refactor(ui): improve UI/UX design and spacing

- Increase card padding and gaps for better visual hierarchy
- Add hover lift effect to cards with smooth transitions
- Improve typography with larger headings and better line-height
- Darken meta text colors for better readability
- Add checkbox styling with accent color
- Make tags interactive with hover effects
- Add mobile responsive styles for forms and footer
- Replace Unicode arrows with SVG icons
- Improve focus styles for accessibility
- Increase badge padding and font-weight
- Add subtle shadow to cards by default

app/presentation/templates/pages/index.html

@@ -50,7 +50,12 @@
                 <span class="tag" data-testid="post-tag-{{ post.id }}-{{ loop.index }}">{{ tag }}</span>
                 {% endfor %}
             </div>
-            <a href="/posts/{{ post.id }}" class="btn btn-sm" data-testid="btn-read-more-{{ post.id }}">Read more</a>
+            <a href="/posts/{{ post.id }}" class="btn btn-sm" data-testid="btn-read-more-{{ post.id }}">
+                Read more
+                <svg width="14" height="14" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-left: 0.25rem;">
+                    <path d="M6 12L10 8L6 4" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                </svg>
+            </a>
         </div>
     </article>
     {% endfor %}