FIX: Add Horizontal Scroll to CSV Viewer Toolbar on Overflow (#48)

* fix: add horizontal scroll to CSV viewer toolbar on overflow

Added overflow handling to prevent toolbar content from being compressed on small screens.

Changes:
- Added overflow-x: auto to .csv-viewer-toolbar for horizontal scroll
- Added flex-shrink: 0 to toolbar children to prevent compression
- Added white-space: nowrap to stats and warning text to prevent wrapping

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

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

* fix: add gap to toolbar to maintain spacing on overflow

Added gap: 16px to ensure consistent spacing between toolbar items
when overflow scroll is active. Without gap, space-between loses
effect during overflow and items appear bunched together.

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

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

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: tahierhussain

frontend/src/ide/editor/csv-viewer.css

@@ -9,18 +9,27 @@
   display: flex;
   align-items: center;
   justify-content: space-between;
+  gap: 16px;
   padding: 8px 12px;
   border-bottom: 1px solid var(--border-color-1, #e2e8f0);
   background: var(--page-bg-1, #f8fafc);
   flex-shrink: 0;
+  overflow-x: auto;
+}
+
+/* Prevent toolbar children from shrinking */
+.csv-viewer-toolbar > * {
+  flex-shrink: 0;
 }
 
 .csv-viewer-stats {
   font-size: 12px;
+  white-space: nowrap;
 }
 
 .csv-viewer-warning {
   font-size: 12px;
+  white-space: nowrap;
 }
 
 .csv-viewer-table {