test(shared): cover pagination boundaries

[0takuc0mrade]

Summary

• adds the missing shared Pagination component
• clamps displayed page state and disables invalid previous/next navigation
• handles multi-page, single-page, and empty result sets
• exposes accessible navigation and button labels

Why

Upstream main did not contain the component named by the issue. The new API uses one conventional onPageChange(page) callback and native button semantics, keeping the component small and reusable.

Validation

• focused Bun test: 4 passed
• focused ESLint: passed
• focused Prettier: passed
• interaction coverage uses user-event plus role/text queries

Tests verify previous/next callback values, first/last boundaries, a single page, and zero pages.

The repository-wide checks remain affected by pre-existing upstream lint/typecheck failures outside these two new files.

Closes #342

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