ProjectBoxData replaces Entity<ProjectBox>. Workspace is the only view
entity in the dispatch tree. Timer notifies Workspace via cx.spawn.
12 optimization iterations: 90% → 2.17% CPU for a pulsing dot.
- Sidebar and StatusBar uncached (natural size collapsed with StyleRefinement::default)
- ProjectGrid cached with flex-1 style (into_cached_flex)
- AgentPane + TerminalView cached within ProjectBox
- BlinkState::start() fixed with &mut *cx deref coercion
- CPU: ~3% with full layout visible (down from 6.8% uncached)
- Remaining: ProjectBox re-renders full tree on blink (reads BlinkState)
- Next: isolate dot into StatusDotView entity to prevent ProjectBox re-render
