Changes

tsk7: Introduces Story Card component and updates homepage story grid
Added a new JSF composite component called story-card.xhtml to provide a 
richer and more modern presentation for stories. Updated index.xhtml to 
replace the old Bootstrap-based card markup with this new component. 
Introduced a full set of CSS rules for the Story Card, including hover 
transitions, badges, themes, excerpt clamping and author avatar styling. 
Adjusted the .story-title selector so it applies only within
.story-hero, preventing unintended global overrides.