href navigation entries break tab routing when pointing to other tabs' URL prefixes

[laura-mlg]

Description:

W're migrating our docs to Mintlify. When using tabs in docs.json navigation, adding href entries that point to pages owned by a different tab causes ALL tabs to lose their URL prefix resolution. The sidebar shows the wrong tab's content on every page.

Steps to reproduce:

1. Create a docs.json with multiple tabs, each with pages under distinct URL prefixes (/cli/..., /cloud/..., /coverage/...)
2. In the first tab (Home), add href entries pointing to other tabs:

  {
    "tab": "Home",
    "groups": [{
      "group": "Introduction",
      "pages": [
        "what-is-qlty",
        {"href": "/cli/quickstart", "title": "CLI Quick Start"},
        {"href": "/cloud/quickstart", "title": "Cloud Quick Start"}
      ]
    }]
  }

3. All tabs resolve to href="/" instead of their correct prefix. The sidebar shows the wrong tab on every page.

Expected behaviour: href entries should be treated as sidebar links only — they should NOT participate in tab URL prefix calculation. This is how Fern handles link: vs page: entries.

Actual behaviour: href entries are included in tab prefix resolution, making it impossible for Mintlify to determine which tab owns which URL prefix. Removing the href entries fixes all tabs.

Workaround: Remove all cross-tab href entries. This means losing 5 sidebar convenience links that exist in our current production site.

Environment: Mintlify CLI 1.0.0, mint theme, 6 tabs