fix: make tui session text respect theme fg (anomalyco#4618) (anomalyco#4620)

Author: tylimbach

packages/opencode/src/cli/cmd/tui/routes/session/index.tsx

@@ -1098,7 +1098,7 @@ function ReasoningPart(props: { last: boolean; part: ReasoningPart; message: Ass
 
 function TextPart(props: { last: boolean; part: TextPart; message: AssistantMessage }) {
   const ctx = use()
-  const { syntax } = useTheme()
+  const { theme, syntax } = useTheme()
   return (
     <Show when={props.part.text.trim()}>
       <box id={"text-" + props.part.id} paddingLeft={3} marginTop={1} flexShrink={0}>
@@ -1109,6 +1109,7 @@ function TextPart(props: { last: boolean; part: TextPart; message: AssistantMess
           syntaxStyle={syntax()}
           content={props.part.text.trim()}
           conceal={ctx.conceal()}
+          fg={theme.text}
         />
       </box>
     </Show>