feat: add safari 26.3

[mingyech]

No description provided.

[Copilot]

Pull request overview

Adds a new Safari ClientHello parrot preset and makes it the default Safari “Auto” fingerprint, updating the library’s Safari TLS handshake emulation to a newer profile.

Changes:

• Add HelloSafari_26_3 ClientHelloID and map it to a new ClientHelloSpec in utlsIdToSpec.
• Update HelloSafari_Auto to point to HelloSafari_26_3 instead of HelloSafari_16_0.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
u_parrots.go	Introduces the HelloSafari_26_3 ClientHelloSpec (ciphers/extensions/curves/keyshares) in the parrot switch.
u_common.go	Registers the new HelloSafari_26_3 ID and updates HelloSafari_Auto to use it by default.

Comments suppressed due to low confidence (2)

u_parrots.go:2246

• A new HelloSafari_26_3 fingerprint is introduced here, but there isn't a corresponding test ensuring the preset can be converted via UTLSIdToSpec and successfully applied via ApplyPreset (and that the resulting extension list/keyshares match expectations). Adding a small unit test would help prevent future regressions in this fingerprint.

	case HelloSafari_26_3:
		return ClientHelloSpec{
			TLSVersMin: VersionTLS12,
			TLSVersMax: VersionTLS13,
			CipherSuites: []uint16{

u_common.go:661

• HelloSafari_Auto now points to HelloSafari_26_3, which changes the default Safari parrot behavior for any callers using the auto preset (e.g., drops TLS 1.0/1.1 support and changes the extension set). If this is intended, it would be good to treat it as an API/behavior change (e.g., mention in release notes / CHANGELOG); otherwise consider keeping HelloSafari_Auto on the previous preset for backward compatibility and letting callers opt into HelloSafari_26_3 explicitly.

	HelloSafari_Auto = HelloSafari_26_3

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.