refactor: migrate from ESLint to Biome and extract SQL queries to data.ts

- Replace ESLint with Biome for linting and formatting
- Configure Biome with tabs, double quotes, and organized imports
- Move all SQL/Drizzle queries from page.tsx files to data.ts files
- Create new data.ts files for: ajustes, dashboard, relatorios/categorias
- Update existing data.ts files: extrato, fatura (add lancamentos queries)
- Remove all drizzle-orm imports from page.tsx files
- Update README.md with new tooling info

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/(dashboard)/dashboard/data.ts

@@ -0,0 +1,25 @@
+import { eq } from "drizzle-orm";
+import { db, schema } from "@/lib/db";
+
+export interface UserDashboardPreferences {
+	disableMagnetlines: boolean;
+	dashboardWidgets: string | null;
+}
+
+export async function fetchUserDashboardPreferences(
+	userId: string,
+): Promise<UserDashboardPreferences> {
+	const result = await db
+		.select({
+			disableMagnetlines: schema.userPreferences.disableMagnetlines,
+			dashboardWidgets: schema.userPreferences.dashboardWidgets,
+		})
+		.from(schema.userPreferences)
+		.where(eq(schema.userPreferences.userId, userId))
+		.limit(1);
+
+	return {
+		disableMagnetlines: result[0]?.disableMagnetlines ?? false,
+		dashboardWidgets: result[0]?.dashboardWidgets ?? null,
+	};
+}