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>

landing_page/index-v3.html

@@ -1107,6 +1107,12 @@
                 <h3>Privacy</h3>
                 <p>Your data stays on your devices. iCloud sync with no third-party access.</p>
             </div>
+
+            <div class="feature-card fade-in">
+                <div class="feature-number">07</div>
+                <h3>WCAG 2.1 AA</h3>
+                <p>Built for everyone. Full VoiceOver support, Dynamic Type, and high contrast ensure no one is left behind.</p>
+            </div>
         </div>
     </section>