replace localStorage with pglite for persistent data, force-add previously ignored lib/ files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/features/feed/lib/feed-cache.ts

@@ -0,0 +1,33 @@
+import { clearCachedFeed, loadCachedFeed, saveCachedFeed } from "@/shared/db/feed-cache-db"
+import type { PGlite } from "@electric-sql/pglite"
+import type { FeedItem } from "./assemble-feed"
+
+export interface FeedCacheData {
+	items: FeedItem[]
+	updatedAt: number
+}
+
+export async function loadFeedCache(db: PGlite): Promise<FeedCacheData | null> {
+	return loadCachedFeed(db)
+}
+
+export async function saveFeedCache(db: PGlite, items: FeedItem[]): Promise<void> {
+	await saveCachedFeed(db, items)
+}
+
+export async function clearFeedCache(db: PGlite): Promise<void> {
+	await clearCachedFeed(db)
+}
+
+export function mergeFeedItems(cached: FeedItem[], fresh: FeedItem[]): FeedItem[] {
+	const map = new Map<string, FeedItem>()
+	for (const item of cached) map.set(item.id, item)
+	for (const item of fresh) map.set(item.id, item)
+
+	return Array.from(map.values()).sort((a, b) => {
+		if (a.date && b.date) return b.date.localeCompare(a.date)
+		if (!a.date && b.date) return 1
+		if (a.date && !b.date) return -1
+		return a.title.localeCompare(b.title)
+	})
+}