[Story] FEAT-USER-GROUPS-10: My Groups View (account area)

[sven1103-agent]

Parent Feature

#1558

User Story

As a user, I want a "My Groups" view in my account area showing the groups I belong to and my
role, with manager/owner controls, so that I can manage my ad-hoc groups and see my group
memberships in one place.

Acceptance Criteria

• Given I open My Groups, When my memberships are listed, Then each group shows name, description,
  and my internal role; groups without membership do not appear.
• Given I am an owner of an ad-hoc group, When I use My Groups, Then I can appoint managers,
  add/remove members, rename, and dissolve (with confirmation).
• Given I am a manager, When I use My Groups, Then I can add/remove members and rename/describe the
  group; I cannot appoint managers or dissolve.
• Given I am a plain member, When I use My Groups, Then I can self-remove but perform no management
  actions.
• Given the group is an org group I belong to, When I view it in My Groups, Then I see
  membership-only actions appropriate to my role (no owner-equivalent admin controls).

Requirement IDs: GROUP-R-05, GROUP-R-03, GROUP-R-02, GROUP-R-04

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Tracking

• Epic: EPIC 5 — UI surfaces
• Stable Story ID: FEAT-USER-GROUPS-10
• Source: docs/features/FEAT-USER-GROUPS-stories.md — PO-approved (2026-09-22)