Redirect to landing page when unsupported page is visited directly.

[sea-snake]

Redirect to landing page when this page is visited directly. Reloading the unsupported page either manually or automatically due to inactivity, does not result in a redirect.

Changes

• Updated unsupported page with beforeNavigate and afterNavigate hooks.

Tests

Manually verified the page behaves as expected, visiting /#authorize still redirects to /unsupported and is out of scope for this PR.

[Copilot]

Pull request overview

This PR implements redirect logic for the unsupported browser page to prevent users from accessing it directly via URL while still allowing access after internal navigation and page reloads. The implementation uses SvelteKit's navigation lifecycle hooks combined with sessionStorage to track the navigation context.

Key changes:

• Adds beforeNavigate hook to detect when users leave the page (including reloads) and sets a sessionStorage flag
• Adds afterNavigate hook to check if the page was entered directly or after a reload, redirecting direct visits to the landing page
• Uses sessionStorage with a cleanup mechanism to track reload state across page loads

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