feat(python-notebook-migration, frontend): add an AI generate workflow entry point on the dashboard

[zyratlo]

What changes were proposed in this PR?

Adds a second entry point for the Python notebook to Texera workflow migration tool. Until now the only way to start a conversion was the "AI generate workflow" button in the workspace toolbar, which requires a workflow already open on the canvas. This PR adds an equivalent button on the workflow dashboard so a user can start the flow without opening a workflow first. It reuses the existing import modal (#7314) and the existing generation pipeline (#5273) rather than duplicating them.

Dashboard button (user-workflow.component.{ts,html})

• A new icon button in the workflows toolbar
• openAiGenerateModal() opens the same NotebookImportModalComponent used by the canvas menu
• startAiGeneratedWorkflow(file, model) validates the .ipynb extension, creates a new empty workflow, records the selected file and model for the workspace to pick up, and navigates to the new workflow.

Handoff and workspace trigger (notebook-migration.service.ts, menu.component.ts)

• The dashboard has no canvas to run the generation on, so generation is deferred to the workspace. NotebookMigrationService gains a one time handoff slot (setPendingGeneration / consumePendingGeneration) keyed by the new workflow's wid.
• The workspace menu consumes the slot in its existing workflow modifiable subscription: once the freshly created workflow is loaded and editable, it runs the same onClickImportNotebook(file, model) pipeline the toolbar button uses

Import modal (notebook-import-modal.component.{ts,html})

• The "generating overwrites your current workflow" warning is specific to the canvas flow, where a workflow is already open. NotebookImportModalData gains an optional showOverwriteWarning flag. It defaults to shown when unset (canvas behavior unchanged) and the dashboard sets it false, since the dashboard always creates a new workflow and has nothing to overwrite.

Behavior note

• The dashboard creates the new workflow before generation runs, because a wid is required to open the workspace (routing only exposes workflow/:id). If generation then fails, an empty "Untitled workflow" remains saved, which differs from the canvas flow where an already open workflow is overwritten.

Demo

pr11.demo.mov

Note: a mock LLM API was used in this demo so that we don't need to wait for real-time generation. This does not affect any functionality for this PR.

Any related issues, documentation, discussions?

Closes #7360
Parent issue #4301

How was this PR tested?

Added unit specs:

• notebook-migration.service.spec.ts
• menu.component.spec.ts
• notebook-import-modal.component.spec.ts
• user-workflow.component.spec.ts

Was this PR authored or co-authored using generative AI tooling?

Generated-by: Claude Code (Claude Opus 4.8)

[github-actions]

Automated Reviewer Suggestions

Based on the git blame history of the changed files, we recommend the following reviewers:

• Contributors with relevant context: @Ma77Ball, @mengw15, @aglinxinyuan
  You can notify them by mentioning @Ma77Ball, @mengw15, @aglinxinyuan in a comment.

[zyratlo]

/request-review @mengw15

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.64%. Comparing base (8aec229) to head (4d5db07).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7392      +/-   ##
============================================
- Coverage     86.73%   86.64%   -0.10%     
+ Complexity     4218     4209       -9     
============================================
  Files          1169     1169              
  Lines         46754    46842      +88     
  Branches       5203     5230      +27     
============================================
+ Hits          40553    40587      +34     
- Misses         4489     4536      +47     
- Partials       1712     1719       +7     

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.00% <ø> (ø)		Carriedforward from b6157b9
agent-service	89.01% <ø> (ø)		Carriedforward from b6157b9
amber	81.85% <ø> (+0.01%)	⬆️	Carriedforward from b6157b9
computing-unit-managing-service	50.72% <ø> (-9.67%)	⬇️	Carriedforward from b6157b9
config-service	65.97% <ø> (ø)		Carriedforward from b6157b9
file-service	69.05% <ø> (ø)		Carriedforward from b6157b9
frontend	89.50% <100.00%> (-0.04%)	⬇️
notebook-migration-service	78.89% <ø> (ø)		Carriedforward from b6157b9
pyamber	97.56% <ø> (ø)		Carriedforward from b6157b9
workflow-compiling-service	26.31% <ø> (ø)		Carriedforward from b6157b9

*This pull request uses carry forward flags. Click here to find out more.

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[Copilot]

Pull request overview

Adds a second UI entry point for the Python-notebook → workflow migration flow by enabling “AI generate workflow” from the workflow dashboard, then deferring execution to the workspace once the newly created workflow loads.

Changes:

• Adds a dashboard toolbar button that opens the existing notebook import modal and creates a new empty workflow before navigating to the workspace.
• Implements a one-time handoff mechanism in NotebookMigrationService so the dashboard can pass (file, model, wid) to the workspace menu for deferred execution.
• Updates the import modal to optionally hide the “overwrite current workflow” warning for the dashboard flow, and adds unit tests covering the new behaviors.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
frontend/src/app/workspace/service/notebook-migration/notebook-migration.service.ts	Adds a pending-generation handoff slot keyed by wid for dashboard→workspace deferred execution.
frontend/src/app/workspace/service/notebook-migration/notebook-migration.service.spec.ts	Adds unit tests for the pending-generation consume/clear behavior.
frontend/src/app/workspace/component/notebook-import-modal/notebook-import-modal.component.ts	Adds showOverwriteWarning option (default-on) to support dashboard flow hiding the warning.
frontend/src/app/workspace/component/notebook-import-modal/notebook-import-modal.component.html	Conditionally renders the overwrite warning based on showOverwriteWarning.
frontend/src/app/workspace/component/notebook-import-modal/notebook-import-modal.component.spec.ts	Adds coverage ensuring the overwrite warning can be hidden via modal data.
frontend/src/app/workspace/component/menu/menu.component.ts	Consumes the pending-generation handoff once the loaded workflow becomes modifiable.
frontend/src/app/workspace/component/menu/menu.component.spec.ts	Adds tests ensuring the deferred trigger calls onClickImportNotebook only for matching wid/modifiable state.
frontend/src/app/dashboard/component/user/user-workflow/user-workflow.component.ts	Adds dashboard entry point: opens modal, validates .ipynb, creates empty workflow, stashes handoff, navigates to workspace.
frontend/src/app/dashboard/component/user/user-workflow/user-workflow.component.html	Adds the dashboard toolbar icon button gated by feature flag and access level.
frontend/src/app/dashboard/component/user/user-workflow/user-workflow.component.spec.ts	Adds unit tests for dashboard modal opening, validation, workflow creation/project add, and handoff+navigation behavior.

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[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated no new comments.

Suppressed comments (1)

frontend/src/app/dashboard/component/user/user-workflow/user-workflow.component.ts:392

• Router.navigate resolves to false when navigation is cancelled, but this callback always returns true. The modal then closes while the newly set handoff remains pending, so it may unexpectedly run if this workflow is opened later. Handle both a false result and rejection, clear the handoff, and report that opening the workflow failed.

        return this.router.navigate([USER_WORKSPACE, wid]).then(() => true);

[mengw15]

Left one comment on the handoff lifetime.