test: Add tests for containers, tabs, reordering, and grouping

54 tests: group always has 1 tab, add tab creates 2nd, title syncs
from tabs[0], delete to 1 keeps tab, fill-right positioning, tabId
cleanup on grouping, section reorder, tile grouping.

Author: alex-fedotyev

packages/app/src/DBDashboardPage.tsx

@@ -2054,18 +2054,14 @@ function DBDashboardPage({ presetConfig }: { presetConfig?: Dashboard }) {
                               tileCount={containerTiles.length}
                               collapsed={isSectionCollapsed(container)}
                               defaultCollapsed={container.collapsed ?? false}
-                              onToggle={() =>
-                                handleToggleSection(container.id)
-                              }
+                              onToggle={() => handleToggleSection(container.id)}
                               onToggleDefaultCollapsed={() =>
                                 handleToggleDefaultCollapsed(container.id)
                               }
                               onRename={newTitle =>
                                 handleRenameSection(container.id, newTitle)
                               }
-                              onDelete={() =>
-                                handleDeleteSection(container.id)
-                              }
+                              onDelete={() => handleDeleteSection(container.id)}
                               onAddTile={() => onAddTile(container.id)}
                               dragHandleProps={dragHandleProps}
                             />