fix: refine container interactions

apps/docs/docs/getting-started/after-the-installation.mdx

@@ -335,10 +335,12 @@ Each Container can configure:
 Open the add-content menu and choose **New Container**.
 In edit mode, move and resize it like any other item, then drag items into or out of it.
 Nested content stays within the Container's bounds.
+While resizing, the solid outline follows the pointer continuously and the dashed grid preview shows the size that will be saved on release.
 
 ### Collapsing and opening apps
 
 Users can collapse an eligible Container like an accordion in view mode without changing its saved expanded size.
+The full-width header becomes the compact expansion bar, so the half-row state has no empty pill-shaped spacer.
 Expanding it restores its bounds and makes room for its contents.
 If **Open all in new tabs** is enabled, the Container menu can open every app link it contains.