style(ui): polimento visual — tema, cards, dark mode e landing page

Raio de borda global 0.625rem → 0.7rem; ajustes finos em --card e --border.
DotPattern removido do layout, tela de auth e landing page.
Account-card redesenhado (cores de saldo, tooltip de flags de exclusão).
Budget-card, card-item, calendário (day-cell, event-modal) com layout revisado.
Auth-card-shell simplificado (sem glassmorphism/blob). Landing page com
mainFeatures + extraFeatures em grid único e dark mode nos botões de CTA.
Imagens de preview da landing atualizadas. CSS --data-7..10 removidas.

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

src/app/(dashboard)/budgets/page.tsx

@@ -20,22 +20,13 @@ const getSingleParam = (
 	return Array.isArray(value) ? (value[0] ?? null) : value;
 };
 
-const capitalize = (value: string) =>
-	value.length === 0 ? value : value[0]?.toUpperCase() + value.slice(1);
-
 export default async function Page({ searchParams }: PageProps) {
 	await connection();
 	const userId = await getUserId();
 	const resolvedSearchParams = searchParams ? await searchParams : undefined;
 	const periodoParam = getSingleParam(resolvedSearchParams, "periodo");
 
-	const {
-		period: selectedPeriod,
-		monthName: rawMonthName,
-		year,
-	} = parsePeriodParam(periodoParam);
-
-	const periodLabel = `${capitalize(rawMonthName)} ${year}`;
+	const { period: selectedPeriod } = parsePeriodParam(periodoParam);
 
 	const { budgets, categoriesOptions } = await fetchBudgetsForUser(
 		userId,
@@ -49,7 +40,6 @@ export default async function Page({ searchParams }: PageProps) {
 				budgets={budgets}
 				categories={categoriesOptions}
 				selectedPeriod={selectedPeriod}
-				periodLabel={periodLabel}
 			/>
 		</main>
 	);