fix: pace capsule animation glitch in trip options view

Adds contentTransition(.identity) to pace filter icon and text to prevent
SwiftUI's default text morphing animation when changing pace filter
(All/Packed/Moderate/Relaxed). Also adds animation(nil, value:) to
disable animations on the capsule container.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

SportsTime/Features/Trip/Views/TripCreationView.swift

@@ -1719,8 +1719,10 @@ struct TripOptionsView: View {
             HStack(spacing: 6) {
                 Image(systemName: paceFilter.icon)
                     .font(.caption)
+                    .contentTransition(.identity)
                 Text(paceFilter.rawValue)
                     .font(.subheadline)
+                    .contentTransition(.identity)
                 Image(systemName: "chevron.down")
                     .font(.caption2)
             }
@@ -1733,6 +1735,7 @@ struct TripOptionsView: View {
                 Capsule()
                     .strokeBorder(paceFilter == .all ? Theme.textMuted(colorScheme).opacity(0.2) : Theme.warmOrange.opacity(0.3), lineWidth: 1)
             )
+            .animation(nil, value: paceFilter)
         }
     }