Jetbrains - Fix open external url

[catrielmuller]

Context

External links in the webview now properly open in the system's default browser on all platforms (macOS, Windows, Linux).

Bug discovered on the device auth change -> #4178

Implementation

• Implemented actual browser opening in the $openUri method
• Added platform-specific commands (macOS: open, Windows: start, Linux: xdg-open)
• Added constructUriString helper to build URLs from URI components
• Replaced java.awt.Desktop.getDesktop().browse() with IntelliJ Platform's BrowserUtil.browse()

How to Test

• Click on the "Open Browser" button on the DeviceAuthCard

[changeset-bot]

🦋 Changeset detected

Latest commit: a1fa747

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
kilo-code	Minor

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