Rename anime visibility heading to title visibility

- Update trends filter heading text
- Add regression test for rendered label

backlog/completed/task-285 - Rename-anime-visibility-filter-heading-to-title-visibility.md

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+---
+id: TASK-285
+title: Rename anime visibility filter heading to title visibility
+status: Done
+assignee:
+  - codex
+created_date: '2026-04-10 00:00'
+updated_date: '2026-04-10 00:00'
+labels:
+  - stats
+  - ui
+  - bug
+milestone: m-1
+dependencies: []
+references:
+  - stats/src/components/trends/TrendsTab.tsx
+  - stats/src/components/trends/TrendsTab.test.tsx
+priority: low
+ordinal: 200000
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Align the library cumulative trends filter UI with the new terminology by renaming the hardcoded anime visibility heading to title visibility.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+
+<!-- AC:BEGIN -->
+- [x] #1 The trends filter heading uses `Title Visibility`
+- [x] #2 The component behavior and props stay unchanged
+- [x] #3 A regression test covers the rendered heading text
+<!-- AC:END -->