fix: break line in flyout menu's item, toolbar's width

To do:

• Break line on too-long-text item (flyout menu)
• Prevent breaking line on text (toolbar's item)

Design review:

• Header
• Secondary header

Output:

Note: Please test them in fullscreen mode of Ladle. Ladle's sidebar consumes a certain width of the whole viewport, so it affects our responsive implementation. Thanks.

Closes #25 (closed) #3 (closed)