Web/Desktop model picker permanently hides catalog models that lack a family field (e.g. opencode-go/omen-alpha) #47557

Description

Catalog models that lack a family field are permanently hidden from the web UI / Desktop model picker, while the TUI and the server API still return them.

Concretely: opencode-go/omen-alpha (released 2026-09-04) is the only model of its provider without a family key in the catalog. It never shows up in the model picker of the web UI or the Desktop app, even though GET /config/providers and /api/model both include it, and the TUI lists it.

Root cause in packages/app/src/context/models.tsx:

• latest() groups models with remeda groupBy((x) => x.family) and keeps only the newest model per group.
• remeda's groupBy drops items whose mapper returns undefined (verified against current remeda: pipe([{ family: undefined }], groupBy((x) => x.family)) → {}), so a family-less model lands in no group and never enters latestSet.
• visible() then hides it: its release_date is valid, so the !date?.isValid → show fallback doesn't apply either.
• The picker list is built from visible()-filtered items, so there is also no way to manually re-show the model.

Suggested fix: groupBy((x) => x.family ?? "_none"), or treat family-less models like date-less ones in visible().

Workaround (confirmed working): give the model a family via config override:

{
  "provider": {
    "opencode-go": {
      "models": {
        "omen-alpha": { "family": "omen" }
      }
    }
  }
}

After restarting, the picker shows the model (tagged as latest).

Related: #45934 (same file, but a different filter branch — the 6-month release window), #28484 (feature request to surface this visibility filter).

OpenCode version

1.18.11 (CLI/web) and 1.18.29 (Desktop) — packages/app/src/context/models.tsx is identical in both tags.

Steps to reproduce

1. Have a connected provider whose catalog entry lacks family (e.g. opencode-go/omen-alpha).
2. Open the web UI model picker (or Desktop): the model is absent from its provider section.
3. GET /config/providers on the same server: the model is present.
4. Apply the config override above and restart: the model appears.

Operating system

Windows 11