Placements are stored attack-canonical, so a page's side is only the
direction the map is drawn from. A plain click on the side toggle now
flips every page; Shift+click flips this page only, which is how a
strategy becomes mixed on purpose. The toggle shows a dot when pages
disagree and its tooltip explains both paths.

Adds two editable shortcuts: Switch Side (F) and Switch Side (This
Page) (Shift+F). Schema, export, and import are unchanged.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>