fix: vite based project support

[damiant]

This pull request updates the extension to version 2.1.4 and introduces improved handling for projects using Vite, as well as a fix to the "What's New" notification logic. The most important changes are grouped below:

Serve Command Improvements:

• Added support for detecting and handling the serve command when Vite is used by checking for the existence of Vite and returning 'vite' as the serve command.
• Updated the changelog and package version to reflect the new version and the Vite serve command support. [1] [2]

What's New Panel Logic:

• Fixed the logic for showing the "What's New" panel by updating the last shown revision before showing the panel, ensuring the state is correctly persisted and returning early if nothing needs to be shown. [1] [2]