Let the on-device chain test skip when there is no Portal

The QUIC cases built their node inside runCatching, so with no Portal
the assumption failure that should have skipped them was caught as an
ordinary throwable: one case failed asserting on it, which is what
turned CI's device job red, and the other passed having tested
nothing. The node is now built before runCatching.

Reproduced and verified with CI's own command on API 31 and API 35
emulators with no Portal: 57 tests, none failing, 33 skipped.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: AlbertoDeckow

app/src/androidTest/kotlin/eu/nodepass/somewhere/quic/ChainVerificationOnDeviceTest.kt

@@ -31,6 +31,8 @@ import org.junit.runner.RunWith
  */
 @RunWith(AndroidJUnit4::class)
 class ChainVerificationOnDeviceTest {
+    // Built outside any runCatching: with no Portal, node() skips the test by
+    // throwing an assumption failure, which runCatching would otherwise swallow.
     private fun byName(net: String) =
         E2eEnvironment.node(net = net).let { it.copy(certificateVerification = CertificateVerification.Sni(it.host)) }
 
@@ -43,17 +45,18 @@ class ChainVerificationOnDeviceTest {
 
     @Test
     fun aGeneratedCertificateIsRefusedOverQuic() {
-        val failure =
-            runCatching { E2eEnvironment.openQuic(byName("udp")).use { it.completeHandshake() } }.exceptionOrNull()
+        val node = byName("udp")
+        val failure = runCatching { E2eEnvironment.openQuic(node).use { it.completeHandshake() } }.exceptionOrNull()
         assertTrue("expected a QUIC failure, got $failure", failure is QuicException)
         val reason = (failure as QuicException).failure
         assertTrue("expected a trust refusal, got ${reason.detail}", reason is QuicFailure.Untrusted)
     }
 
     @Test
     fun aRefusedConnectionIsNotLeftOpen() {
+        val node = byName("udp")
         val before = QuicConnection.liveConnections()
-        runCatching { E2eEnvironment.openQuic(byName("udp")).use { it.completeHandshake() } }
+        runCatching { E2eEnvironment.openQuic(node).use { it.completeHandshake() } }
         assertEquals(before, QuicConnection.liveConnections())
     }
 }