Embedding model auto-selected as chat model

[daveshenal]

Describe the bug

• When models load for the first time, the store auto-selects the first model in the list. If nomic-embed-text appears first, it gets set as the active chat model. Sending a message returns an empty response with no error.

Expected behavior

• Embedding models (nomic-embed-text, any model containing embed) should be excluded from the chat model selector
• If the current active model is an embedding model, auto-select the first non-embedding model instead
• Optionally: show embedding models in a separate section labelled "Embedding Models"

Steps to reproduce

• Have nomic-embed-text and a chat model installed
• Open Outpost - nomic-embed-text gets auto-selected
• Send a chat message - empty response, no error

Affected files

• frontend/src/store.js - fetchModels auto-select logic needs to filter out embedding models
• frontend/src/pages/ModelsPage.jsx - model list should separate chat vs embedding models