Fix tailwind build + test-DB isolation

- app.css: CSS quote chars in .clu-quote-text::before/::after were
  literal smart quotes which broke as terminating string delimiters in
  the tailwind v4 parser. Use unicode escapes \201E and \201C.
- tests/TestCase.php: force DB_CONNECTION=sqlite + :memory: in setUp.
  phpunit.xml env section was being ignored by pest 3 runner, so
  RefreshDatabase truncated the real MySQL between turns.
- .env.testing for clarity (sqlite memory).

app/.env.testing

@@ -0,0 +1,25 @@
+APP_NAME=CluPilot
+APP_ENV=testing
+APP_KEY=base64:oEEC4rofMfGShU0P7spAjI7HM/064V1ku3Ob42HtIhE=
+APP_DEBUG=true
+APP_URL=http://localhost
+
+BCRYPT_ROUNDS=4
+
+DB_CONNECTION=sqlite
+DB_DATABASE=:memory:
+
+CACHE_STORE=array
+SESSION_DRIVER=array
+QUEUE_CONNECTION=sync
+MAIL_MAILER=array
+BROADCAST_CONNECTION=null
+
+LOG_CHANNEL=stack
+LOG_LEVEL=warning
+
+REVERB_APP_ID=clupilot
+REVERB_APP_KEY=test
+REVERB_APP_SECRET=test
+REVERB_HOST=127.0.0.1
+REVERB_PORT=8080

app/resources/css/app.css

@@ -588,8 +588,8 @@
     box-shadow: inset 0 1px 0 rgba(255,255,255,0.8);
   }
   .clu-quote-text { font-size: 13.5px; color: var(--color-fg); line-height: 1.55; }
-  .clu-quote-text::before { content: "„"; color: var(--color-accent); font-size: 24px; line-height: 0; margin-right: 4px; vertical-align: -6px; font-weight: 600; }
+  .clu-quote-text::before { content: "\201E"; color: var(--color-accent); font-size: 24px; line-height: 0; margin-right: 4px; vertical-align: -6px; font-weight: 600; }
-  .clu-quote-text::after  { content: """; color: var(--color-accent); font-weight: 600; }
+  .clu-quote-text::after  { content: "\201C"; color: var(--color-accent); font-weight: 600; }
   .clu-quote-author { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
   .clu-avatar {
     width: 32px; height: 32px;

app/tests/TestCase.php

@@ -6,5 +6,29 @@ use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
 
 abstract class TestCase extends BaseTestCase
 {
-    //
+    protected function setUp(): void
+    {
+        // HARD override: never let tests touch the dev MySQL — even if
+        // phpunit.xml env section is ignored by the runner.
+        putenv('DB_CONNECTION=sqlite');
+        putenv('DB_DATABASE=:memory:');
+        $_ENV['DB_CONNECTION']    = 'sqlite';
+        $_ENV['DB_DATABASE']      = ':memory:';
+        $_SERVER['DB_CONNECTION'] = 'sqlite';
+        $_SERVER['DB_DATABASE']   = ':memory:';
+
+        parent::setUp();
+
+        // Belt-and-braces: force the resolved config to sqlite memory.
+        config([
+            'database.default'             => 'sqlite',
+            'database.connections.sqlite'  => [
+                'driver'                  => 'sqlite',
+                'url'                     => null,
+                'database'                => ':memory:',
+                'prefix'                  => '',
+                'foreign_key_constraints' => true,
+            ],
+        ]);
+    }
 }