test(frontend): cover ContextMenuComponent template menu-item click bindings

[mengw15]

What changes were proposed in this PR?

Extends ContextMenuComponent's spec to cover the template's menu-item (click)
bindings. The class file is already at 100%, but the existing tests call the
handlers directly and never render/click the menu, so the template sat at ~54%.

13 added tests render the menu (setting the state each item's *ngIf needs),
query the <li nz-menu-item> by its label via By.css, fire
.triggerEventHandler("click", null), and assert the click reaches the handler
the item declares — either the component method (onCopy / onCut / onPaste /
onDelete / onClickExportHighlightedExecutionResult, spied) or the injected
OperatorMenuService double (disableHighlightedOperators,
viewResultHighlightedOperators, reuseResultHighlightedOperator,
executeUpToOperator). Covers both variants of the toggle items (disable/enable,
view/remove-view, reuse/remove-reusing) and both delete paths (operators vs
links-only).

This lifts context-menu.component.html from ~54% to 97.92%. The single
remaining line is the hardcoded-nzDisabled "reuse result" item's (click):
a disabled nz-menu-item genuinely swallows the click (verified — clicking it
does not invoke the handler), so rather than force an unrealistic interaction the
test only asserts that item renders; its handler is identical to
"remove reusing result", which is clicked and covered.

No production code was changed.

Any related issues, documentation, discussions?

Closes #7332

How was this PR tested?

Extended unit tests, run locally in frontend/:

ng test --watch=false --include src/app/workspace/component/workflow-editor/context-menu/context-menu/context-menu.component.spec.ts
# Test Files 1 passed (1) | Tests 42 passed (42)   — 3 consecutive runs, 0 flakes
# context-menu.component.html: ~54% -> 97.92%
prettier --write <spec>   # formatted
eslint  <spec>            # clean

The failure path was verified by deliberately breaking a new assertion and
confirming the suite exits non-zero.

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

Generated-by: Claude Code (Opus 4.8 [1M context])

[Copilot]

Pull request overview

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Adds unit tests that exercise ContextMenuComponent template (click) bindings by rendering the menu and triggering clicks on specific <li nz-menu-item> entries, improving template coverage without changing production code.

Changes:

• Introduced a clickItem(label) helper to find and click menu items by rendered text.
• Added 13 tests to verify each menu item routes to the correct component method or OperatorMenuService action.
• Added a render-only assertion for a hardcoded-disabled “reuse result” menu item.

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[github-actions]

Automated Reviewer Suggestions

Based on the git blame history of the changed files, we recommend the following reviewers:

• Contributors with relevant context: @eugenegujing
  You can notify them by mentioning @eugenegujing in a comment.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.44%. Comparing base (0f2cd49) to head (da83a06).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7335      +/-   ##
============================================
+ Coverage     83.36%   83.44%   +0.07%     
  Complexity     4128     4128              
============================================
  Files          1166     1166              
  Lines         46428    46428              
  Branches       5174     5174              
============================================
+ Hits          38705    38741      +36     
+ Misses         6003     5971      -32     
+ Partials       1720     1716       -4     

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.00% <ø> (ø)		Carriedforward from 0f2cd49
agent-service	83.65% <ø> (ø)		Carriedforward from 0f2cd49
amber	80.65% <ø> (ø)		Carriedforward from 0f2cd49
computing-unit-managing-service	43.60% <ø> (ø)		Carriedforward from 0f2cd49
config-service	65.97% <ø> (ø)		Carriedforward from 0f2cd49
file-service	69.05% <ø> (ø)		Carriedforward from 0f2cd49
frontend	84.20% <ø> (+0.17%)	⬆️
notebook-migration-service	78.89% <ø> (ø)		Carriedforward from 0f2cd49
pyamber	97.36% <ø> (ø)		Carriedforward from 0f2cd49
workflow-compiling-service	26.31% <ø> (ø)		Carriedforward from 0f2cd49

*This pull request uses carry forward flags. Click here to find out more.

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