refactor: simplify Phase 1 infrastructure code

- cache-invalidation: extract isExpectedRevalidateError helper
- integration-data-cache: flatten early-return chain, extract eviction
- redis-handler: extract StoredEntry type, readStreamBody, ensureConnected
- svg-purify: single getOwnPropertyDescriptor lookup per prop
- session-scoped-providers: simplify auth flow
- retryable-loader: use function declarations
- translation/request: replace spread-in-reduce with for loop

apps/nextjs/src/app/[locale]/_session-scoped-providers.tsx

@@ -24,16 +24,17 @@ import { composeWrappers } from "./compose";
 const logger = createLogger({ module: "sessionScopedProviders" });
 
 export async function SessionScopedProviders({ children }: PropsWithChildren) {
-  const sessionPromise = auth();
-  const userPromise = sessionPromise.then((session) =>
+  const session = await auth();
+
+  const [user, serverSettings] = await Promise.all([
     session
       ? getRscUserSettingsAsync(session.user.id).catch((error: unknown) => {
           logger.error(new Error("Failed to load the authenticated user in the root layout", { cause: error }));
           return null;
         })
-      : null,
-  );
-  const [session, user, serverSettings] = await Promise.all([sessionPromise, userPromise, getRscServerSettingsAsync()]);
+      : Promise.resolve(null),
+    getRscServerSettingsAsync(),
+  ]);
 
   const StackedProvider = composeWrappers([
     (innerProps) => <AuthProvider session={session} logoutUrl={env.AUTH_LOGOUT_REDIRECT_URL} {...innerProps} />,

apps/nextjs/src/app/api/user-medias/sanitize.spec.ts

@@ -68,7 +68,8 @@ describe("SVG sanitization", () => {
   });
 
   it("preserves well-formed SVG with self-closing children", () => {
-    const icon = '<svg viewBox="0 0 24 24"><path d="M12 2L2 22h20Z" fill="currentColor"/><circle cx="12" cy="8" r="2"/></svg>';
+    const icon =
+      '<svg viewBox="0 0 24 24"><path d="M12 2L2 22h20Z" fill="currentColor"/><circle cx="12" cy="8" r="2"/></svg>';
     const clean = sanitizeSvg(icon);
     expect(clean).toContain("<path");
     expect(clean).toContain("<circle");

apps/nextjs/src/app/api/user-medias/svg-purify.ts

@@ -6,24 +6,25 @@ const svgSanitizeOptions = {
   FORBID_TAGS: ["style"],
 } as const;
 
+const LINKEDOM_NODE_PROPS = [
+  "ownerDocument",
+  "parentNode",
+  "nextSibling",
+  "previousSibling",
+  "nodeName",
+  "nodeType",
+  "childNodes",
+] as const;
+
 // ponytail: linkedom stores DOM tree pointers as own value properties; DOMPurify
 // resolves them via prototype getters (lookupGetter). Without this shim, sanitize
 // is a no-op and XSS payloads pass through unchanged.
 const patchLinkedomNodePrototype = (Node: typeof window.Node) => {
-  for (const prop of [
-    "ownerDocument",
-    "parentNode",
-    "nextSibling",
-    "previousSibling",
-    "nodeName",
-    "nodeType",
-    "childNodes",
-  ] as const) {
-    if (Object.getOwnPropertyDescriptor(Node.prototype, prop)?.get) {
-      continue;
-    }
+  for (const prop of LINKEDOM_NODE_PROPS) {
+    const descriptor = Object.getOwnPropertyDescriptor(Node.prototype, prop);
+    if (descriptor?.get) continue;
 
-    if (Object.getOwnPropertyDescriptor(Node.prototype, prop)?.value !== undefined) {
+    if (descriptor?.value !== undefined) {
       delete Node.prototype[prop as keyof Node];
     }