fix(vscode): send an editor comment to the sidebar chat instead of opening a tab

A comment went to the active session tab, and when there was none it opened
a new one, even while the user was chatting in the sidebar. That is not how
the other capture flows behave. The comment now takes the same route as
Add to Context: the active session tab when one exists, otherwise the
sidebar, revealed if it is closed.

Claude-Session: https://claude.ai/code/session_01VqV56Hez25hTxXH4ipJfzH

packages/vscode/src/extension.ts

@@ -489,15 +489,14 @@ export async function activate(context: vscode.ExtensionContext) {
   // the authoritative list, so the threads follow what the webview reports.
   const inlineCommentThreads = new InlineCommentThreads({
     submitDraft: async (payload) => {
-      // A comment is written against code the user is reading, so it cannot
-      // require them to have opened a chat first: with no session tab open,
-      // one is opened, exactly as the toolbar's new-session button does.
-      const panelId = sessionEditorProvider?.openWithLineComment(payload, activeSessionId);
+      // Same routing as Add to Context: a session tab the user is working in
+      // takes the comment; otherwise it goes to the sidebar, revealing it when
+      // needed. Opening a fresh tab for a comment left the user's sidebar chat
+      // ignored and a new tab in the way.
+      const panelId = sessionEditorProvider?.addLineCommentToActivePanel(payload);
       if (panelId) {
         return panelId;
       }
-      // No session editor at all (provider gone): fall back to the sidebar
-      // rather than accepting a comment that has nowhere to land.
       if (!(await revealChatViewForPayload())) {
         return null;
       }