Implement Phase 8: Dashboard & Reports (v0.8.0)

- Add comprehensive admin dashboard with stat cards and widgets
- Add Chart.js for occupancy/revenue trend charts
- Add Reports page with Occupancy, Revenue, Guest tabs
- Add CSV and PDF export functionality (using mPDF)
- Add date range filters for reports

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

CHANGELOG.md

@@ -5,6 +5,39 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.8.0] - 2026-02-03
+
+### Added
+
+- Admin Dashboard with comprehensive statistics:
+  - Occupancy overview card with current rate and comparison to last month
+  - Revenue summary card with this month, YTD, and comparison
+  - Bookings stat card with pending/confirmed counts
+  - Guests stat card with total, new, and repeat counts
+  - Today's Activity widget showing check-ins and check-outs
+  - Upcoming Bookings widget (next 7 days)
+  - Quick Actions widget for common tasks
+  - Chart.js integration for visual trend charts:
+    - Occupancy trend line chart (30 days)
+    - Revenue trend bar chart (6 months)
+- Reports page with three report types:
+  - Occupancy Report: by room, by building, with progress bars
+  - Revenue Report: by room, by pricing tier, with averages
+  - Guest Statistics: top guests, nationality breakdown
+  - Date range filters (this month, last month, this year, custom)
+- Export functionality:
+  - CSV export for all report types (native PHP)
+  - PDF export using mPDF library with professional styling
+- New Composer dependency: mpdf/mpdf ^8.2 for PDF generation
+- Dashboard and Reports CSS styles in admin.css (~350 lines)
+- JavaScript chart initialization and report page handlers
+
+### Changed
+
+- Dashboard now uses dedicated `src/Admin/Dashboard.php` class
+- Admin menu now includes Reports submenu item
+- Asset enqueuing conditionally loads Chart.js on dashboard page
+
 ## [0.7.2] - 2026-02-03
 
 ### Fixed