feat(renderer): display task tool summary

[sudo-tee]

No description provided.

[Copilot]

Pull request overview

Adds child-session tool activity to task tool rendering and ensures child-session tool parts are tracked and can trigger re-rendering of the owning task block.

Changes:

• Track and upsert tool parts received for child sessions, and re-render the parent task tool in the active session when child activity updates.
• Pass a child-session part fetcher into the formatter so task tools can render “live” child tool activity.
• Standardize action-line formatting (icon + label + value) and add status icons (running/pending/completed).

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/manual/renderer_replay.lua	Stabilizes replay notifications by using a consistent notify id.
tests/data/explore.expected.json	Updates expected render output to include child-session selection/action rendering.
lua/opencode/ui/renderer.lua	Stores child-session tool parts and re-renders the owning task tool part when relevant child parts update.
lua/opencode/ui/render_state.lua	Adds storage + accessors for child-session parts.
lua/opencode/ui/icons.lua	Adds icons for child-tool status rendering (completed/pending/running).
lua/opencode/ui/formatter.lua	Refactors action formatting, adds child-session activity list to task tool rendering, and wires in child-session part retrieval.

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