feat: make team section a floating sidebar on desktop

Add responsive 2-column layout for the encounters page:
- Desktop (lg, ≥1024px): Encounters on left, team in sticky right sidebar
- Mobile/tablet: Keep current stacked layout

The sidebar scrolls independently when team exceeds viewport height.

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

.beans/nuzlocke-tracker-lkro--ux-make-team-section-a-floating-sidebar-on-desktop.md

@@ -1,11 +1,11 @@
 ---
 # nuzlocke-tracker-lkro
 title: 'UX: Make team section a floating sidebar on desktop'
-status: todo
+status: in-progress
 type: feature
 priority: normal
 created_at: 2026-03-21T21:50:48Z
-updated_at: 2026-03-22T08:08:13Z
+updated_at: 2026-03-22T09:10:47Z
 ---
 
 ## Problem
@@ -28,9 +28,9 @@ Alternative: A floating action button (FAB) that opens the team in a slide-over
 
 ## Checklist
 
-- [ ] Add responsive 2-column layout to RunEncounters page (desktop only)
-- [ ] Move team section into a sticky sidebar column
-- [ ] Ensure sidebar scrolls independently if team is taller than viewport
-- [ ] Keep current stacked layout on mobile/tablet
+- [x] Add responsive 2-column layout to RunEncounters page (desktop only)
+- [x] Move team section into a sticky sidebar column
+- [x] Ensure sidebar scrolls independently if team is taller than viewport
+- [x] Keep current stacked layout on mobile/tablet
 - [ ] Test with various team sizes (0-6 pokemon)
 - [ ] Test evolution/nickname editing still works from sidebar