Add green-bean inventory and cupping features

Ports inventory management and SCA-style cupping scoring from
hope_roaster: lot tracking with audit-logged consumption, cupping
sessions with server-authoritative scoring and a live radar chart,
and links from the planner (draw-from-lot, open-cupping-session).

Also fixes the Blend/Single-origin toggle layout, replaces tooltips
with an in-context "why" teaching layer, and stages the planner UI
into pre-roast vs. post-roast phases.

server/db.js

@@ -13,7 +13,11 @@ export function createDb(connectionString = process.env.DATABASE_URL) {
 				? { rejectUnauthorized: true }
 				: undefined,
 	});
-	return { query: (...args) => pool.query(...args), close: () => pool.end() };
+	return {
+		query: (...args) => pool.query(...args),
+		connect: () => pool.connect(),
+		close: () => pool.end(),
+	};
 }
 
 /** Apply each versioned SQL file once; failed migrations are not recorded. */