[Init] Initial commit - NetMesh terminal manager

application/state/useManualTerminalChromeSurfaceInjection.ts

@@ -0,0 +1,28 @@
+import { useLayoutEffect, useRef } from 'react';
+
+import type { TerminalTheme } from '../../domain/models';
+import { applyTopTabsChromeThemeVars } from '../app/topTabsChromeTheme';
+import {
+  clearTerminalLayerChromeSurfaceVars,
+  injectTerminalLayerChromeSurfaceVars,
+} from '../../infrastructure/theme/terminalAppearanceVars';
+
+/** Manual mode: side panel + host tree follow the focused session theme, not the global default. */
+export function useManualTerminalChromeSurfaceInjection(
+  theme: TerminalTheme,
+  enabled: boolean,
+): void {
+  const prevEnabledRef = useRef(enabled);
+  useLayoutEffect(() => {
+    const wasEnabled = prevEnabledRef.current;
+    prevEnabledRef.current = enabled;
+    if (enabled) {
+      injectTerminalLayerChromeSurfaceVars(theme);
+      applyTopTabsChromeThemeVars(theme);
+      return;
+    }
+    if (wasEnabled) {
+      clearTerminalLayerChromeSurfaceVars();
+    }
+  }, [enabled, theme.id, theme]);
+}