Persistently store hash in session storage to preserve it across oauth

[ar2rsawseen]

No description provided.

[Copilot]

Pull request overview

This PR implements functionality to preserve URL hash fragments across OAuth2 authentication flows by storing them in sessionStorage during login and restoring them after successful authentication on the dashboard.

Key Changes:

• Added hash preservation logic to the login page that stores URL hash in sessionStorage before OAuth redirect
• Added hash restoration logic to the dashboard page that retrieves and applies the saved hash after OAuth authentication completes

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
frontend/express/views/login.html	Captures and stores URL hash in sessionStorage when login page loads to preserve it through OAuth flow
frontend/express/views/dashboard.html	Retrieves stored hash from sessionStorage and restores it to the URL after OAuth authentication, then cleans up the stored value

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