Add pricing system with tiers, seasons, and calculator (v0.2.0)

- Create PricingTier enum for short/mid/long-term pricing
- Add Season class for seasonal pricing with date ranges
- Implement Calculator for price calculations with breakdown
- Add pricing meta box to Room post type
- Create Seasons admin page for managing seasonal pricing
- Add Pricing settings tab with tier thresholds
- Support weekend surcharges and configurable weekend days
- Add price column to room list admin

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

CLAUDE.md

@@ -38,15 +38,6 @@ This project is proudly **"vibe-coded"** using Claude.AI - the entire codebase w
 
 **Note for AI Assistants:** Clean this section after the specific features are done or new releases are made. Effective changes are tracked in `CHANGELOG.md`. Do not add completed versions here - document them in the Session History section at the end of this file.
 
-### Version 0.1.0 - Core Data Structures
-
-- Custom Post Type: Buildings (address, contact, description, images)
-- Custom Post Type: Rooms (building reference, capacity, amenities)
-- Custom Taxonomy: Room Types (Standard, Suite, Family, etc.)
-- Custom Taxonomy: Amenities (WiFi, Parking, Breakfast, etc.)
-- Gutenberg blocks for Buildings and Rooms
-- See `PLAN.md` for full implementation roadmap
-
 ## Technical Stack
 
 - **Language:** PHP 8.3.x
@@ -215,11 +206,17 @@ wp-bnb/
 │       └── release.yml     # CI/CD release pipeline
 ├── src/                    # PHP source code (PSR-4: Magdev\WpBnb)
 │   ├── Plugin.php          # Main plugin singleton
+│   ├── Admin/              # Admin pages
+│   │   └── Seasons.php     # Seasons management page
 │   ├── License/
 │   │   └── Manager.php     # License management
 │   ├── PostTypes/          # Custom post types
 │   │   ├── Building.php    # Building post type
 │   │   └── Room.php        # Room post type
+│   ├── Pricing/            # Pricing system
+│   │   ├── Calculator.php  # Price calculation
+│   │   ├── PricingTier.php # Pricing tier enum
+│   │   └── Season.php      # Seasonal pricing
 │   └── Taxonomies/         # Custom taxonomies
 │       ├── Amenity.php     # Amenity taxonomy (tags)
 │       └── RoomType.php    # Room type taxonomy (categories)
@@ -350,3 +347,53 @@ Admin features always work; frontend requires valid license.
 - Gallery implementation uses `wp.media` frame with multiple selection
 - Admin assets need conditional loading based on both hook suffix and post type
 - Status badges use inline styles for color coding (avoiding extra CSS complexity)
+
+### 2026-01-31 - Version 0.2.0 (Pricing System)
+
+**Completed:**
+
+- Created `src/Pricing/PricingTier.php` enum class
+  - SHORT_TERM, MID_TERM, LONG_TERM cases
+  - Labels, units, default thresholds
+  - `fromNights()` for automatic tier detection
+- Created `src/Pricing/Season.php` class
+  - Seasonal pricing with date ranges (MM-DD format)
+  - Year-spanning seasons support (e.g., Dec 20 to Jan 6)
+  - Price modifier (multiplier) per season
+  - Priority system for overlapping seasons
+  - CRUD operations stored in wp_options
+  - Default seasons: High Season, Winter Holidays, Low Season
+- Created `src/Pricing/Calculator.php` class
+  - Price calculation with tier detection
+  - Seasonal modifier application
+  - Weekend surcharge support
+  - Detailed price breakdown
+  - Currency formatting with symbol/suffix
+- Added pricing meta box to Room post type
+  - Base prices for each tier
+  - Weekend surcharge field
+  - Link to pricing settings
+  - Price column in admin list
+- Added Pricing tab to settings page
+  - Configurable tier thresholds
+  - Weekend days selection (checkboxes)
+  - Quick view of configured seasons
+- Created `src/Admin/Seasons.php` admin page
+  - List view with all seasons
+  - Add/Edit season forms
+  - Delete with confirmation
+  - Create default seasons option
+  - Date formatting for display
+- Updated admin.css with pricing styles
+- Updated admin.js with pricing interactions
+- Updated Plugin.php to register Seasons admin page
+- Updated version to 0.2.0
+
+**Learnings:**
+
+- PHP 8.1+ enums work well for pricing tiers with methods
+- Season date ranges use MM-DD format for annual recurrence
+- Year-spanning seasons require special comparison logic
+- Price modifiers as multipliers are more flexible than percentages
+- Calculator class separates concerns from post type class
+- Weekend days stored as comma-separated string in options