feat(ios): extend Apple GPU detection with missing chips + iOS version filter

[puckey]

Summary

Builds on @HarshdeepKahlon's #146 with UA-aware iOS version detection, chipset-candidate filtering, a few corrections on the chip additions, a small perf win, and one dep drop.

Commits

1. 97b23ff / 700b0f1 — @HarshdeepKahlon's chipset additions (A18 / A18 Pro / A19 / A19 Pro on iPhone; M3 / M4 / M5 on iPad), picked from add apple m3, m4, m5, a18 + pro, a19 + pro #146.
2. 9b21de2 — our combined feature commit.

What's in the combined commit

1. Chipset corrections

• Rename the iPhone A17 entry to a17 pro. Apple only ever shipped A17 Pro, and apple a17 gpu did not exist in any benchmark file, so the previous entry emitted a string that never matched.
• Add A16 (2025 iPad Air / iPad 11) and A17 Pro (iPad mini 7) to the iPad chipset list.
• Drop FALLBACK test cases for A19 / A19 Pro / M5 — all three are present in the benchmark JSON and correctly resolve to BENCHMARK.

2. UA-aware chipset filter

On iOS Safari the WebGL renderer is masked to Apple GPU. detect-gpu works around this with a fragment-shader pixel-ID trick that yields a pool of candidate chips; the benchmark matcher picks one by screen-size distance. The candidate pool previously included every chip that could theoretically run iOS 14+ — far wider than necessary.

This PR parses the iOS major version from the UA and drops chips the device cannot run:

OS	Min iPhone chip	Min iPad chip
iOS/iPadOS 13–15	A9	A8
iOS/iPadOS 16	A10	A9
iOS/iPadOS 17–18	A12	A10
iOS/iPadOS 26	A13	A12

3. UA parsing edge cases

• iOS 26+ freezes the iPhone OS 18_6 token as a fingerprinting countermeasure. The real iOS major is exposed only via Version/N. The parser prefers Version/ whenever it disagrees upward with the OS token.
• Pre-iOS-7 Safari Version/ tracked Safari, not iOS (Safari 4 on iOS 3.2, Safari 5 on iOS 4). Falls back to the OS token when OS < 7.
• iPadOS "Request Desktop Site" UAs are Mozilla/5.0 (Macintosh; ...) with no iPhone/iPad token. The parser still fires because isIpad is true via MacIntel + maxTouchPoints > 0.
• In-app browsers (Facebook, Slack, Snapchat, etc.) hide the iOS version in proprietary tokens. These yield undefined → the filter becomes a safe no-op.

4. Pixel-ID shader short-circuit on iOS 14+

Apple normalized the shader output in iOS 14, so all modern devices return the same codeFB — which the old code used purely as a "this is iOS 14+" signal. The UA now provides that signal directly, without the shader compile + draw + readPixels round-trip. The shader path is retained as the fallback for iOS 12.x / 13.x devices, where the three distinct pixel IDs still discriminate A7 vs A8–A10 vs A11+ within a single iOS version.

5. Drop webgl-constants dependency

The shader function used 9 WebGL enum constants (GL_ARRAY_BUFFER, GL_FLOAT, etc.) from the webgl-constants package. Inlined them as module-local const declarations with a Khronos spec link; minifier gets the same literal folding, one fewer runtime dependency.

Tests

• test/deobfuscateAppleGPU.test.ts — 11 unit tests for filterByIOSVersion, covering every cutoff and the M-series passthrough.
• test/deviceInfo.test.ts — 6 UA-shape tests for parseIOSVersion via a stubbed navigator.
• test/iosUserAgents.test.ts — runs parseIOSVersion against a 129-entry iOS UA corpus (iOS 1–18) sourced from ua-parser/uap-core's test_os.yaml, plus explicit pre-iOS-7 / iOS 26 freeze / separator-variant tests. Asserts the parser never returns a wrong major and recognizes 100% of UAs with one of the two standard tokens.
• test/fixtures/ios-user-agents.json — the 129-entry corpus.

All 1666 tests pass; lint, format, build, and typecheck clean. Bundle: 7.65 kB / 3.61 kB gzip.

Suggested release bump

Adds new behavior (filtering) and a new exported helper (parseIOSVersion). Suggest a minor bump when triggering the release workflow.

Test plan

• pnpm test — 1666 tests pass
• pnpm lint passes
• pnpm format:check passes
• pnpm build succeeds
• CI confirms the same