Redesign Drill Studio modal with cleaner UI and new features

Restructure OpeningSelectionModal into a 2-panel layout (browse + studio)
with compact typography, reduced borders, and intelligent whitespace for
hierarchy. Add PGN move display in browse rows with stem/suffix splitting
for variations (e.g. "3. ...Bc5"), clickable queue pills that navigate to
the selected opening, two-column queue grid on wide screens, and an
infinite target moves option on the slider. Rename to "Maia Drill Studio".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ashtonanderson

src/components/Openings/OpeningDrillAnalysis.tsx

@@ -226,7 +226,6 @@ export const OpeningDrillAnalysis: React.FC<Props> = ({
             </div>
           )}
         </div>
-
       </div>
     </div>
   )