feat: Add carousel functionality with scrolling and image handling in RoomTimeline

src/app/features/room/RoomTimeline.css.ts

@@ -1,5 +1,6 @@
+import { style } from '@vanilla-extract/css';
 import { RecipeVariants, recipe } from '@vanilla-extract/recipes';
-import { DefaultReset, config } from 'folds';
+import { DefaultReset, color, config, toRem } from 'folds';
 
 export const TimelineFloat = recipe({
   base: [
@@ -28,3 +29,81 @@ export const TimelineFloat = recipe({
 });
 
 export type TimelineFloatVariants = RecipeVariants<typeof TimelineFloat>;
+
+export const CarouselScroller = style([
+  DefaultReset,
+  {
+    display: 'flex',
+    gap: config.space.S200,
+    overflowX: 'auto',
+    overflowY: 'hidden',
+    paddingBottom: config.space.S100,
+    width: '100%',
+    cursor: 'grab',
+    userSelect: 'none',
+  },
+]);
+
+export const CarouselScrollerDragging = style([
+  DefaultReset,
+  {
+    cursor: 'grabbing',
+  },
+]);
+
+export const CarouselItem = style([
+  DefaultReset,
+  {
+    flex: '0 0 auto',
+    maxWidth: '100%',
+  },
+]);
+
+export const CarouselEdgeGradient = recipe({
+  base: [
+    DefaultReset,
+    {
+      position: 'absolute',
+      top: 0,
+      height: '100%',
+      width: toRem(16),
+      pointerEvents: 'none',
+      zIndex: 1,
+    },
+  ],
+  variants: {
+    position: {
+      Left: {
+        left: 0,
+        background: `linear-gradient(to right, ${color.Surface.Container}, rgba(116, 116, 116, 0))`,
+      },
+      Right: {
+        right: 0,
+        background: `linear-gradient(to left, ${color.Surface.Container}, rgba(116, 116, 116, 0))`,
+      },
+    },
+  },
+});
+
+export const CarouselScrollBtn = recipe({
+  base: [
+    DefaultReset,
+    {
+      position: 'absolute',
+      top: '50%',
+      zIndex: 2,
+    },
+  ],
+  variants: {
+    position: {
+      Left: {
+        left: 0,
+        transform: 'translate(-25%, -50%)',
+      },
+      Right: {
+        right: 0,
+        transform: 'translate(25%, -50%)',
+      },
+    },
+  },
+});