Desktop app ignores `model` field in ~/.claude/settings.json

Summary

Setting "model": "claude-opus-4-7" in ~/.claude/settings.json is honoured by the claude CLI but ignored by the Claude Code desktop app.

Steps to reproduce

1. Add "model": "claude-opus-4-7" to ~/.claude/settings.json.
2. Start a new session via the claude CLI — status line shows Opus 4.7 (no 1M). ✅
3. Start a new session in the Claude Code desktop app — status line still shows Opus 4.7 1M. ❌
4. Full quit (⌘Q) and relaunch the desktop app — same behaviour.

Expected

Both CLI and desktop respect the model field in ~/.claude/settings.json as the default for new sessions.

Actual

CLI respects it; desktop app does not.

Notes

• Checked ~/Library/Application Support/Claude/window-state.json and Preferences — neither contains a model entry, so no obvious stale per-window state to clear.
• Use case: scheduled tasks were inheriting Opus 4.7 1M as the default and hitting context/rate issues. Setting a global default in settings.json was meant to fix that; the desktop-side gap means scheduled tasks dispatched from the desktop app still pick up 1M.

Environment

• macOS
• Claude Pro plan