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/features.test.ts

@@ -1,4 +1,5 @@
 import { browser, expect } from '@wdio/globals';
+import { exec } from '../helpers/execute.ts';
 
 /** Reset UI to home state (close any open panels/overlays). */
 async function resetToHomeState(): Promise<void> {
@@ -15,7 +16,7 @@ async function resetToHomeState(): Promise<void> {
 async function closeSettings(): Promise<void> {
   const panel = await browser.$('.sidebar-panel');
   if (await panel.isDisplayed().catch(() => false)) {
-    await browser.execute(() => {
+    await exec(() => {
       const btn = document.querySelector('.panel-close');
       if (btn) (btn as HTMLElement).click();
     });
@@ -29,14 +30,14 @@ async function openCommandPalette(): Promise<void> {
   await closeSettings();
 
   // Check if already open
-  const alreadyOpen = await browser.execute(() => {
+  const alreadyOpen = await exec(() => {
     const p = document.querySelector('.palette');
     return p !== null && getComputedStyle(p).display !== 'none';
   });
   if (alreadyOpen) return;
 
   // Dispatch Ctrl+K via JS for reliability with WebKit2GTK/tauri-driver
-  await browser.execute(() => {
+  await exec(() => {
     document.dispatchEvent(new KeyboardEvent('keydown', {
       key: 'k', code: 'KeyK', ctrlKey: true, bubbles: true, cancelable: true,
     }));
@@ -49,14 +50,14 @@ async function openCommandPalette(): Promise<void> {
 
 /** Close command palette if open — uses backdrop click (more reliable than Escape). */
 async function closeCommandPalette(): Promise<void> {
-  const isOpen = await browser.execute(() => {
+  const isOpen = await exec(() => {
     const p = document.querySelector('.palette');
     return p !== null && getComputedStyle(p).display !== 'none';
   });
   if (!isOpen) return;
 
   // Click backdrop to close (more reliable than dispatching Escape)
-  await browser.execute(() => {
+  await exec(() => {
     const backdrop = document.querySelector('.palette-backdrop');
     if (backdrop) (backdrop as HTMLElement).click();
   });
@@ -76,7 +77,7 @@ describe('BTerminal — Command Palette', () => {
 
     // Verify input accepts text (functional focus test, not activeElement check
     // which is unreliable in WebKit2GTK/tauri-driver)
-    const canType = await browser.execute(() => {
+    const canType = await exec(() => {
       const el = document.querySelector('.palette-input') as HTMLInputElement | null;
       if (!el) return false;
       el.focus();
@@ -142,7 +143,7 @@ describe('BTerminal — Command Palette', () => {
     const palette = await browser.$('.palette');
 
     // Click the backdrop (outside the palette)
-    await browser.execute(() => {
+    await exec(() => {
       const backdrop = document.querySelector('.palette-backdrop');
       if (backdrop) (backdrop as HTMLElement).click();
     });