test(e2e): scaffold WebdriverIO + tauri-driver E2E testing infrastructure

v2/tests/e2e/specs/smoke.test.ts

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+import { browser, expect } from '@wdio/globals';
+
+describe('BTerminal — Smoke Tests', () => {
+  it('should render the application window', async () => {
+    const title = await browser.getTitle();
+    expect(title).toBe('BTerminal');
+  });
+
+  it('should display the status bar', async () => {
+    const statusBar = await browser.$('.status-bar');
+    await expect(statusBar).toBeDisplayed();
+  });
+
+  it('should show version text in status bar', async () => {
+    const version = await browser.$('.status-bar .version');
+    await expect(version).toBeDisplayed();
+    const text = await version.getText();
+    expect(text).toContain('BTerminal');
+  });
+
+  it('should display the sidebar rail', async () => {
+    const sidebarRail = await browser.$('.sidebar-rail');
+    await expect(sidebarRail).toBeDisplayed();
+  });
+
+  it('should display the workspace area', async () => {
+    const workspace = await browser.$('.workspace');
+    await expect(workspace).toBeDisplayed();
+  });
+
+  it('should toggle sidebar with settings button', async () => {
+    const settingsBtn = await browser.$('.rail-btn');
+    await settingsBtn.click();
+
+    const sidebarPanel = await browser.$('.sidebar-panel');
+    await expect(sidebarPanel).toBeDisplayed();
+
+    // Click again to close
+    await settingsBtn.click();
+    await expect(sidebarPanel).not.toBeDisplayed();
+  });
+});