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/search.test.ts

@@ -5,12 +5,13 @@
 import { browser, expect } from '@wdio/globals';
 import * as S from '../helpers/selectors.ts';
 import { openSearch, closeSearch } from '../helpers/actions.ts';
+import { exec } from '../helpers/execute.ts';
 
 describe('Search overlay', () => {
   it('should open via Ctrl+Shift+F', async () => {
     await openSearch();
 
-    const visible = await browser.execute((sel: string) => {
+    const visible = await exec((sel: string) => {
       const el = document.querySelector(sel);
       if (!el) return false;
       return getComputedStyle(el).display !== 'none';
@@ -21,7 +22,7 @@ describe('Search overlay', () => {
   });
 
   it('should focus the search input on open', async () => {
-    const focused = await browser.execute((sel: string) => {
+    const focused = await exec((sel: string) => {
       return document.activeElement?.matches(sel) ?? false;
     }, S.SEARCH_INPUT);
     if (focused) {
@@ -50,7 +51,7 @@ describe('Search overlay', () => {
   });
 
   it('should show Esc hint badge', async () => {
-    const text = await browser.execute((sel: string) => {
+    const text = await exec((sel: string) => {
       const el = document.querySelector(sel);
       return el?.textContent ?? '';
     }, S.ESC_HINT);
@@ -77,7 +78,7 @@ describe('Search overlay', () => {
 
     await input.setValue('test');
     // Results should not appear instantly
-    const immediateCount = await browser.execute(() => {
+    const immediateCount = await exec(() => {
       return document.querySelectorAll('.result-item').length;
     });
     expect(typeof immediateCount).toBe('number');
@@ -86,7 +87,7 @@ describe('Search overlay', () => {
   it('should close on Escape key', async () => {
     await closeSearch();
 
-    const hidden = await browser.execute((sel: string) => {
+    const hidden = await exec((sel: string) => {
       const el = document.querySelector(sel);
       if (!el) return true;
       return getComputedStyle(el).display === 'none';
@@ -98,7 +99,7 @@ describe('Search overlay', () => {
     await openSearch();
     await browser.pause(300);
 
-    const visible = await browser.execute(() => {
+    const visible = await exec(() => {
       // Search overlay uses class="search-backdrop" or "overlay-backdrop"
       const el = document.querySelector('.overlay-backdrop')
         ?? document.querySelector('.search-backdrop');
@@ -117,7 +118,7 @@ describe('Search overlay', () => {
     await openSearch();
     const input = await browser.$(S.SEARCH_INPUT);
     if (await input.isExisting()) {
-      const value = await browser.execute((sel: string) => {
+      const value = await exec((sel: string) => {
         const el = document.querySelector(sel) as HTMLInputElement;
         return el?.value ?? '';
       }, S.SEARCH_INPUT);
@@ -128,7 +129,7 @@ describe('Search overlay', () => {
 
   it('should have proper overlay positioning', async () => {
     await openSearch();
-    const dims = await browser.execute((sel: string) => {
+    const dims = await exec((sel: string) => {
       const el = document.querySelector(sel);
       if (!el) return null;
       const rect = el.getBoundingClientRect();