fix: move Chromium-specific launch args out of root use block, fix CTA text match

- launchOptions with --disable-dev-shm-usage and --no-sandbox are
  Chromium-specific; passing them to Firefox/WebKit causes errors.
  Move to chromium and android project use blocks only.
- Fix landing page CTA assertion to match actual button text
  ("Get $KRK", "Get Your Edge") instead of generic patterns.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

playwright.config.ts

@@ -12,6 +12,9 @@ import { defineConfig, devices } from '@playwright/test';
 // Read-only specs safe to run in every browser/viewport after chain state exists.
 const CROSS_BROWSER_SPECS = '0[367]-*.spec.ts';
 
+// Chromium-specific launch flags (not valid for Firefox/WebKit).
+const CHROMIUM_ARGS = ['--disable-dev-shm-usage', '--no-sandbox'];
+
 export default defineConfig({
   testDir: './tests/e2e',
   testMatch: process.env.CI ? '[0-9]*.spec.ts' : '**/*.spec.ts',
@@ -25,9 +28,6 @@ export default defineConfig({
   use: {
     headless: true,
     actionTimeout: 0,
-    launchOptions: {
-      args: ['--disable-dev-shm-usage', '--no-sandbox'],
-    },
   },
   projects: [
     /* ── Desktop browsers ─────────────────────────────────── */
@@ -37,6 +37,7 @@ export default defineConfig({
         ...devices['Desktop Chrome'],
         viewport: { width: 1280, height: 720 },
         screen: { width: 1280, height: 720 },
+        launchOptions: { args: CHROMIUM_ARGS },
       },
     },
     {
@@ -73,6 +74,7 @@ export default defineConfig({
       name: 'android',
       use: {
         ...devices['Pixel 7'],
+        launchOptions: { args: CHROMIUM_ARGS },
       },
       dependencies: ['chromium'],
       testMatch: CROSS_BROWSER_SPECS,