v2.1: Add dynamic weather effects, clothing inventory, and bug fixes

Features:
- Add dynamic weather effects system (snow, rain, mist, sunshine, storm, wind, blizzard)
- Add separate Clothing tab in inventory system
- Weather effects auto-update based on Info Box weather field
- Combined effects for storm (rain+lightning) and blizzard (snow+wind)

Improvements:
- Settings migration system for automatic feature enablement
- Weather effects positioned behind chat interface (z-index: 1)
- Dynamic weather enabled by default for new users

Bug Fixes:
- Fix tab visibility issues (disabled tabs now properly hide)
- Fix theme-aware borders (remove hardcoded blue colors)
- Fix double scrollbar in Edit Trackers window
- Fix scroll position jumping when editing Present Characters
- Fix dynamic weather toggle hiding issue

Technical:
- Update inventory schema to v2.1 with clothing field
- Add automatic migration for existing v2 inventories
- Update parsers and prompts to handle clothing separately
- Add translations (EN/ZH-TW) for new features

settings.html

@@ -30,7 +30,7 @@
             </div>
 
             <div style="margin-top: 10px; text-align: center; opacity: 0.6; font-size: 0.85em;">
-                RPG Companion v2.0
+                RPG Companion v2.1
             </div>
         </div>
     </div>