fix(gowlers-tracking-ledger): preserve value sign for correct damage classification

- Fix critical bug where damage was classified as 'Healing' instead of 'Damage'
- Changed queue storage to preserve sign of value (negative=damage, positive=healing)
- This allows buildSourceLabel() to correctly classify HP changes as damage vs healing
- Update version to 0.1.18

The issue was storing Math.abs(value) which stripped the sign. Now storing raw value
so that damage classification logic can use: value < 0 ? "Damage" : "Healing"

🤖 Generated with Claude Code

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

src/macros_new/gowlers-tracking-ledger/module.json

@@ -3,7 +3,7 @@
   "type": "module",
   "title": "Gowler's Tracking Ledger",
   "description": "Adds HP/XP/Currency log buttons to PF1 sheets and opens the tracking dialog preloaded with the actor's logs.",
-  "version": "0.1.13",
+  "version": "0.1.18",
   "authors": [
     { "name": "Gowler", "url": "https://foundryvtt.com" }
   ],