Show installed extension version in the popup

[Copilot]

The extension already carried version metadata in the manifest, but there was no visible way to identify the installed build from the UI. This adds a lightweight version readout to the popup so users can confirm the exact extension version at a glance.

• Popup version display

  • Added a dedicated version element to the popup UI.
  • Positioned it as low-emphasis metadata so it is visible without competing with the main controls.

• Single source of truth

  • Reads the displayed value directly from the extension manifest at runtime via chrome.runtime.getManifest().version.
  • Avoids duplicating version strings in popup code or markup.

versionEl.textContent = `Version ${chrome.runtime.getManifest().version}`

• Fixes Add version number to the extension for easy identification. #14

[github-actions]

🟢 Claude BugBot Analysis

This PR only adds a version label to the popup UI (HTML element, CSS style, and JS to populate it from chrome.runtime.getManifest().version); no logic errors, null dereferences, or security issues were found.

No bugs were detected in this PR.

[cursor]

Approved. The present automated review completed without findings that need human review, and no approval policy requires extra scrutiny. No reviewers were assigned.

  

_{Sent by Cursor Approval Agent: Pull Request Router and Approver}