Initial build: SaaS Cost Predictor Chrome extension MVP

src/types.ts

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+export interface Subscription {
+  id: string;
+  name: string;
+  cost: number;
+  billingCycle: 'monthly' | 'yearly' | 'weekly';
+  category: string;
+  url?: string;
+  createdAt: string;
+  history: CostHistoryPoint[];
+}
+
+export interface CostHistoryPoint {
+  date: string;
+  amount: number;
+}
+
+export interface Budget {
+  monthlyLimit: number;
+  alertThreshold: number;
+}
+
+export interface ForecastResult {
+  nextMonthForecast: number;
+  trendDirection: 'up' | 'down' | 'stable';
+  trendPercent: number;
+  confidence: 'high' | 'medium' | 'low';
+  breakdown: CategoryBreakdown[];
+  alertTriggered: boolean;
+  alertMessage?: string;
+}
+
+export interface CategoryBreakdown {
+  category: string;
+  currentSpend: number;
+  forecastSpend: number;
+  percentOfTotal: number;
+}
+
+export interface AppState {
+  subscriptions: Subscription[];
+  budget: Budget;
+}