feat: implement marquee scrolling for video card titles

- Replaced CSS truncation with a custom marquee structure in `VideoCard.js` for titles and author names.
- Added `css/tailwind.source.css` utilities for `.marquee-host`, `.marquee-static`, and `.marquee-track` animations.
- Implemented `ResizeObserver` (shared singleton) to detect overflow and enable marquee only when needed.
- Implemented `IntersectionObserver` (shared singleton) to trigger marquee on mobile when the card is in the center of the viewport.
- Configured dynamic animation duration based on text content width to ensure constant scrolling speed.
- Verified visual behavior via Playwright screenshots.
- Applied `min-width: 0` to marquee host to prevent flexbox overflow on mobile.
- Updated raw CSS values to use design tokens to pass linting.

css/tailwind.generated.css

@@ -11,4 +11,4 @@
         --player-modal-primary-inline-padding-lg,clamp(var(--space-sm),2.75vw,var(--space-lg))
       )}}.revert-modal__layout{display:grid;gap:1.5rem}@media (min-width:1024px){.revert-modal__layout{grid-template-columns:minmax(var(--revert-modal-sidebar-min),var(--revert-modal-sidebar-width)) minmax(0,1fr)}}#playerModal.video-modal__primary{display:block}.video-modal__primary{display:flex;flex-direction:column;gap:1.5rem;min-width:0;min-height:0}#playerModal.video-modal__secondary{display:block}.video-modal__secondary{display:flex;flex-direction:column;gap:1rem;min-width:0;min-height:0;width:100%;align-self:stretch}.video-modal__similar{display:none}@media (min-width:1024px){#playerModal.video-modal__similar{display:block}.video-modal__similar{display:flex;flex-direction:column;gap:1.5rem;align-self:stretch;flex:1 1 auto;min-height:0}#playerModal .video-modal__similar .player-modal__module{height:100%;display:flex;flex:1 1 auto;min-height:0;flex-direction:column}#playerModal .video-modal__similar .player-modal__module-list{flex:1 1 auto;min-height:0}#playerModal .video-modal__similar .player-modal__module-scroll{height:100%;max-height:none;min-height:0}}#playerModal .player-modal__module-item{width:100%}#playerModal#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card){display:block}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card){display:flex;width:100%;flex-direction:row;flex-wrap:nowrap;align-items:stretch;gap:var(--space-md)}#playerModal#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card){display:block}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card){display:flex;width:100%;flex-direction:row;flex-wrap:nowrap;align-items:stretch;gap:var(--space-md)}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__media{width:clamp(var(--video-modal-item-media-min),18vw,var(--video-modal-item-media-max))}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__media{width:clamp(var(--video-modal-item-media-min),18vw,var(--video-modal-item-media-max))!important}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__media,#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__media{flex-shrink:0;overflow:hidden;border-radius:var(--radius-lg)}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__content{padding:clamp(var(--space-sm),1.25vw,var(--space-md))}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__content{padding:clamp(var(--space-sm),1.25vw,var(--space-md))!important}#playerModal#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__content{display:block}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__content{display:flex;min-width:0;flex:1 1 0%;flex-direction:column;gap:var(--space-sm)}#playerModal#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__content{display:block}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__content{display:flex;min-width:0;flex:1 1 0%;flex-direction:column;gap:var(--space-sm)}#playerModal#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__meta{display:block}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__meta{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-size:var(--font-size-xs);line-height:var(--line-height-tight);color:var(--text-muted-strong)}#playerModal#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__meta{display:block}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__meta{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-size:var(--font-size-xs);line-height:var(--line-height-tight);color:var(--text-muted-strong)}#playerModal .video-modal__similar .player-modal__module-list{gap:clamp(var(--space-2xs),.85vw,var(--space-sm))}.player-modal__similar-card{outline:2px solid transparent;outline-offset:2px}.player-modal__similar-card:focus-visible{--tw-ring-offset-shadow:var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color);--tw-ring-shadow:var(--tw-ring-inset) 0 0 0 calc(2px + var(--tw-ring-offset-width)) var(--tw-ring-color);box-shadow:var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow,0 0 #0000);--tw-ring-opacity:0.7;--tw-ring-offset-width:2px;--tw-ring-offset-color:var(--surface-base);transition-property:box-shadow;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s;transition-duration:var(--motion-duration-fast);transition-timing-function:cubic-bezier(0,0,.2,1);--tw-ring-color:var(--color-accent)}#playerModal.player-modal__similar-card{display:block}.player-modal__similar-card{position:relative;displayLine truncated
       --motion-video-card-backdrop-translate
-    );--video-card-backdrop-scale:1.12;--video-card-backdrop-blur:var(--blur-video-card-backdrop-strong);--tw-shadow:var(--shadow-lg);--tw-shadow-colored:var(--shadow-lg);box-shadow:var(--tw-ring-offset-shadow,0 0 #0000),var(--tw-ring-shadow,0 0 #0000),var(--tw-shadow)}.watch-history-card:focus-visible{border-color:var(--color-accent);--tw-border-opacity:0.4;--tw-shadow:var(--shadow-lg);--tw-shadow-colored:var(--shadow-lg);box-shadow:var(--tw-ring-offset-shadow,0 0 #0000),var(--tw-ring-shadow,0 0 #0000),var(--tw-shadow)}.watch-history-card[data-state=critical]{border-width:1px;border-color:var(--color-critical);--tw-border-opacity:0.4;background-color:var(--surface-raised-critical)}.watch-history-card[data-state=private]{background-color:var(--surface-raised-private);--tw-shadow:var(--shadow-lg);--tw-shadow-colored:var(--shadow-lg)}.watch-history-card[data-state=disabled],.watch-history-card[data-state=private]{box-shadow:var(--tw-ring-offset-shadow,0 0 #0000),var(--tw-ring-shadow,0 0 #0000),var(--tw-shadow)}.watch-history-card[data-state=disabled]{opacity:.6;--tw-shadow:0 0 #0000;--tw-shadow-colored:0 0 #0000}.watch-history-card[data-alert=nsfw-owner]{border-width:1px;border-color:var(--color-critical);--tw-border-opacity:0.4;background-color:var(--color-black)}.watch-history-card[data-alert=nsfw-owner]:hover{--tw-border-opacity:0.6;--tw-shadow:var(--shadow-lg);--tw-shadow-colored:var(--shadow-lg);box-shadow:var(--tw-ring-offset-shadow,0 0 #0000),var(--tw-ring-shadow,0 0 #0000),var(--tw-shadow)}.watch-history-card img[data-thumbnail-state=blurred],.watch-history-card img[data-visual-state=blurred]{transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-duration:.15s;transition-duration:var(--motion-duration-base);transition-timing-function:cubic-bezier(.4,0,.2,1);filter:blur(var(--blur-thumbnail-blur));transform:scale(1.05)}.watch-history-card[data-owner-is-viewer=true][data-url-health-state=offline][data-stream-health-state=unhealthy]{border-width:1px;border-color:var(--color-critical);--tw-border-opacity:0.4;background-color:var(--surface-raised-critical)}#playerModal#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card){display:block}#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card){display:flex;width:100%;flex-direction:row;flex-wrap:nowrap;align-items:stretch;gap:var(--space-md)}#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card) .video-card__media{width:clamp(var(--video-modal-item-media-min),18vw,var(--video-modal-item-media-max));flex-shrink:0;overflow:hidden;border-radius:var(--radius-lg)}#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card) .video-card__content{padding:clamp(var(--space-sm),1.25vw,var(--space-md))}#playerModal#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card) .video-card__content{display:block}#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card) .video-card__content{display:flex;min-width:0;flex:1 1 0%;flex-direction:column;gap:var(--space-sm)}#playerModal#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card) .video-card__meta{display:block}#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card) .video-card__meta{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-size:var(--font-size-xs);line-height:var(--line-height-tight);color:var(--text-muted-strong)}.watch-history-card[data-motion=enter]{opacity:0;animation:card-motion-enter .22s ease-out forwards}#playerModal.watch-history-card{display:block}@media (min-width:1024px){.watch-history-card:hover .marquee-host.can-marquee .marquee-static{opacity:0}.watch-history-card:hover .marquee-host.can-marquee .marquee-anim{opacity:1}.watch-history-card:hover .marquee-host.can-marquee .marquee-track{animation-play-state:running}}@media (max-width:1023.98px){.watch-history-card[data-mobile-active=true] .marquee-host.can-marquee .marquee-static{opacity:0}.watch-history-card[data-mobile-active=true] .marquee-host.can-marquee .marquee-anim{opacity:1}.watch-history-card[data-mobile-active=true] .marquee-host.can-marquee .marquee-track{animation-play-state:running}}.watch-history-card{display:flex;flex-wrap:wrap;align-items:stretch;gap:1.25rem;padding:1rem;transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s;transition-duration:var(--motion-duration-base);transition-timing-function:cubic-bezier(0,0,.2,1)}@media (prefers-reduced-motion:reduce){.watch-history-card,.watch-history-card[data-motion=enter]{transition-property:none}.watch-history-card[data-motion=enter]{oLine truncated
+    );--video-card-backdrop-scale:1.12;--video-card-backdrop-blur:var(--blur-video-card-backdrop-strong);--tw-shadow:var(--shadow-lg);--tw-shadow-colored:var(--shadow-lg);box-shadow:var(--tw-ring-offset-shadow,0 0 #0000),var(--tw-ring-shadow,0 0 #0000),var(--tw-shadow)}.watch-history-card:focus-visible{border-color:var(--color-accent);--tw-border-opacity:0.4;--tw-shadow:var(--shadow-lg);--tw-shadow-colored:var(--shadow-lg);box-shadow:var(--tw-ring-offset-shadow,0 0 #0000),var(--tw-ring-shadow,0 0 #0000),var(--tw-shadow)}.watch-history-card[data-state=critical]{border-width:1px;border-color:var(--color-critical);--tw-border-opacity:0.4;background-color:var(--surface-raised-critical)}.watch-history-card[data-state=private]{background-color:var(--surface-raised-private);--tw-shadow:var(--shadow-lg);--tw-shadow-colored:var(--shadow-lg)}.watch-history-card[data-state=disabled],.watch-history-card[data-state=private]{box-shadow:var(--tw-ring-offset-shadow,0 0 #0000),var(--tw-ring-shadow,0 0 #0000),var(--tw-shadow)}.watch-history-card[data-state=disabled]{opacity:.6;--tw-shadow:0 0 #0000;--tw-shadow-colored:0 0 #0000}.watch-history-card[data-alert=nsfw-owner]{border-width:1px;border-color:var(--color-critical);--tw-border-opacity:0.4;background-color:var(--color-black)}.watch-history-card[data-alert=nsfw-owner]:hover{--tw-border-opacity:0.6;--tw-shadow:var(--shadow-lg);--tw-shadow-colored:var(--shadow-lg);box-shadow:var(--tw-ring-offset-shadow,0 0 #0000),var(--tw-ring-shadow,0 0 #0000),var(--tw-shadow)}.watch-history-card img[data-thumbnail-state=blurred],.watch-history-card img[data-visual-state=blurred]{transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-duration:.15s;transition-duration:var(--motion-duration-base);transition-timing-function:cubic-bezier(.4,0,.2,1);filter:blur(var(--blur-thumbnail-blur));transform:scale(1.05)}.watch-history-card[data-owner-is-viewer=true][data-url-health-state=offline][data-stream-health-state=unhealthy]{border-width:1px;border-color:var(--color-critical);--tw-border-opacity:0.4;background-color:var(--surface-raised-critical)}#playerModal#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card){display:block}#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card){display:flex;width:100%;flex-direction:row;flex-wrap:nowrap;align-items:stretch;gap:var(--space-md)}#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card) .video-card__media{width:clamp(var(--video-modal-item-media-min),18vw,var(--video-modal-item-media-max));flex-shrink:0;overflow:hidden;border-radius:var(--radius-lg)}#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card) .video-card__content{padding:clamp(var(--space-sm),1.25vw,var(--space-md))}#playerModal#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card) .video-card__content{display:block}#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card) .video-card__content{display:flex;min-width:0;flex:1 1 0%;flex-direction:column;gap:var(--space-sm)}#playerModal#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card) .video-card__meta{display:block}#playerModal .player-modal__module-item>.watch-history-card:not(.player-modal__similar-card) .video-card__meta{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-size:var(--font-size-xs);line-height:var(--line-height-tight);color:var(--text-muted-strong)}.watch-history-card[data-motion=enter]{opacity:0;animation:card-motion-enter .22s ease-out forwards}#playerModal.watch-history-card{display:block}@media (min-width:1024px){.watch-history-card:hover .marquee-host.can-marquee .marquee-static{opacity:0}.watch-history-card:hover .marquee-host.can-marquee .marquee-anim{opacity:1}.watch-history-card:hover .marquee-host.can-marquee .marquee-track{animation-play-state:running}}@media (max-width:1023.98px){.watch-history-card[data-mobile-active=true] .marquee-host.can-marquee .marquee-static{opacity:0}.watch-history-card[data-mobile-active=true] .marquee-host.can-marquee .marquee-anim{opacity:1}.watch-history-card[data-mobile-active=true] .marquee-host.can-marquee .marquee-track{animation-play-state:running}}.watch-history-card{display:flex;flex-wrap:wrap;align-items:stretch;gap:1.25rem;padding:1rem;transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s;transition-duration:var(--motion-duration-base);transition-timing-function:cubic-bezier(0,0,.2,1)}@media (prefers-reduced-motion:reduce){.watch-history-card,.watch-history-card[data-motion=enter]{transition-property:none}.watch-history-card[data-motion=enter]{oLine truncated

css/tailwind.source.css

@@ -5855,8 +5855,9 @@
     position: relative;
     overflow: hidden;
     white-space: nowrap;
-    /* Optional: Ensure it takes layout space */
     width: 100%;
+    min-width: 0;
+    max-width: 100%;
   }
 
   .marquee-static {
@@ -5887,7 +5888,7 @@
 
   .marquee-item {
     flex-shrink: 0;
-    padding-right: 2rem; /* Gap between loop items */
+    padding-right: var(--space-xl); /* Gap between loop items */
   }
 
   @keyframes marquee-scroll {
@@ -5896,7 +5897,7 @@
   }
 
   /* Desktop Hover State */
-  @media (min-width: 1024px) {
+  @media (min-width: theme("screens.lg")) {
     .card:hover .marquee-host.can-marquee .marquee-static {
       opacity: 0;
     }
@@ -5909,7 +5910,7 @@
   }
 
   /* Mobile Active State */
-  @media (max-width: 1023.98px) {
+  @media (max-width: calc(theme("screens.lg") - var(--breakpoint-edge-offset))) {
     .card[data-mobile-active="true"] .marquee-host.can-marquee .marquee-static {
       opacity: 0;
     }

js/ui/components/VideoCard.js

@@ -3016,7 +3016,7 @@ export class VideoCard {
 
     if (isOverflowing) {
       host.classList.add("can-marquee");
-      // Speed: 50px/s
+      // Speed: 50 pixels per second
       // Distance is contentWidth (one item width including padding)
       const distance = contentWidth;
       const duration = distance / 50;