chore(telemetry): track conversation undo, shell mode, and effort changes (#1271)

* chore(telemetry): track conversation undo, shell mode, and effort changes

- conversation_undo: fires when an undo reverts history (double-Esc selector, /undo, /undo N)
- shell_command: fires when a ! shell command runs in the TUI
- thinking_toggle: now fires on any effort change (not just on/off flips) and carries { enabled, effort, from }; align the no-session TUI path to the same payload

* chore(telemetry): track conversation_undo in core undoHistory

Tracking it in the TUI only covered the TUI; web/acp/REST undos reach
core.rpc.undoHistory directly and were missed. Emit the event from the
agent undoHistory RPC after the undo succeeds so every host is covered,
and drop the now-redundant TUI track.

Addresses review feedback on #1271.

apps/kimi-code/src/tui/commands/config.ts

@@ -422,7 +422,11 @@ async function performModelSwitch(
       host.track('model_switch', { model: alias });
     }
     if (effort !== prevEffort) {
-      host.track('thinking_toggle', { effort });
+      host.track('thinking_toggle', {
+        enabled: effort !== 'off',
+        effort,
+        from: prevEffort,
+      });
     }
   }
 

apps/kimi-code/src/tui/kimi-tui.ts

@@ -955,6 +955,8 @@ export class KimiTUI {
     this.setAppState({ streamingPhase: 'shell' });
     this.state.ui.requestRender();
 
+    this.track('shell_command');
+
     void session.runShellCommand(command, { commandId }).then(
       ({ stdout, stderr, isError, backgrounded }) => {
         this.finishShellOutput(commandId, stdout, stderr, isError, backgrounded);

apps/kimi-code/test/tui/kimi-tui-message-flow.test.ts

@@ -1766,13 +1766,15 @@ command = "vim"
   it('echoes a bash command with a $ prompt in the transcript', async () => {
     const runShellCommand = vi.fn(async () => ({ stdout: '', stderr: '', isError: false }));
     const session = makeSession({ runShellCommand });
-    const { driver } = await makeDriver(session);
+    const { driver, harness } = await makeDriver(session);
     driver.state.appState.inputMode = 'bash';
     driver.state.editor.inputMode = 'bash';
 
     driver.handleUserInput('ls');
     await Promise.resolve();
 
+    expect(harness.track).toHaveBeenCalledWith('shell_command', undefined);
+
     const transcript = stripSgr(driver.state.transcriptContainer.render(120).join('\n'));
     expect(transcript).toContain('$ ls');
     expect(transcript).not.toContain('! ls');