docs: migrate Hyperliquid to HIG shell presentation

[joeblau]

Migrates Hyperliquid’s shared docs presentation for bloxwap/hig #34. HIG 0.1.0 candidate tokens and CSS primitives replace the copied token palette; Bloxwap Sans now supplies headings, controls use HIG geometry/comfortable targets, and the footer follows content so it cannot cover the playground.

Fumadocs retains its navigation/search/MDX adapters. All 13 documentation pages, API examples, metadata, deep links, /hyperliquid static asset paths, and the market playground’s SDK transport/feed/reconnection logic are preserved. Shared clipboard handling now reports denial and cleans up timers; offline search failures have visible guidance.

HIG has no npm release (#32), so this uses the kit’s approved plain CSS path as a private local file package. The byte-identical upstream CSS, MIT license, source commit 1a776b9326c6ba03702894943b3edbfd178c4b40, and SHA-256 hashes are checked in. No npm publishing, tags/releases, or production deployment changes.

Validation and before/after screenshots, measurements, five-repository status matrix, exceptions and rollback instructions are in apps/docs/design-review/hig/README.md.

Validation:

• bun run check: format, lint, content, SDK TS5/TS7, JSDoc, exports and import budgets pass (existing non-fatal lint warnings remain).
• bun run docs:check: content/navigation checks and Next/TypeScript pass.
• NEXT_PUBLIC_BASE_PATH=/hyperliquid bun run docs:build: production static export passes; 13 docs pages, 20 HTML files, 1,168 internal links/assets, 355 anchors, 14 unique social cards and 22 agent artifacts verified.
• bun run build: SDK build passes.
• bun run test:offline --timeout 30000: 2,087 pass, 244 skip, 0 fail, 76,722 assertions across 255 files. An initial five-second timeout in the unchanged HIP-3 schema fixture under VM memory pressure prompted a full rerun with unchanged assertions. Docs helpers: 10 pass, 0 fail.
• bun run --cwd apps/docs test:browser: six tests pass against the production export. Covers keyboard install, clipboard success/denial, search/empty/offline states, mobile sidebar/deep links, large text/RTL, real SDK subscriptions using deterministic WebSocket frames, payload/asset/off/loading/rejection/retry behavior and footer non-overlap. Added to docs CI.
• A separate unmocked Chromium session reached Live and received a BTC mid-price; timestamp/payload are in live-market.json.

Full-export CSS: 159,189 → 158,685 bytes; JS: 1,355,870 → 1,356,112 bytes. The original Space Grotesk TTF removes 116,056 bytes; copied token CSS removes 5,921 bytes. Export totals include cache-retained font assets and are not initial-load measurements.

Exceptions: candidate distribution pending #32 publication, Fumadocs host adapters intentionally retained. Physical iOS/Android devices, VoiceOver/TalkBack, tactile feedback and wide-gamut fidelity cannot be certified on this Linux VM. No hardware result is claimed. This PR covers the Hyperliquid row only; #34 remains open for the other four migrations and upstream adoption-ledger reconciliation. Do not close the cross-repository issue from this PR.

Final CI on 5e6d02a9cc27d0b47048549658d5015b5cb0b345: documentation/build/types/browser/link checks, code quality, offline tests, security, and performance attempt 2 all pass. gh pr checks --watch completed successfully; the deployment job is skipped for this PR.

Performance transparency: the two initial CI runs flagged different SDK microbenchmarks (l1_action_hash_with_vault_and_expiry and canonicalize_order_1). SDK source, benchmark source, thresholds and performance workflow have no diff from the base. Rerunning the same final-head job passed without code/gate changes; no performance threshold was loosened and no retry logic was added. Local transient failures and their full unchanged-assertion rerun are described above.