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Closes #3192 Root cause ---------- The artifact preview header is driven by a Radix Select whose <SelectValue> renders the label of the <SelectItem> matching the current value. The option list was built solely from `artifacts` in ArtifactsContext, which is only synced from `thread.values.artifacts` (chat-box.tsx). Artifacts surfaced via the message-layer `present_files` tool call are never written back to `thread.values.artifacts`, so when such a file is selected its filepath has no matching <SelectItem>. Radix then renders an empty trigger and the header filename appears blank, even though the preview body loads correctly. Fix --- Compute `artifactOptions` as a defensive union: if the currently selected filepath is missing from `artifacts`, prepend it so a matching <SelectItem> always exists. This keeps the header label in sync with the active file without changing context semantics or coupling the UI to a future auto-discovery mechanism (see existing TODO in chat-box.tsx). Tests ----- Add an e2e case that mocks a thread whose only artifact is delivered via `present_files` (thread.values.artifacts = []) and asserts both the header title and preview content render. All 21 e2e tests pass.