docs: specify required web login

docs/superpowers/specs/2026-05-06-require-web-login-design.md

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+# Require Web Login Design
+
+## Goal
+
+When a user opens the self-hosted Hoppscotch web frontend without an active
+session, the app must not be usable. The user should see only a login page
+until authentication succeeds.
+
+## Scope
+
+- Applies only to the web shell in `packages/hoppscotch-selfhost-web`.
+- Does not change the desktop shell behavior.
+- Does not change backend authentication endpoints or session semantics.
+- Reuses the existing Hoppscotch auth platform and login UI.
+
+## Architecture
+
+The self-hosted web platform will register a root UI extension that acts as an
+auth gate. The gate will subscribe to the existing `platform.auth` user stream
+and render above the app only when the current platform is web and no confirmed
+user exists.
+
+The gate has three visible states:
+
+- Auth check pending: show a centered spinner while `performAuthInit()` verifies
+  the cookie-backed session.
+- Anonymous: show a full-screen login-only page using the existing
+  `FirebaseLogin` component.
+- Authenticated: render nothing, allowing the normal Hoppscotch app to remain
+  usable.
+
+## Data Flow
+
+`performAuthInit()` already checks the backend session and updates
+`currentUser$`. The auth gate must not perform its own token or cookie checks.
+It only observes the existing stream, so login, logout, refresh, and local auth
+continue to use the current implementation.
+
+## Route Behavior
+
+The gate blocks interaction with normal app routes by covering the UI, not by
+redirecting. This avoids changing common router behavior and avoids breaking
+special routes such as `/enter` and `/device-login`, which use the `empty`
+layout and are outside the normal application shell.
+
+## Testing
+
+Add a focused unit test for the gate state logic:
+
+- pending auth check requires the blocking screen;
+- anonymous confirmed state requires the blocking screen;
+- authenticated state does not block;
+- desktop platform does not block.
+
+Run the targeted test and a typecheck or lint command for the touched package.