feat(profile): embed live activity feed in profile aux panel

[tellaho]

Summary

Stacked on PR-3 (the activity-feed rebuild). When a managed agent is live, the Profile auxiliary panel replaces the static "Activity log → View" ingress row with an embedded live activity feed (h-48, ~192px). Clicking the embed — or pressing Enter/Space — opens the existing full activity view. When the agent is idle, the original ingress row is shown unchanged.

What changed

• Replaces the Profile Info Activity log → View ingress with an embedded h-48 live feed when useActiveAgentTurns reports the agent is live.
• Reuses the PR-3 ManagedAgentSessionPanel / AgentSessionTranscriptList components (same feed, height-constrained).
• Embedded live feed supports optional transcript auto-tail.
• Multi-channel: the embed scopes to one active channel; if the agent is working across several, a small #channel pill switcher swaps the feed (via channelId into ManagedAgentSessionPanel). Falls back to the next active channel if the selected one goes idle.

Checks (Bart, in-worktree)

• pnpm exec biome check ✅
• pnpm typecheck ✅
• pnpm test ✅
• pnpm check:file-sizes && pnpm check:px-text ✅
• Pre-push hooks: desktop-test, rust-tests, desktop-tauri-test, mobile-test ✅

Notes

• Draft — stacked on tho/activity-feed-rebuild; base will retarget to main once PR-3 lands. Review of the rebuilt feed itself belongs in PR-3.
• Commits: c1de233b (embed), 6a52216d (per-channel scoping + switcher).

Co-authored-by: Taylor Ho taylorkmho@gmail.com
Signed-off-by: Taylor Ho taylorkmho@gmail.com