Fix widget layout clipping and add comprehensive widget previews

- Fix LargeVotingView mood icons getting clipped at edges by using
  flexible HStack spacing with maxWidth: .infinity
- Fix VotingView medium layout with smaller icons and even distribution
- Add comprehensive #Preview macros for all widget states:
  - Vote widget: small/medium, voted/not voted, all mood states
  - Timeline widget: small/medium/large with various data states
- Reduce icon sizes and padding to fit within widget bounds
- Update accessibility labels and hints across views

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Shared/Views/PhotoPickerView.swift

@@ -27,7 +27,7 @@ struct PhotoPickerView: View {
                 // Header
                 VStack(spacing: 8) {
                     Image(systemName: "photo.on.rectangle.angled")
-                        .font(.system(size: 50))
+                        .font(.largeTitle)
                         .foregroundStyle(.secondary)
 
                     Text("Add a Photo")
@@ -281,7 +281,7 @@ struct PhotoGalleryView: View {
                     } else {
                         VStack(spacing: 16) {
                             Image(systemName: "photo.badge.exclamationmark")
-                                .font(.system(size: 50))
+                                .font(.largeTitle)
                                 .foregroundColor(.gray)
 
                             Text("Photo not found")