fix: currency suggestion uses region detection, seed adds market prices

- Currency auto-suggestion now uses locale region subtag (en-US → US → USD,
  en-DE → DE → EUR) instead of language prefix. Fixes wrong suggestion for
  users with English browser locale in European countries.
- Added dismiss button (X) to suggestion banner
- Dev seed script now clears existing dev data before re-seeding (safe to
  run repeatedly without manual DB cleanup)
- Added DEV_MARKET_PRICES with multi-market UVP data for 10 global items
  (EU/US/UK prices) and community prices for 5 owned items

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/db/dev-seed.ts

@@ -1,11 +1,13 @@
 // ── Dev Seed Runner ────────────────────────────────────────────────
-// Idempotent script to populate a dev database with realistic data.
+// Clears dev data and re-seeds with fresh realistic data.
 // Usage: bun run db:seed:dev
+// Preserves real (non-dev) users. Safe to run repeatedly.
 
-import { and, eq } from "drizzle-orm";
+import { and, eq, like, sql } from "drizzle-orm";
 import {
 	DEV_CATEGORIES,
 	DEV_GLOBAL_ITEMS,
+	DEV_MARKET_PRICES,
 	DEV_SETTINGS,
 	DEV_SETUPS,
 	DEV_TAG_ASSIGNMENTS,
@@ -18,19 +20,64 @@ import { seedGlobalItems } from "./seed-global-items.ts";
 
 type Db = typeof db;
 
-async function seedDevData(database: Db = db) {
-	// ── Idempotency check ──────────────────────────────────────────
-	const existing = await database
-		.select()
-		.from(schema.users)
-		.where(eq(schema.users.logtoSub, "dev-user-seed"))
-		.limit(1);
+async function clearDevData(database: Db) {
+	console.log("Clearing existing dev seed data...");
 
-	if (existing.length > 0) {
-		console.log("Dev seed data already exists, skipping.");
-		return;
+	// Find dev user(s)
+	const devUsers = await database
+		.select({ id: schema.users.id })
+		.from(schema.users)
+		.where(like(schema.users.logtoSub, "dev-user%"));
+
+	for (const user of devUsers) {
+		// Delete in FK order: setup_items → setups, thread_candidates → threads, items, categories, settings, shares
+		await database
+			.delete(schema.setupItems)
+			.where(
+				sql`${schema.setupItems.setupId} IN (SELECT id FROM setups WHERE user_id = ${user.id})`,
+			);
+		await database
+			.delete(schema.shares)
+			.where(
+				sql`${schema.shares.setupId} IN (SELECT id FROM setups WHERE user_id = ${user.id})`,
+			);
+		await database
+			.delete(schema.setups)
+			.where(eq(schema.setups.userId, user.id));
+		await database
+			.delete(schema.threadCandidates)
+			.where(
+				sql`${schema.threadCandidates.threadId} IN (SELECT id FROM threads WHERE user_id = ${user.id})`,
+			);
+		await database
+			.delete(schema.threads)
+			.where(eq(schema.threads.userId, user.id));
+		await database
+			.delete(schema.communityPrices)
+			.where(eq(schema.communityPrices.userId, user.id));
+		await database.delete(schema.items).where(eq(schema.items.userId, user.id));
+		await database
+			.delete(schema.categories)
+			.where(eq(schema.categories.userId, user.id));
+		await database
+			.delete(schema.settings)
+			.where(eq(schema.settings.userId, user.id));
+		await database.delete(schema.users).where(eq(schema.users.id, user.id));
+		console.log(`  Cleared dev user id=${user.id}`);
 	}
 
+	// Clear market prices (these are global, not user-scoped, but seeded by dev)
+	await database.delete(schema.marketPrices);
+	console.log("  Cleared market prices.");
+
+	// Global items and tags are shared — leave them (seedGlobalItems handles idempotency)
+	console.log("Dev data cleared.\n");
+}
+
+async function seedDevData(database: Db = db) {
+	// ── Clear previous dev data ────────────────────────────────────
+	await clearDevData(database);
+
 	try {
 		// ── 1. Seed global items and tags ──────────────────────────
 		await seedGlobalItems(database);
@@ -286,9 +333,50 @@ async function seedDevData(database: Db = db) {
 		}
 		console.log(`  ${DEV_SETTINGS.length} settings created.`);
 
+		// ── 12. Insert market prices ───────────────────────────────
+		let marketPriceCount = 0;
+		for (const mp of DEV_MARKET_PRICES) {
+			const giId = globalItemIds[mp.globalItemIndex];
+			if (!giId) continue;
+			await database.insert(schema.marketPrices).values({
+				globalItemId: giId,
+				market: mp.market,
+				currency: mp.currency,
+				priceCents: mp.priceCents,
+				source: mp.source,
+			});
+			marketPriceCount++;
+		}
+		console.log(`  ${marketPriceCount} market prices created.`);
+
+		// ── 13. Insert community prices ────────────────────────────
+		// Seed a few community prices from the dev user for items they own
+		const ownedGlobalItemIds = insertedItems
+			.filter((i) => i.globalItemId !== null)
+			.map((i) => i.globalItemId as number);
+
+		let communityPriceCount = 0;
+		for (const giId of ownedGlobalItemIds.slice(0, 5)) {
+			const item = insertedItems.find((i) => i.globalItemId === giId);
+			if (!item) continue;
+			await database.insert(schema.communityPrices).values({
+				globalItemId: giId,
+				userId,
+				market: "EU",
+				currency: "EUR",
+				priceCents: item.priceCents
+					? Math.round(item.priceCents * 0.85)
+					: 10000,
+				priceDate: new Date("2026-03-15"),
+				sourceType: "purchased",
+			});
+			communityPriceCount++;
+		}
+		console.log(`  ${communityPriceCount} community prices created.`);
+
 		// ── Summary ────────────────────────────────────────────────
 		console.log(
-			`\nDev seed complete: ${globalItemIds.length} global items, ${allTags.length} tags, ${insertedItems.length} user items, ${threadResults.length} threads, ${setupResults.length} setups`,
+			`\nDev seed complete: ${globalItemIds.length} global items, ${allTags.length} tags, ${insertedItems.length} user items, ${threadResults.length} threads, ${setupResults.length} setups, ${marketPriceCount} market prices`,
 		);
 	} catch (err) {
 		console.error("Seed failed:", err);