Replace U+202F with U+00A0.

Signed-off-by: Katharine Berry <[email protected]>

Author: Katharine

service/assistant/session.go

@@ -183,7 +183,7 @@ func (ps *PromptSession) Run(ctx context.Context) {
 				ourContent := ""
 				for _, c := range choice.Content.Parts {
 					if c.Text != "" {
-						ourContent += c.Text
+						ourContent += fixUnsupportedCharacters(c.Text)
 					}
 					if c.FunctionCall != nil {
 						fc := *c.FunctionCall
@@ -383,6 +383,11 @@ func (ps *PromptSession) Run(ctx context.Context) {
 	_ = ps.conn.Close(websocket.StatusNormalClosure, "")
 }
 
+func fixUnsupportedCharacters(s string) string {
+	// Replace the narrow non-breaking space with a regular non-breaking space.
+	return strings.ReplaceAll(s, "\u202f", "\u00a0")
+}
+
 func (ps *PromptSession) storeThread(ctx context.Context, messages []*genai.Content) error {
 	ctx, span := beeline.StartSpan(ctx, "store_thread")
 	defer span.Send()