Duplicate "Join" button on group detail page (left of avatar should be removed)

**What happens:** On the group detail page, two "Join" buttons appear: 1. A small **"Join"** pill below the group avatar on the left side of the page 2. The main **"Join Ring"** button on the right side of the page header The small left-side "Join" button is a duplicate / orphan and shouldn't be there. **Expected:** only one Join button — the main one on the right side of the page header. The small "Join" pill below the avatar should be removed. **Where:** group detail page (`/organizations/{org}/groups/{group}` or equivalent route). Visible on the "South Team" group under Montreal Tech Community in the screenshot. **Repro:** 1. Sign in as a user who is NOT a member of the group. 2. Navigate to any group detail page (e.g. South Team). 3. Observe: small "Join" button under the avatar on the left + main "Join" button on the right. 4. Both render simultaneously.