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/Utilities/AccessibilityHelpers.swift

@@ -90,11 +90,6 @@ extension Font {
     static func scalable(_ style: Font.TextStyle, weight: Font.Weight = .regular) -> Font {
         Font.system(style, design: .rounded).weight(weight)
     }
-
-    /// Returns a custom-sized font that scales with Dynamic Type
-    static func scaledSystem(size: CGFloat, weight: Font.Weight = .regular, design: Font.Design = .default, relativeTo style: Font.TextStyle = .body) -> Font {
-        Font.system(size: size, weight: weight, design: design)
-    }
 }
 
 /// Property wrapper for scaled metrics that respect Dynamic Type