[feature] Share and manage subscriptions across multiple profiles

Users may want to manage subscriptions across different contexts such as personal, shared (e.g. with a partner), or business.

Currently, there is no easy way to group and share subscriptions between people or profiles.

Goal:

• Allow users to create multiple profiles (e.g. Personal, Family, Business)

• Enable sharing a profile with another user

• Keep subscriptions organized and separated by profile

• Allow easy switching between profiles