Fix 3 nicht funktionierende Alert-Dismiss-Buttons (M34)

README-Milestone-Nachcheck (Port-Konflikt-Prüfung/"Fertig"-Button)
deckte drei eigenständige Bugs derselben Klasse auf: Cancel/OK-Buttons
bei ReviewApplyViews Apply-Fehler-Alert, ConnectViews
Zertifikat-Alert und ConnectViews SSH-Hostkey-Alert taten nichts oder
zu wenig - der jeweilige Verbindungs-/Fehlerzustand blieb hängen,
der Dialog konnte nicht sauber verlassen werden.

Neue ConnectionService.cancelPendingTrustConfirmation() und
SetupViewModel.dismissApplyError(), alle drei Alerts korrekt
verdrahtet (Button-Action + Bindings-Setter fuer Tap-Outside/Esc).
Totes dismissPendingSSHTrust() entfernt. 1 neuer Regressionstest,
alle 102 Unit-Tests gruen.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

RouterOSAssistantTests/ConnectionServiceTests.swift

@@ -70,6 +70,25 @@ final class ConnectionServiceTests: XCTestCase {
         XCTAssertEqual(service.state, .needsCertificateConfirmation(fingerprint: "AA:BB"))
     }
 
+    /// Regression test for the README milestone re-check, 2026-09-17: `ConnectView`'s
+    /// "Abbrechen" button on the certificate-trust alert previously had an empty action and could
+    /// never actually clear `state` back out of `.needsCertificateConfirmation`, so the alert
+    /// (whose `isPresented` binding is derived from `state`) could never really be dismissed.
+    func testCancelPendingTrustConfirmationResetsCertificateConfirmationToIdle() async {
+        let service = ConnectionService()
+
+        await service.connect(
+            with: credentials,
+            makeRestTransport: { MockTransport(kind: .rest, connectError: RouterOSError.untrustedCertificate(fingerprint: "AA:BB")) },
+            makeSSHTransport: { MockTransport(kind: .ssh) }
+        )
+        XCTAssertEqual(service.state, .needsCertificateConfirmation(fingerprint: "AA:BB"))
+
+        service.cancelPendingTrustConfirmation()
+
+        XCTAssertEqual(service.state, .idle)
+    }
+
     func testFailsWhenBothTransportsFail() async {
         let service = ConnectionService()