Fix unstaging renamed files

[MattPua]

Problem

Renamed files in code review could not be fully unstaged because the action only sent the original path to Git.

Why: Users need the unstage button to work consistently for staged renames.

Changes

• Send both the original and current paths when toggling a renamed file
• Add regression coverage for regular and renamed path selection

How did you test this?

• pnpm --dir packages/ui exec vitest run src/features/task-detail/hooks/stageTogglePaths.test.ts
• pnpm exec biome check packages/ui/src/features/task-detail/hooks/stageTogglePaths.ts packages/ui/src/features/task-detail/hooks/stageTogglePaths.test.ts packages/ui/src/features/task-detail/hooks/useStageToggle.ts
• pnpm exec turbo typecheck --filter=@posthog/ui

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

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Created with PostHog Code

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[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 7f167ac.}