fix(channels): dismiss tool feedback animation when turn ends via ResponseHandled

When a tool sets ResponseHandled=true (e.g., send_file), the turn ends
without producing a final assistant response. This meant no outbound
message triggered FinalizeToolFeedbackMessage, leaving the animation
goroutine running indefinitely — editing the Feishu card every 3 seconds
with "." / ".." suffixes long after the tool had finished.

Fix: call DismissToolFeedback at "Tool output satisfied delivery" so the
tracker is cleared and the animation goroutine is stopped immediately.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pkg/agent/interfaces/interfaces.go

@@ -44,4 +44,9 @@ type ChannelManager interface {
 
 	// SendPlaceholder sends a placeholder message (e.g., for audio transcription).
 	SendPlaceholder(ctx context.Context, channel, chatID string) bool
+
+	// DismissToolFeedback clears any tracked tool feedback animation for the
+	// given channel/chat. Call this when a turn ends without a final response
+	// (e.g., ResponseHandled tools) to avoid orphaned animation goroutines.
+	DismissToolFeedback(ctx context.Context, channel, chatID string)
 }

pkg/agent/pipeline_execute.go

@@ -704,6 +704,9 @@ toolLoop:
 		}
 		ts.setPhase(TurnPhaseCompleted)
 		ts.setFinalContent("")
+		if al.channelManager != nil && ts.channel != "" {
+			al.channelManager.DismissToolFeedback(ctx, ts.channel, ts.chatID)
+		}
 		logger.InfoCF("agent", "Tool output satisfied delivery; ending turn without follow-up LLM",
 			map[string]any{
 				"agent_id":   ts.agent.ID,

pkg/channels/manager.go

@@ -192,6 +192,17 @@ func clearTrackedToolFeedbackMessage(
 	}
 }
 
+// DismissToolFeedback clears any tracked tool feedback animation for the
+// given channel/chat. This is called when a turn ends without a final
+// response (e.g., ResponseHandled tools) to stop orphaned animation goroutines.
+func (m *Manager) DismissToolFeedback(ctx context.Context, channelName, chatID string) {
+	ch, ok := m.GetChannel(channelName)
+	if !ok {
+		return
+	}
+	dismissTrackedToolFeedbackMessage(ctx, ch, chatID, nil)
+}
+
 func prepareToolFeedbackMessageContent(ch Channel, content string) string {
 	prepared := strings.TrimSpace(content)
 	if prepared == "" {