refactor: migrate to monorepo structure with Docker, PocketBase, and e2e tests

- Reorganize into apps/, packages/, docs/, e2e/, pocketbase/ directories
- Add Dockerfiles for web, worker, and PocketBase services
- Add docker-compose.yml for local orchestration
- Add turbo.json for monorepo task management
- Add Playwright e2e test infrastructure
- Add PocketBase backend with migrations
- Remove Vite/Next.js/ESLint/PostCSS config files
- Update package.json with workspace dependencies
- Add .env.example and .dockerignore

apps/web/types/react-calendar-heatmap.d.ts

@@ -0,0 +1,35 @@
+declare module 'react-calendar-heatmap' {
+  import { ComponentType } from 'react';
+
+  interface HeatmapValue {
+    date: Date | string;
+    count: number;
+  }
+
+  interface ReactCalendarHeatmapProps {
+    startDate: Date | string;
+    endDate: Date | string;
+    values: HeatmapValue[];
+    classForValue?: (value: HeatmapValue | null) => string;
+    tooltipDataAttrs?: (value: HeatmapValue | null) => Record<string, string | number> | null;
+    showWeekdayLabels?: boolean;
+    showMonthLabels?: boolean;
+    showOutOfRangeDays?: boolean;
+    numDays?: number;
+    gutterSize?: number;
+    horizontal?: boolean;
+    transformDayElement?: (
+      element: JSX.Element,
+      value: HeatmapValue | null,
+      index: number
+    ) => JSX.Element;
+    monthLabels?: string[] | Record<string, string>;
+    weekdayLabels?: string[];
+    onClick?: (value: HeatmapValue | null) => void;
+    onMouseOver?: (value: HeatmapValue | null, event: React.MouseEvent) => void;
+    onMouseLeave?: (value: HeatmapValue | null, event: React.MouseEvent) => void;
+  }
+
+  const CalendarHeatmap: ComponentType<ReactCalendarHeatmapProps>;
+  export default CalendarHeatmap;
+}