workflows/app.yml: Verify binaries that are built in CI run in CI too

[illume]

Summary

Verifies the built app binaries run in CI (Mac, Linux, Windows).

Just basic checks for now, one artifact for each platform. Check the file is there, opens, runs backend, runs app.

Changes

• app/scripts: Add verify-build-windows.ps1 script
• app/scripts: Add verify-build-mac.sh for verifying mac builds
• app/scripts: Add verify-build-linux.sh for verifying linux builds
• package.json: app/package.json: Add verify-build-* scripts
• .github/workflows/app.yml: Verify app builds in CI
• app/README.md: docs/development: Document verify builds

Screenshots

In each app build CI job:

Mac

Windows

Linux

Steps to Test

Mainly the tests are useful in CI, to make sure we're generating binaries that run:

• The tests run in CI, to verify app builds are built and run. Check app jobs that verification of running is successful.

Manual testing.

1. Package the desktop app: npm run app:package (creates packaged artifacts in app/dist/)
2. Run verification from repository root:
   • Linux: npm run app:verify-build-linux
   • Windows: npm run app:verify-build-windows
   • Mac: npm run app:verify-build-mac
3. Verify console output shows artifact checks, backend version validation, and app execution tests
4. Confirm all verifications pass with [PASS] or ✓ markers

[k8s-ci-robot]

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[Copilot]

Pull request overview

Adds a lightweight “verify built binaries run” smoke test for the Electron app across Linux/macOS/Windows, and wires it into CI so packaging regressions are caught early.

Changes:

• Introduces platform-specific build verification scripts under app/scripts/ (Linux/macOS shell scripts, Windows PowerShell).
• Exposes those scripts via new verify-build-* npm scripts (both at app/ level and repo root convenience wrappers).
• Updates the GitHub Actions app workflow to run verification after packaging, and documents usage in developer docs.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
package.json	Adds root-level wrappers to run app build verification scripts from repo root.
app/package.json	Adds verify-build-{linux,mac,windows} scripts that invoke the new verifier scripts.
app/scripts/verify-build-linux.sh	Verifies Linux artifacts exist, extracts tarball, checks backend --version, runs list-plugins.
app/scripts/verify-build-mac.sh	Verifies DMG/app bundle, checks backend --version, runs list-plugins with a timeout tolerant of CI headless hangs.
app/scripts/verify-build-windows.ps1	Verifies .exe installer, checks backend --version, runs Headlamp.exe list-plugins.
.github/workflows/app.yml	Runs the new verification steps after each platform build job.
docs/development/index.md	Documents the new verification commands and expected behavior (esp. macOS timeout note).
app/README.md	Documents the new app-level verification scripts and what they check.

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[illume]

Rebased against main to fix git conflict.