🤖 fix: prevent escape from interrupting stream during message editing (#1010)

When editing a message while streaming, pressing Escape to cancel
editing would also interrupt the active stream. This is the same issue
fixed in PR #954 for workspace renaming.

Added `stopPropagation()` in both code paths:
- Non-vim mode: ChatInput's CANCEL_EDIT handler
- Vim mode: VimTextArea's escapeInNormalMode handler

This prevents the Escape keydown event from reaching the global stream
interrupt handler in `useAIViewKeybinds`.

_Generated with `mux`_

Author: ethanndickson

src/browser/components/ChatInput/index.tsx

@@ -1231,6 +1231,7 @@ export const ChatInput: React.FC<ChatInputProps> = (props) => {
     if (matchesKeybind(e, KEYBINDS.CANCEL_EDIT)) {
       if (variant === "workspace" && editingMessage && props.onCancelEdit && !vimEnabled) {
         e.preventDefault();
+        e.stopPropagation(); // Prevent global handler from interrupting stream
         setDraft(preEditDraftRef.current);
         props.onCancelEdit();
         const isFocused = document.activeElement === inputRef.current;

src/browser/components/VimTextArea.tsx

@@ -166,6 +166,7 @@ export const VimTextArea = React.forwardRef<HTMLTextAreaElement, VimTextAreaProp
         return;
       }
       if (result.action === "escapeInNormalMode") {
+        e.stopPropagation(); // Prevent global handler from interrupting stream
         onEscapeInNormalMode?.();
         return;
       }