feat(frontend): add admin computing unit terminate button

[kunwp1]

What changes were proposed in this PR?

Problem. An admin can list every computing unit on Admin > Computing Units (#8888) but cannot act on one. Freeing a stuck or idle unit on a full Kubernetes cluster still means finding its pod and deleting it with kubectl. The backend already lets an ADMIN terminate any unit (DELETE /computing-unit/{cuid}/terminate, #7337), so only the UI is missing.

Fix. Adds a delete-icon button to every row, in a new Actions column. It calls ComputingUnitActionsService.confirmAndTerminate, the confirmation the user's own Computing Units page already uses, so the dialog follows the unit type: a "results will be lost" warning for a Kubernetes unit and "Disconnect" for a local one. Cancelling the dialog or a failed request leaves the row alone. confirmAndTerminate gains an optional onTerminated callback that runs only after a successful termination, and the page uses it to drop the row at once instead of showing the unit as Running until the next 5 second poll.

Two details follow from an admin seeing other users' units. A poll that started before the DELETE can answer after it with the unit still listed, so the page remembers the units it terminated and filters them out of every poll response. And ng-zorro renders the dialog and toast text through [innerHTML] while any user can rename their unit, so confirmAndTerminate now HTML-escapes the unit name for every caller.

Before:  admin finds a stuck unit on the page -> finds its pod -> kubectl delete pod
After:   admin finds a stuck unit on the page -> clicks its delete icon -> confirms -> row disappears

Not included. Telling the owner their unit was terminated (#6483) and the cluster capacity panels (#6481, #6482) are separate issues. There is no backend change.

Any related issues, documentation, discussions?

Closes #6480. Part of #6476.

Follows #8888, which added the page.

How was this PR tested?

Tests were added for the button, the hand-off to the dialog and the name escaping. They cover a button on every row (Kubernetes and local), the click confirming the clicked row's unit, the row leaving only after a successful termination and staying on cancel or failure, a stale in-flight poll not bringing the row back, the detail row's colspan, a unit name holding markup in the dialog and the toast, and onTerminated firing on success only. The tests were written first and watched fail, and breaking the code on purpose (name left unescaped, callback on every outcome, row dropped on click, poll responses left unfiltered) fails exactly the seven tests meant to catch it.

cd frontend && npx ng test --watch=false --include='**/admin-computing-unit.component.spec.ts' --include='**/computing-unit-actions.service.spec.ts'
cd frontend && npx ng test --watch=false

The first command passes 53 tests and the second passes 6,622 (1 skipped). ngc -p src/tsconfig.app.json --noEmit, prettier-eslint and eslint ran clean on the changed files.

Screen.Recording.2026-10-10.at.4.30.51.PM.mov

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[kunwp1]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.61%. Comparing base (53114a7) to head (8453cae).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8947   +/-   ##
=========================================
  Coverage     92.61%   92.61%           
  Complexity     5060     5060           
=========================================
  Files          1257     1257           
  Lines         53762    53783   +21     
  Branches       6705     6705           
=========================================
+ Hits          49789    49809   +20     
  Misses         2316     2316           
- Partials       1657     1658    +1     

Flag	Coverage Δ		*Carryforward flag
access-control-service	77.38% <ø> (ø)		Carriedforward from 53114a7
agent-service	99.16% <ø> (ø)		Carriedforward from 53114a7
amber	88.10% <ø> (ø)		Carriedforward from 53114a7
computing-unit-managing-service	60.48% <ø> (ø)		Carriedforward from 53114a7
config-service	87.37% <ø> (ø)		Carriedforward from 53114a7
file-service	81.95% <ø> (ø)		Carriedforward from 53114a7
frontend	96.58% <100.00%> (-0.01%)	⬇️
notebook-migration-service	83.73% <ø> (ø)		Carriedforward from 53114a7
pyamber	98.52% <ø> (ø)		Carriedforward from 53114a7
workflow-compiling-service	74.09% <ø> (ø)		Carriedforward from 53114a7

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