fix(cursor): hide Task subagent sessions from sidebar by default

[joostfaassen]

Summary

• Cursor Task/subagent transcripts were indexed as peer sidebar sessions (unlike Claude/Codex, which already skip them).
• This marks Cursor subagents via is_subagent + parent_session_id (classic …/subagents/ paths and store.db agentId links from parent Task results).
• Default project/session lists exclude subagents; Quick Settings adds Show subagent sessions.
• Parent chat Task blocks get an Open transcript link; subagent history falls back to agent-transcripts JSONL when store.db is missing.

Test plan

• Start a Cursor session that launches Task/subagents
• Confirm child sessions do not appear in the left sidebar by default
• Enable Quick Settings → Show subagent sessions → children appear with a sub badge
• Open parent session → Task block → Open transcript navigates to the child session
• Direct /session/<subagent-uuid> still works when hidden from the sidebar
• Claude/Codex sidebar behaviour unchanged

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