fix: resolve NullPointerException crash when tapping collapsed history entries

Removed problematic scrollbar configuration from NestedScrollView that caused
ScrollBarDrawable.mutate() to throw NPE when accessing collapsed cards.
Scrollbar styling is not essential for core functionality.

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

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

app/src/main/java/com/quillstudios/pokegoalshelper/ui/HistoryAdapter.kt

@@ -240,9 +240,7 @@ class HistoryAdapter(
             // Configure scrolling behavior optimized for nested scrolling
             isFillViewport = false
             isNestedScrollingEnabled = true
-            isVerticalScrollBarEnabled = true  // Show scrollbar for visual confirmation
-            scrollBarStyle = View.SCROLLBARS_INSIDE_OVERLAY
-            isScrollbarFadingEnabled = false  // Keep scrollbar visible
+            // Remove scrollbar config that causes crash - scrollbars not essential for functionality
             tag = "expanded_content"
             
             val contentContainer = LinearLayout(context).apply {