Add Microsoft Store install source to nickknissen.tailscale-command-palette

[nickknissen]

Extension Submission

Updates the existing nickknissen.tailscale-command-palette entry — the extension is now published to the Microsoft Store, so this PR adds an msstore install source alongside the existing winget and url sources.

• Store listing: https://apps.microsoft.com/detail/9N5NWRQ9FBLM
• Repo: https://github.com/nickknissen/TailscaleCommandPalette

Checklist

• My folder follows the <author>/<extension-name> convention (lowercase, alphanumeric + hyphens only)
• I have added an extension.json with all required fields
• The id field in my extension.json matches my folder path (author.extension-name)
• I have added an icon file (PNG or JPG, under 100 KB)
• The icon field in extension.json matches my icon filename
• My extension is available at the install source I specified (winget/MS Store/URL)
• I have read the Contributing Guide

Additional context

No icon, screenshots, or metadata changes — just the new msstore install source.

[Copilot]

Pull request overview

Adds a Microsoft Store install source to the existing nickknissen.tailscale-command-palette extension entry so users can install it via the Store in addition to winget and direct URL.

Changes:

• Added an msstore entry (product ID 9N5NWRQ9FBLM) to installSources alongside existing winget and url sources.

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