Fix task viewer routing

[Pasindufdo98]

Description

This PR fixes multiple issues in the 9.x branch:

• Clicking Tasks in the unit dropdown menu now correctly loads the Task Viewer component. Previously, the button appeared unresponsive and the route was not updating.
• Fixed the task list panel so it scrolls independently as expected.
• Resolved an issue with the PDF viewer not displaying correctly.

After fixing routing issue.

After fixing both routing and UI issues.

Type of change

• Corrected the UI-Router state configuration to properly register the units/tasks/viewer state.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Ensured that the TaskViewerStateComponent is linked to the correct parent state (unit-root-state).
• Manually tested navigation to /units/:id/tasks/viewer while logged in as a Convenor, and confirmed it now loads the Task Viewer correctly instead of redirecting to the home page.

Testing Checklist:

• Tested in latest Chrome
• Tested in latest Safari
• Tested in latest Firefox

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[returnMarcco]

Hey @Pasindufdo98,

Good work on this fix.

The component routes as expected. I've left a suggestion on where to keep the state declaration, but other than that, everything looks good.

Once the feedback is reviewed and requested changes are made I'll approve this PR.

Cheers.

[returnMarcco]

Pre-approving this.

[chelaz1234]

Hi @Pasindufdo98,
The PR description is clear and well-scoped: it explains what was broken (task viewer routing, task list scrolling, PDF viewer) and what was fixed. The routing fix has been properly implemented and works as expected. Overall, great job!

[HasinduWelarathne]

Hey @Pasindufdo98 ,
Tested the routing changes and everything works as expected. The task viewer now loads correctly without navigation issues. Code looks clean and aligns well with the existing Angular structure. Great job on fixing this!