Missing Opus 4.8 in model picker + missing `xhigh` in Claude effort picker

[Gnonymous]

Two gaps in the picker on iOS 1.7.0, both tied to the same upstream lag.

1. Model — Opus 4.8 missing. default falls back to Opus 4.7. Same issue as #1344, blocked by #1265 (zod v3/v4 conflict), which was closed 2026-06-08 but not yet released to npm or App Store.

2. Effort — xhigh missing. Anthropic introduced xhigh in Opus 4.7 between high and max (announcement, docs). The Opus 4.8 prompting guide recommends it as the default for coding agents.

Env

• iOS Happy: 1.7.0 (App Store latest)
• CLI: happy 1.1.8 / @anthropic-ai/claude-agent-sdk 0.2.140
• macOS arm64, host claude already serves claude-opus-4-8

Asks

1. Cut a release that picks up the fix: zod v3/v4 peer dependency conflict in @anthropic-ai/claude-agent-sdk #1265 fix to unblock Opus 4.8.
2. Add xhigh to the Claude effort selector.

Happy to close in favor of #1344 if preferred.