feat: remove dead code unit-task-list replaced by f-unit-task-list

[Sujay-Deakin]

Note: This is a cleaned-up version of PR #456, containing only the
relevant files under src/app/units/states/tasks/

Summary

This PR investigates the migration status of unit-task-list and verifies whether f-unit-task-list has fully replaced it, and removes the dead code.

What was checked

• Searched for all references to unit-task-list
• Verified usage of f-unit-task-list
• Compared old and new component responsibilities
• Tested the viewer flow locally

Findings

• unit-task-list is no longer actively used in the application
• The only occurrences are within its own directory and a commented reference in directives.coffee
• No templates or modules reference the old directive
• f-unit-task-list is actively used in tasks-viewer.component.html and renders correctly

Conclusion

f-unit-task-list has completely replaced unit-task-list. The old AngularJS files have been removed in this PR.

Suggested next step

• Proceed with migration of viewer.coffee as the next step in the tasks module migration