Fixes #2892.

Problem

The AI chat assistant is fully broken on strict-schema openai-compatible endpoints (llama.cpp / vLLM / LM Studio with structured outputs). The browser throws:

Error: JSON schema conversion failed: Unrecognized schema: {"description":"Setting value for the path. Type depends on the path definition."}

and the assistant returns nothing.

Root cause

updateAssistantSettings declares its value as z.unknown(), which emits a JSON Schema node with no type. With supportsStructuredOutputs: true on the provider (utils/llms/model.ts), the tool schema goes to the endpoint’s structured-output path, where the server’s grammar builder (e.g. llama.cpp json-schema-to-grammar) rejects the typeless node — aborting the whole tool set.

Fix

Replace z.unknown() with an explicit union of the value shapes the settings paths accept (primitives, arrays of primitives, and the existing object schemas). The per-path type is still re-validated downstream against the strict settingsChangeSchema discriminated union, so this only needs to be a permissive, fully-typed superset. A naive z.record(...) would emit additionalProperties:false with no properties and silently reject object values, so the union is the correct shape.

Validation

Reproduced the emitted tool JSON Schema on the pinned SDK versions: the old schema emits the typeless node verbatim; the new one emits zero typeless nodes and accepts string/number/boolean/null/array/object.

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