perf(ui): trim hidden session and bootstrap work

packages/ui/src/lib/ui-bootstrap-cache.ts

@@ -0,0 +1,48 @@
+export type UiBootstrapTheme = "light" | "dark" | "system"
+
+export interface UiBootstrapCacheSnapshot {
+  theme?: UiBootstrapTheme
+  locale?: string
+}
+
+const UI_BOOTSTRAP_CACHE_KEY = "codenomad:ui-bootstrap"
+
+export function readUiBootstrapCache(): UiBootstrapCacheSnapshot {
+  if (typeof window === "undefined" || typeof window.localStorage === "undefined") {
+    return {}
+  }
+
+  try {
+    const raw = window.localStorage.getItem(UI_BOOTSTRAP_CACHE_KEY)
+    if (!raw) {
+      return {}
+    }
+
+    const parsed = JSON.parse(raw) as UiBootstrapCacheSnapshot
+    if (!parsed || typeof parsed !== "object") {
+      return {}
+    }
+
+    return {
+      theme:
+        parsed.theme === "light" || parsed.theme === "dark" || parsed.theme === "system"
+          ? parsed.theme
+          : undefined,
+      locale: typeof parsed.locale === "string" ? parsed.locale : undefined,
+    }
+  } catch {
+    return {}
+  }
+}
+
+export function writeUiBootstrapCache(snapshot: UiBootstrapCacheSnapshot) {
+  if (typeof window === "undefined" || typeof window.localStorage === "undefined") {
+    return
+  }
+
+  try {
+    window.localStorage.setItem(UI_BOOTSTRAP_CACHE_KEY, JSON.stringify(snapshot))
+  } catch {
+    /* noop */
+  }
+}