Cover the console frame's controls and the preset service's guards

[aglinxinyuan]

Task Summary

Two small frontend targets, both live and both partly untested:

File	Coverage
workspace/service/preset/preset.service.ts	91.7% lines, 6 missed + 4 partial
workspace/component/result-panel/console-frame/console-frame.component.html	93.5% lines, 6 missed — and 0 of 8 branches, 5 of 9 functions

The template's branch and function figures are the real gap; its line percentage hides it.

Worth establishing before writing anything, because both guesses turn out to be wrong in instructive ways:

• preset.service.ts is live, not another workflow-snapshot.service.ts. It is injected by preset-wrapper.component.ts and operator-property-edit-frame.component.ts, and its user/config endpoint is served by UserConfigResource.scala.
• The template is NOT an Template coverage does not register for components whose spec calls TestBed.overrideComponent #7458 case. The existing spec uses imports: [ConsoleFrameComponent, ...] with no overrideComponent, and the coverage map proves bindings execute counted — the *ngFor statement shows 124 hits. This is a partly-untested template, not a lost source map, so the remedy is to extend the existing TestBed rather than append a fresh one.

Traps here:

1. The settings dropdown's menu is projected into a CDK overlay wired in ngAfterViewInit behind an auditTime(150). The fixture must be created inside fakeAsync — created in a plain beforeEach, the timers escape tick() and the overlay never attaches, so a test asserting on its contents finds zero elements and can be written to "pass" vacuously.
2. Toggling two switches off at once hides a swap. Asserting timestamp and source independently is what makes an exchange of their [(ngModel)] bindings detectable.
3. Four uncovered items are unreachable and should be left alone — see below; two of them are production defects, and a test would cement them.

Task Type

• Refactor / Cleanup
• DevOps / Deployment / CI
• Testing / QA
• Documentation
• Performance
• Other