feat(tasks): add filter for automated vs manual evidence tasks

[tofikwest]

Summary

• Adds an "Automated / Manual" filter dropdown to the task list, matching the existing filter pattern (status, assignee, framework)
• Client-side filtering using automationStatus field already present on tasks
• Filter state stored in URL via nuqs for shareable/bookmarkable views

Test plan

• Unit tests added (7 tests covering all filter states)
• Verify filter dropdown appears next to existing filters
• Verify selecting "Automated" shows only automated tasks
• Verify selecting "Manual" shows only manual tasks
• Verify "All types" resets the filter
• Verify result count updates correctly

Resolves SALE-2

🤖 Generated with Claude Code

[linear]

SALE-2 Filter evidence tasks by automated / manual

[cursor]

PR Summary

Low Risk
Low risk UI/client-side filtering change that only affects task list presentation and URL query state; no backend or data mutation logic is modified.

Overview
Adds an Automation type dropdown (All types / Automated / Manual) to TaskList, persisting the selection in the URL via nuqs (automationStatus) and applying it to the client-side filteredTasks predicate.

Updates the result-count visibility logic to include the new filter, and adds a focused unit test suite (TaskList.test.tsx) covering default, AUTOMATED, and MANUAL filter behavior plus dropdown option rendering.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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