Adds visitor dashboard and related features

src/app/interfaces/visitor-stat.ts

@@ -0,0 +1,29 @@
+export interface StatsSummary {
+  total_unique_visitors: number;
+}
+
+export interface TimeSeriesPoint {
+  date: string;
+  unique_visitors: number;
+}
+
+export interface GeoStat {
+  country: string;
+  country_code: string;
+  latitude: number | null;
+  longitude: number | null;
+  visitors: number;
+}
+
+export interface ParseProgress {
+  file: string;
+  current: number;
+  total: number;
+}
+
+export interface ParseResult {
+  files_processed: number;
+  rows_inserted: number;
+}
+
+export type TimePreset = 'yesterday' | '7d' | '30d' | '90d' | 'year' | 'custom';