fix: reset cancel button state when streaming ends or task changes

- Reset didClickCancel flag when streaming transitions from active to inactive
- Reset didClickCancel flag when switching between tasks
- Reset didClickCancel flag during chat reset operations
- Fixes issue where cancel button remained inactive after clicking cancel

Fixes #9303

Author: roomote

webview-ui/src/components/chat/ChatView.tsx

@@ -414,6 +414,7 @@ const ChatViewComponent: React.ForwardRefRenderFunction<ChatViewRef, ChatViewPro
 		everVisibleMessagesTsRef.current.clear() // Clear for new task
 		setCurrentFollowUpTs(null) // Clear follow-up answered state for new task
 		setIsCondensing(false) // Reset condensing state when switching tasks
+		setDidClickCancel(false) // Reset cancel button state when switching tasks
 		// Note: sendingDisabled is not reset here as it's managed by message effects
 
 		// Clear any pending auto-approval timeout from previous task
@@ -524,6 +525,7 @@ const ChatViewComponent: React.ForwardRefRenderFunction<ChatViewRef, ChatViewPro
 		setSelectedImages([])
 		setClineAsk(undefined)
 		setEnableButtons(false)
+		setDidClickCancel(false) // Reset cancel button state when chat resets
 		// Do not reset mode here as it should persist.
 		// setPrimaryButtonText(undefined)
 		// setSecondaryButtonText(undefined)
@@ -961,6 +963,11 @@ const ChatViewComponent: React.ForwardRefRenderFunction<ChatViewRef, ChatViewPro
 			}
 		}
 
+		// Reset didClickCancel when streaming ends
+		if (wasStreaming && !isStreaming) {
+			setDidClickCancel(false)
+		}
+
 		// Update previous value.
 		setWasStreaming(isStreaming)
 	}, [isStreaming, lastMessage, wasStreaming, messages.length])