fix: autofix navigation on subgraph create undo

[maxy-shpfy]

Description

When a user is navigating inside a nested subgraph and performs an undo/redo operation that removes that subgraph, the navigation path becomes invalid (i.e., activeSpec is null while the path depth is greater than 1). This leaves the editor in a broken state with no visible spec.

A correctInvalidNavigation action has been added to NavigationStore that trims the navigation path back to the deepest level that still resolves to a valid spec. A MobX reaction in useSpecLifecycle watches for this condition and triggers the correction automatically whenever it occurs.

Related Issue and Pull requests

Type of Change

• Bug fix

Checklist

• I have tested this does not break current pipelines / runs functionality
• I have tested the changes on staging

Screenshots (if applicable)

Screen Recording 2026-04-22 at 10.47.29 PM.mov (uploaded via Graphite)

Test Instructions

1. Open a pipeline that contains at least one nested subgraph/component.
2. Navigate into the subgraph so the navigation path depth is greater than 1.
3. Perform an undo operation that removes the subgraph you are currently viewing.
4. Verify that the editor automatically navigates back to the deepest still-valid level rather than displaying a blank or broken state.
5. Confirm that redo restores the subgraph and normal navigation resumes as expected.

Additional Comments

The disposeNavGuard cleanup is registered alongside the existing disposeTaskWatcher to ensure the reaction is torn down properly when the editor unmounts.

[github-actions]

🎩 Preview

A preview build has been created at: 04-22-fix_autofix_navigation_on_subgraph_create_undo/67f97e7

[maxy-shpfy]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• fix: v2 - rename pipeline name and file name #2160
• fix: autofix navigation on subgraph create undo #2145 👈 (View in Graphite)
• fix: windows state persistence and default layout #2144
• fix: display any validation issues including warnings in v2 #2143
• fix: track subgraph history #2141
• fix: annotations in configuration section respect ignore keys list #2113
• fix: history redo entries display order #2112
• fix: validation of the componentRef of task #2111
• fix: subgraph create should deduplicated bindings on name conflict #2110
• fix: import pipeline in v2 should navigate to a proper file #2109
• fix: restore auto-scaling for collapsed nodes in v2 #2108
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.

[camielvs]

lgtm