WebApp re-triggers a duplicate full workflow run after Human Input resume, causing 'Stopped by user'

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### Dify version

1.16.0

### Cloud or Self Hosted

Self Hosted (Docker)

### Steps to reproduce

### Self Checks
- [x] I have searched for existing issues, including closed ones.
- [x] I confirm that I am using English to submit this report.
- [x] Please do not modify this template :) and fill in all the required fields.

### Dify version
1.16.0

### Cloud or Self Hosted
Self Hosted (Docker Compose)

### Steps to reproduce
1. Create a Workflow app with: Start (one text-input variable `test`) → Human Input node (webapp delivery, `form_content: '{{#start.test#}}'`, single action button `action_1`) → Template Transform node (`template: '{{ rendered }}'`, referencing the Human Input node's `__rendered_content` output) → End.
2. Publish the app.
3. Open the published WebApp, fill in the `test` input, run the workflow.
4. When the workflow pauses at the Human Input node and the form is displayed, click the action button once.

### Worker log evidence

The first execution (`workflow_run_id=5eea261a-ba8f-4b9e-947a-3ea0b52094a2`) pauses, receives the button click, and resumes/completes successfully:

09:01:36.437 workflow_based_app_execution_task received (workflow_run_id='5eea261a-ba8f-4b9e-947a-3ea0b52094a2', invoke_from=WEB_APP)
09:01:36.493 Created workflow pause 019fa7f5-436d-7799-b310-903d03e26d94 for workflow run 5eea261a-ba8f-4b9e-947a-3ea0b52094a2
09:01:41.348 Task resume_app_execution received <-- user clicked the action button
09:01:41.360 Resumed workflow pause 019fa7f5-436d-7799-b310-903d03e26d94 for workflow run 5eea261a-ba8f-4b9e-947a-3ea0b52094a2
09:01:41.372 Deleted workflow pause 019fa7f5-436d-7799-b310-903d03e26d94 for workflow run 5eea261a-ba8f-4b9e-947a-3ea0b52094a2
09:01:41.380 Task resume_app_execution succeeded
09:01:41.442 HTTP Request: POST http://sandbox:8194/v1/sandbox/run "HTTP/1.1 200 OK" <-- Template Transform node ran fine

### ✔️ Expected Behavior

The workflow resumes from the Human Input node, runs the Template Transform node, and the End node outputs the rendered form content. The UI should show a successful result.

### ❌ Actual Behavior

The UI shows a red error banner: `Stopped by user.` on the workflow, and the Human Input node shows a warning icon, even though (per the `worker` logs) the workflow actually resumed and completed successfully the first time.

[test.yml](https://github.com/user-attachments/files/30455498/test.yml)

Reproduce the published WebApp workflow from the issue steps using test.yml, then trace the Human Input action through the named resume_app_execution task and the worker log sequence. Compare the successful resumed workflow with the UI's stopped state and duplicate run; done means one click produces one completed run and a successful UI result.

Written by the indexing model from the issue text.