {
   it('should have proper error handling in UI', async function () {
     if (SKIP) return this.skip();
 
-    const toasts = await browser.execute(() => {
+    const toasts = await exec(() => {
       return document.querySelectorAll('.toast-error, .load-error').length;
     });
 
@@ -90,7 +91,7 @@ describe('LLM-judged UI quality', () => {
   it('should have readable text contrast', async function () {
     if (SKIP) return this.skip();
 
-    const colors = await browser.execute(() => {
+    const colors = await exec(() => {
       const body = getComputedStyle(document.body);
       return {
         bg: body.backgroundColor,
@@ -109,7 +110,7 @@ describe('LLM-judged UI quality', () => {
   it('should have well-structured project cards', async function () {
     if (SKIP) return this.skip();
 
-    const html = await browser.execute(() => {
+    const html = await exec(() => {
       const card = document.querySelector('.project-box') ?? document.querySelector('.project-card');
       return card?.innerHTML?.slice(0, 1500) ?? '';
     });
@@ -125,7 +126,7 @@ describe('LLM-judged UI quality', () => {
   it('should have consistent layout structure', async function () {
     if (SKIP) return this.skip();
 
-    const layout = await browser.execute(() => {
+    const layout = await exec(() => {
       const el = document.querySelector('.app-shell') ?? document.body;
       const children = Array.from(el.children).map(c => ({
         tag: c.tagName,
@@ -145,7 +146,7 @@ describe('LLM-judged UI quality', () => {
   it('should have accessible interactive elements', async function () {
     if (SKIP) return this.skip();
 
-    const stats = await browser.execute(() => {
+    const stats = await exec(() => {
       const buttons = document.querySelectorAll('button');
       const withLabel = Array.from(buttons).filter(b =>
         b.textContent?.trim() || b.getAttribute('aria-label') || b.getAttribute('title')
@@ -163,7 +164,7 @@ describe('LLM-judged UI quality', () => {
     if (SKIP) return this.skip();
 
     // Check console for errors (if available)
-    const errorCount = await browser.execute(() => {
+    const errorCount = await exec(() => {
       return document.querySelectorAll('.toast-error, .load-error, .error-boundary').length;
     });
 
@@ -173,7 +174,7 @@ describe('LLM-judged UI quality', () => {
   it('should have responsive grid layout', async function () {
     if (SKIP) return this.skip();
 
-    const grid = await browser.execute(() => {
+    const grid = await exec(() => {
       const el = document.querySelector('.project-grid');
       if (!el) return null;
       const rect = el.getBoundingClientRect();
@@ -188,7 +189,7 @@ describe('LLM-judged UI quality', () => {
   it('should have status bar with meaningful content', async function () {
     if (SKIP) return this.skip();
 
-    const content = await browser.execute(() => {
+    const content = await exec(() => {
       const bar = document.querySelector('[data-testid="status-bar"]')
         ?? document.querySelector('.status-bar');
       return bar?.textContent?.trim() ?? '';