fix: remove scrollbar from Charts panel views

- Change #chart-container overflow from auto to hidden
- Change .chart-area-full min-height from 250px to 0
- Change .chart-area-full overflow from auto to hidden

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

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

Author: robcohen

.gitignore

@@ -23,3 +23,4 @@ Thumbs.db
 
 # Logs
 *.log
+.playwright-mcp/

src/style.css

@@ -527,7 +527,7 @@ body {
 
 #chart-container {
     flex: 1;
-    overflow: auto;
+    overflow: hidden;
 }
 
 .chart-single {
@@ -544,13 +544,13 @@ body {
 
 .chart-area-full {
     flex: 1;
-    min-height: 250px;
+    min-height: 0;
     position: relative;
     display: flex;
     flex-direction: column;
     align-items: center;
     justify-content: flex-start;
-    overflow: auto;
+    overflow: hidden;
 }
 
 .chart-area-full svg {