fix: stop the auto-refresh timer on unmount (it repaints over other plugins)

[AJV009]

Problem

After visiting the Sessions tab, switching to any other plugin tab shows the Claude Sessions table again a few seconds later — the other plugin's UI is replaced by this one's.

Reproduced against the PRISM plugin:

1. Open the Sessions tab
2. Switch to PRISM
3. PRISM renders correctly, then within 10s its panel is replaced by the Claude Sessions table

Uninstalling this plugin made PRISM render correctly and permanently, which isolated the source.

Cause

intervalId and stopAuto() are declared inside mount()'s closure:

export function mount(container, api) {
  let intervalId = null;
  ...
  function stopAuto() {
    if (intervalId) { clearInterval(intervalId); intervalId = null; }
  }

but unmount() is a separate top-level export with no access to that closure:

export function unmount(container) {
  container.innerHTML = '';
  const styles = document.getElementById('sm-styles');
  if (styles) styles.remove();
}

So clearInterval is never called. The 10s timer outlives unmount and keeps calling fetchSessions(), which re-renders into the container captured by the closure. CloudCLI reuses a single container for the active tab plugin, so the orphaned timer paints this plugin's table over whatever is mounted there now.

Fix

Hold the closure's stopAuto in a module-scoped activeStopAuto and invoke it from unmount(). Three lines plus a comment.

dist/index.js is a verbatim copy of src/index.js (no build step), so both files are updated identically.

Verification

Linux, Chrome, CloudCLI 1.37.2, with PRISM installed alongside:

• Before: switch Sessions → PRISM, PRISM's panel is replaced by the session table within 10s
• After: PRISM's panel is still intact 16s later (well past one timer period), and the Sessions tab itself still renders and auto-refreshes normally

🤖 Generated with Claude Code

https://claude.ai/code/session_011WfoF1z5anUFtH61ECn1ZF