xuang7 opened a new issue, #7523:
URL: https://github.com/apache/texera/issues/7523
### Feature Summary
Step 5 of the operator-demo video generator: add a controller that runs the
workflow and opens the result panel, so the demo ends on the output a user can
expect.
### Proposed Solution or Design
Add a new ExecutionControllerBuilder to the Playwright layer. It enables
result viewing on the operator, runs the workflow, waits for the run to finish,
and opens the result panel.
```
new ExecutionControllerBuilder(ctx)
.enableViewResult()
.runWorkflowAndWait()
.openResultPanel()
.execute()
```
The controller handles:
- Starting the run: waits until the Run button is usable, optionally creates
or selects a computing unit, and uses a brief press-and-hold when triggering
the run.
- Waiting for completion: first waits for the run to leave the idle state,
then waits for execution to finish with a hard timeout on failure.
- Validating results: opens the result panel and verifies that it contains
valid output rather than an empty result or error state.
Frontend hooks: None expected: the Run button already has a stable id.
### Affected Area
_No response_
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