feat: allow editing user profile settings

docs/FEATURES/user-profile-settings.md

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+# Feature: User Profile Settings
+
+## Status
+
+Draft
+
+## Goal
+
+Allow authenticated users to manage the profile information shown inside the application shell and workspace activity.
+
+## User Stories
+
+- As an authenticated user, I want to update my name, alias, email, and portrait so that other workspace members see accurate profile information.
+
+## Frontend Areas
+
+- `/app/settings/user-information`
+- `frontend/src/features/user-profile/`
+
+## Backend Modules
+
+- Identity
+
+## Domain Rules
+
+- Profile updates apply only to the authenticated user.
+- Portrait uploads flow through the existing blob storage abstraction.
+- Email changes use the identity module endpoint and should remain auditable through backend identity behavior.
+
+## Done When
+
+- [ ] User information settings show editable name, alias, and email fields.
+- [ ] Portrait upload remains available from the settings page.
+- [ ] Successful updates refresh the user profile state used by the app shell.