Faster warm paths and honest numbers for Usage and Overview

Usage tab: read rollout tails for the codex quota, not whole files

Progressive loading for the Overview and Usage pages

Decouple names from folders (explicit paths + folder picker, visual-only groups), pin Codex conversations, fix drag-into-group, async usage, WS origin check, secrets filter

Usage: revert to statusline snapshot; drop refresh/live widgets and cost estimate

Claude quota: live /api/oauth/usage (no inference), statusline snapshot as fallback

Public template: auto-locks at runtime, shows duplicate-to-private widget