Sidebar: Spaces tree with lazy-expand to projects on caret click; bottom
Navigate section with Sacred Valley / Search / Inbox + placeholders for
Agents and Resources greyed out as later. Inbox item carries a
pending-count badge that wires to state.js so the topbar bell and the
sidebar share one poll.
Topbar: brand, + Capture button (modal stub for Plan 3 capture queue),
global search input (Enter -> /search?q=), pending Inbox bell with
matching badge, Owner toggle (stub for agent-switching post-Plan-2).
Rightrail remains the T17 collapsible companion placeholder.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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