fix: use electron browser in cypress [release-4.21]

[ronlavi2412]

Summary

• Change cypress run --browser chrome → cypress run --browser electron in package.json (developer consistency fix)

Why CI is not broken on this branch

On release-4.21, test-prow-e2e.sh calls npm run test-cypress-headless — not yarn run cypress. The test-cypress-headless script already defaults to electron:

node ... cypress run --env openshift=true --browser ${BRIDGE_E2E_BROWSER_NAME:=electron}

So the CI pipeline on this branch is not affected by the Chrome absence in tectonic-console-builder-v29.

Why this PR is still useful

The cypress script (used for local development: yarn/npm run cypress) still hardcodes --browser chrome, which will fail on any machine without Chrome. This PR makes the local developer experience consistent with what CI actually runs.

Companion PRs

CI builder standardization (openshift/release): openshift/release#82053

This series (all branches):

Branch	PR	Role
release-4.19	#263	Urgent — fixes active CI failure
release-4.21	#264	Consistency — CI already uses electron
release-4.22	#265	Consistency — CI already uses electron
main	#266	Consistency — CI already uses electron
release-4.20	#267	Prerequisite — must merge before openshift/release#82053
release-4.18	#268	Prerequisite — must merge before openshift/release#82053
release-4.17	#269	Prerequisite — must merge before openshift/release#82053

Test plan

• npm run cypress launches Cypress under Electron locally

🤖 Generated with Claude Code

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ronlavi2412

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[Parthivk100]

/lgtm