fix(desktop): show every managed agent instance

[atishpatel]

Overview

Category: fix
User impact: The Agents page now shows every managed agent instance that mention autocomplete can target, even when multiple instances share the same persona and display name.

Problem: Mention autocomplete preserves managed-agent identity by pubkey, but the Agents page grouped agents by persona and selected only one representative. Multiple same-persona instances therefore appeared in autocomplete while all but one were hidden from the Agents page.

Solution:

• Render one identity card per managed-agent pubkey within each persona group.
• Show a truncated pubkey on managed cards so identically named instances are distinguishable.
• Keep persona-only cards when no managed instance exists.
• Keep persona-level edit/share/delete actions on the first stably sorted instance rather than duplicating them on every runtime card.
• Preserve relay-restored managed agents, including the ingestion path changed by Relay-primary private managed-agent config #4999.

Reproduction steps

1. Configure or restore two managed agents with the same persona ID.
2. Confirm both identities appear in mention autocomplete.
3. Open the Agents page.
4. Before this fix, only one card appeared for that persona. With this fix, both pubkey-backed cards appear and can open their respective profiles.

Validation

At commit f2a0ecff82d36525c77e0ed7a2dd978a5785cdb6 with a clean working tree:

• Pre-push desktop check, typecheck, and full unit suite passed (4,616 tests).
• Purpose-built Playwright regression passed after a fresh E2E build.
• Focused grouping tests passed (4 tests), including relay-restored and persona-only cases.
• Mutation check passed: limiting the group back to one instance made the Playwright regression fail at the two-card assertion.
• git diff --check passed.

Originating conversation: Buzz channel dcbc45d2-e9cc-45b3-940b-568dd06652ff, thread fd2e3ae323021b0314203dc0709f624669f278b344fdbe21f6cd65bae9582b2c.

Screenshot

Agents page with three managed Fizz instances sharing one persona. Each card is individually visible and distinguished by its truncated pubkey.

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