[GH] (texera/main): Workflow run "Direct Backport Push" is working again!

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The GitHub Actions job "Direct Backport Push" on texera.git/main has succeeded.
Run started by GitHub user github-merge-queue[bot] (triggered by github-merge-queue[bot]).

Head commit for run:
5021bc6f1a96d00cb26aa9c3a82c86fee67da0a9 / Xinyuan Lin <xi...@uci.edu>
test(frontend): click the toolbar buttons rather than calling their handlers (#7547)

### What changes were proposed in this PR?

The suite calls the handlers directly, which is not the same thing:
coverage for `(click)="onClickX()"` lands on the generated listener
body, so a button wired to the wrong handler — or to none — looks
perfectly tested today.

Adds 2 tests that click the real elements. The first is table-driven
over six visually near-identical icon buttons, since a copy-paste
leaving two of them on the same handler is the realistic defect. The
second asserts the converse: clicking auto-layout must not also reset
the panels.

**Verified by mutation**, all reverted (template diff empty):

| Mutation | Result |
|---|---|
| auto layout wired to reset panels | red |
| close panels wired to reset panels | red |
| generate report unwired | red |
| reset zoom wired to auto layout | red |
| add comment unwired | red |
| reset panels wired to close panels | red |

### Deliberately not included

The four display switches live in the `#executionSettings` popover,
which ng-zorro instantiates into a CDK overlay only on open. Opening the
first `NzPopoverDirective` on the page yields one switch, not four —
locating the right one needs more overlay plumbing than four lines
justify. They remain uncovered, and the issue records how to reach them.

No production file is touched.

### Any related issues, documentation, discussions?

Closes #7546

### How was this PR tested?

```
npx ng test --watch=false --include="**/menu.component.spec.ts"
```

```
 Test Files  1 passed (1)
      Tests  83 passed (83)
```

2 new on top of the existing 81. `yarn format:ci` passes.

### Was this PR authored or co-authored using generative AI tooling?

Generated-by: Claude Code (Opus 5)

Report URL: https://github.com/apache/texera/actions/runs/31567729510

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