Add Sign In, Register, and Sign Out to burger menu

[Copilot]

The burger menu (⋮) was missing Register for new users and the auth links were never committed/pushed to the remote branch, so the deployed app showed nothing.

Changes

• apps/web/templates/base.html
  • Unauthenticated users now see Sign in + Register in the burger dropdown
  • Authenticated users already had Sign out — no change there
  • Renamed "Sign in…" → "Sign in" (cosmetic)

{% else %}
<hr class="divider">
<a href="/login"    role="menuitem">Sign in</a>
<a href="/register" role="menuitem">Register</a>
{% endif %}

All routes (/login, /register, /logout) and the SQLite user database were already in place — this is a template-only fix.

State	Burger menu
Not logged in	About · Sign in · Register
Logged in	About · Form · Sign out

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[Copilot]

Pull request overview

This PR adds the missing "Register" link to the burger menu (⋮) for unauthenticated users and removes an ellipsis from "Sign in…" to "Sign in" for consistency. The backend routes (/login, /register, /logout) were already implemented — this is purely a template-level fix to expose registration functionality to users.

Changes:

• Added "Register" menu item for unauthenticated users alongside "Sign in"
• Changed "Sign in…" to "Sign in" for cleaner text presentation

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