- Replaces the flat agent dropdown in the "Create with agent" modal with a
searchable PropertyPicker that lists Agents and Squads in separate
sections, so users can filter by name and pick a squad as the creator.
- Persists the selection as (lastActorType, lastActorId), removing the
agent-only lastAgentId field on the quick-create store.
- Adds squad_id to the quick-create API request and stamps it onto the
task's QuickCreateContext. The handler resolves the squad to its leader
agent (re-using validateAssigneePair) and the daemon claim path injects
the squad-leader briefing when the task carries a squad hint, matching
the behavior of issue-bound squad tasks.
Co-authored-by: multica-agent <github@multica.ai>
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