feat: add Pagination component

[patrickkuei]

Closes #11

Summary

• Adds a Pagination component: a cyberpunk-styled page control for list/table views with more results than fit on one page, always controlled via currentPage/totalPages/onPageChange.
• API decisions: compact (default true) collapses distant page numbers behind an ellipsis using a standard boundary/sibling-window algorithm (siblingCount/boundaryCount, both tunable), falling back to rendering every page when the total already fits — compact={false} forces the full list regardless of count. variant (primary/secondary/accent) reuses Button/Badge/Tooltip's existing palette vocabulary for the active-page highlight and hover glow rather than inventing new colors. Page/Previous/Next controls are plain native <button>s in normal tab order (not a roving-tabindex widget, since pagination isn't a single-selection group the way RadioGroup/Accordion are) with aria-current="page" on the active page; Home/End jump to the first/last page from anywhere inside the control as an added convenience.
• No scope was deferred — the issue's full ask (controlled currentPage/totalPages/onPageChange, compact ellipsis mode for large page counts, prev/next controls, responsive size, neon active-page highlight with hover glow matching Button/Badge) is covered in this PR.

Changes

• Added Pagination (src/components/Pagination.tsx) — currentPage, totalPages, onPageChange, compact, siblingCount, boundaryCount, showPrevNext, variant, responsive size, disabled, ariaLabel, className.
• Added a pagination entry to RESPONSIVE_SIZE_MAPS in src/utils/responsive.ts.
• Exported Pagination/PaginationProps from src/components/index.ts.
• Stories (Pagination.stories.tsx): Default (controlled demo), Secondary, Accent, Sizes, Disabled, CompactCollapsing (200-page archive), ExpandedMode (compact={false}), NoPrevNext, Controlled, and an AllVariants render story (cyberpunk copy throughout, e.g. "Loading archive shard 3 of 30…").
• Tests (Pagination.test.tsx, 17 cases): renders without crashing, full page list for small totals, aria-current="page" wiring, page-click onPageChange, no-op click on the already-current page, controlled behavior (state only changes when the prop does), Previous/Next click advancing/retreating, Previous/Next disabled at the boundaries, showPrevNext={false} omits the controls, ellipsis collapsing for large totals, full list with compact={false}, custom siblingCount/boundaryCount, Home/End keyboard jumps, disabled state blocks every control, renders nothing for totalPages < 1, custom ariaLabel/className, responsive size.
• Wired Pagination into scripts/generate-manifest.js (CATEGORY_MAP → Navigation, alongside DropdownMenu; DOC_SUMMARIES) and regenerated docs via npm run docs:generate — diff reviewed, only Pagination-related lines changed.
• Added a CHANGELOG entry under [Unreleased].

Test plan

• npm run lint / type-check / test -- --project=unit all pass (312 tests, including 17 new for Pagination)
• Storybook: Default + variants + sizes + disabled + AllVariants render correctly
• Keyboard nav + screen reader smoke test

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