feat: display benefits as individual lines with icon, name, and type

Enhanced the inventory tab to show each benefit on its own line instead of
an icon grid. Each benefit now displays with:
- Icon (40x40px) on the left
- Benefit name and type on the right in format: "Name (TYPE)"

Changes:
- Backend: Send full benefit data (name, type, image_url) instead of just URLs
- Frontend: Render benefits as vertical list of horizontal lines
- CSS: Add new styles for benefit items (.benefit-item, .benefit-icon, .benefit-info)
- Removed: Icon grid layout (chunks of 3) and rewards text field

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/web/managers/inventory.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import asyncio
+import logging
 from typing import TYPE_CHECKING, Any
 
 
@@ -12,6 +13,9 @@ if TYPE_CHECKING:
     from src.web.managers.cache import ImageCache
 
 
+logger = logging.getLogger("TwitchDrops")
+
+
 class InventoryManager:
     """Manages drop campaign inventory display in the web interface.
 
@@ -41,6 +45,16 @@ class InventoryManager:
 
         drops_data = []
         for drop in campaign.drops:
+            # Collect full benefit data (filter out benefits without images)
+            benefits_data = [
+                {
+                    "name": benefit.name,
+                    "type": benefit.type.name,
+                    "image_url": str(benefit.image_url),
+                }
+                for benefit in drop.benefits
+                if benefit.image_url
+            ]
             drops_data.append(
                 {
                     "id": drop.id,
@@ -50,7 +64,7 @@ class InventoryManager:
                     "progress": drop.progress,
                     "is_claimed": drop.is_claimed,
                     "can_claim": drop.can_claim,
-                    "rewards": drop.rewards_text(),
+                    "benefits": benefits_data,
                     "starts_at": drop.starts_at.isoformat(),
                     "ends_at": drop.ends_at.isoformat(),
                 }