Add documentation for layout item rotation handles (#10063)

Author: DelazJ

docs/user_manual/print_composer/composer_items/composer_items_options.rst

@@ -117,6 +117,18 @@ by distributing equidistantly:
 * centers of items horizontally or vertically;
 * spacing between items horizontally or vertically.
 
+.. _rotate_items:
+
+Rotating items
+..............
+
+Selected layout items feature a rotation handle above them.  
+Click and drag this handle to rotate the item interactively on the layout canvas.  
+Holding the :kbd:`Ctrl` key while rotating constrains the selected item(s) to rotate in 15° steps,
+allowing for precise alignment.
+
+For even more precise control, you can use the :guilabel:`Rotation` field in the :guilabel:`Item Properties` panel.
+
 .. _group_items:
 
 Grouping items
@@ -216,6 +228,8 @@ Background, Item ID, Variables and Rendering (see :numref:`figure_layout_common`
 * The :guilabel:`Position and size` group lets you define the size and position
   of the frame which contains the item (see :ref:`position_size` for more information).
 * The :guilabel:`Rotation` sets the rotation of the element (in degrees).
+  You can also rotate the item interactively using its rotation handle.  
+  See :ref:`rotate_items` for more details.
 * The |checkbox| :guilabel:`Frame` shows or hides the frame around the item.
   Use the :guilabel:`Color`, :guilabel:`Thickness` and :guilabel:`Join style` widgets
   to adjust those properties.

docs/user_manual/print_composer/overview_composer.rst

@@ -14,6 +14,7 @@ It allows you to add elements such as the QGIS 2D or 3D map canvas, text labels,
 scale bars, basic shapes, arrows, attribute and simple tables, elevation profiles and HTML frames...
 You can size, group, align, position and rotate each element
 and adjust their properties to create your layout.
+
 The layout can be printed or exported to image formats, PostScript, PDF or to SVG.
 You can save the layout as a template and load it again in another session.
 Finally, generating several maps based on a template can be done through the atlas generator.