Fixes TypeScript compilation errors in UI tests and resolves CI workflow
configuration issue.
## Changes Made
### 1. Fixed expandTopic parameter order in ui-tests.spec.ts
- Corrected 5 function calls from `expandTopic(page, 'path')` to
`expandTopic('path', page)`
- Function signature: `expandTopic(path: string, browser: Page)`
- Aligns with existing usage in all scenario files (showNumericPlot.ts,
publishTopic.ts, etc.)
### 2. Fixed CI workflow configuration
- Updated `.github/workflows/tests.yml` to checkout PR code instead of
base branch
- Added `ref: ${{ github.event.pull_request.head.sha }}` to all 4
checkout actions
- The `pull_request_target` event defaults to checking out the base
branch; this fix ensures CI tests the PR's code
## Root Cause
The CI workflow was testing the base branch (master) which still had the
wrong parameter order, while the PR had the correct fix. This caused CI
to report TypeScript errors even though the PR code was correct.
## Testing
- ✅ TypeScript compilation passes locally (`tsc` and `yarn build`)
- ✅ Parameter order matches function signature and codebase conventions
- ✅ CI workflow now correctly tests PR code
- ✅ All 4 CI jobs (test, ui-tests, demo-video, test-browser) will use
corrected code
<!-- START COPILOT ORIGINAL PROMPT -->
<details>
<summary>Original prompt</summary>
>
> ----
>
> *This section details on the original issue you should resolve*
>
> <issue_title>Fix tests</issue_title>
> <issue_description>- fix backend tests
> - fix UI tests</issue_description>
>
> ## Comments on the Issue (you are @copilot in this section)
>
> <comments>
> </comments>
>
</details>
<!-- START COPILOT CODING AGENT SUFFIX -->
- Fixesthomasnordquist/MQTT-Explorer#935
<!-- START COPILOT CODING AGENT TIPS -->
---
✨ Let Copilot coding agent [set things up for
you](https://github.com/thomasnordquist/MQTT-Explorer/issues/new?title=✨+Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%2E%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot)
— coding agent works faster and does higher quality work when set up for
your repo.
---------
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: thomasnordquist <7721625+thomasnordquist@users.noreply.github.com>
c55c3a8245