[BUG] Self-inviting to workspace demotes owner to Member role

Description

When a workspace owner invites themselves (using their own email address) to their own workspace, their role is silently downgraded from Admin to Member. This causes a complete loss of workspace management capabilities with no way to recover through the UI.

Steps to Reproduce

1. Create a workspace as admin
2. Navigate to workspace settings and invite a new member using your own email address (the same email associated with your account)
3. Accept the invitation
4. Check your role in the workspace

Expected Behavior

• The self-invite should be rejected (owner is already a member), OR
• The owner's Admin role should remain unchanged after accepting

Actual Behavior

• Owner's role is silently changed from "Admin" to "Member"
• Owner can no longer manage the workspace (add/remove members, change settings, etc.)
• No UI option to recover admin privileges

Impact

This is a critical issue. The workspace owner completely loses administrative control with no self-service recovery path. The only recourse is contacting support.

Environment

• Platform: OpenCode Zen (opencode.ai)
• Feature: Workspace member management

Result Captured

While correct result should be like:

The second capture is missing. The correct behavior should be a "Turn off subscribe" button displayed in the top-right corner.

Plugins

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OpenCode version

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Steps to reproduce

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Screenshot and/or share link

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Operating System

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Terminal

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