feat: enhance user avatar handling and synchronization with Workspace

- Updated sidebar component to merge user data from Keycloak and Workspace, including avatar URLs.
- Refactored nav-user component to utilize new avatar resolution logic and display user information more effectively.
- Introduced a new utility function to resolve user avatar URLs, prioritizing Workspace avatars.
- Implemented backend changes to support synchronization of user profile data, including avatar URLs from Workspace.
- Added database migration to include new fields for Workspace profile synchronization in user_tenants.
- Created a new client for fetching user profiles from Workspace.
- Updated dashboard components to reflect changes in user data structure and avatar handling.
- Removed avatar upload functionality from the profile update process, relying on Workspace for avatar management.
- Added tests for avatar resolution logic to ensure correct prioritization of avatar sources.

backend/alembic/versions/c3d4e5f6a7b_add_workspace_profile_fields_to_user_tenants.py

@@ -0,0 +1,56 @@
+"""add workspace profile fields to user_tenants
+
+Revision ID: c3d4e5f6a7b
+Revises: b2c3d4e5f6a7
+Create Date: 2026-05-08 00:00:00.000000
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "c3d4e5f6a7b"
+down_revision: Union[str, None] = "b2c3d4e5f6a7"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "user_tenants",
+        sa.Column(
+            "workspace_user_id",
+            sa.String(length=255),
+            nullable=True,
+            comment="User ID (sub) proveniente de Workspace",
+        ),
+        schema="core",
+    )
+    op.add_column(
+        "user_tenants",
+        sa.Column(
+            "workspace_avatar_url",
+            sa.String(length=500),
+            nullable=True,
+            comment="Avatar URL sincronizado desde Workspace",
+        ),
+        schema="core",
+    )
+    op.add_column(
+        "user_tenants",
+        sa.Column(
+            "workspace_profile_synced_at",
+            sa.DateTime(timezone=True),
+            nullable=True,
+            comment="Última sincronización de perfil con Workspace",
+        ),
+        schema="core",
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("user_tenants", "workspace_profile_synced_at", schema="core")
+    op.drop_column("user_tenants", "workspace_avatar_url", schema="core")
+    op.drop_column("user_tenants", "workspace_user_id", schema="core")