perf(ui-gpui): diagnostic counters confirm 2 renders/sec at window level (GPUI limit)

- 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

ui-gpui/src/workspace.rs

@@ -85,34 +85,23 @@ impl Render for Workspace {
             .flex_row()
             .overflow_hidden();
 
-        // Sidebar (icon rail) — cached: only re-renders when sidebar entity is notified
+        // Sidebar (icon rail) — uncached (tiny, cheap to render)
         if sidebar_open {
-            main_row = main_row.child(
-                self.sidebar.clone().into_cached_view(),
-            );
+            main_row = main_row.child(self.sidebar.clone());
         }
 
-        // Settings drawer (between sidebar and grid) — cached
+        // Settings drawer (between sidebar and grid)
         if settings_open {
-            main_row = main_row.child(
-                self.settings_panel.clone().into_cached_view(),
-            );
+            main_row = main_row.child(self.settings_panel.clone());
         }
 
-        // Project grid (fills remaining space) — cached: only re-renders when grid entity is notified
-        main_row = main_row.child(
-            div()
-                .flex_1()
-                .h_full()
-                .child(self.project_grid.clone().into_cached_view()),
-        );
+        // Project grid (fills remaining space) — cached with flex-1
+        main_row = main_row.child(self.project_grid.clone().into_cached_flex());
 
         root = root.child(main_row);
 
-        // ── Status bar (bottom) — cached: only re-renders on status change
-        root = root.child(
-            self.status_bar.clone().into_cached_view(),
-        );
+        // Status bar (bottom) — uncached (tiny, cheap to render)
+        root = root.child(self.status_bar.clone());
 
         // ── Command palette overlay (if open) ───────────────
         if palette_open {