Add Stationery and Stationery Dark themes with notebook chrome.

Manila folders, ruled chat, post-it nav, and folder tabs; dark variant uses Catppuccin Mocha colors with muted stickies and soft glows.

src/app/components/message/Reaction.css.ts

@@ -53,6 +53,19 @@ export const Reaction = style([
   },
 ]);
 
+export const ReactionStack = style([
+  DefaultReset,
+  {
+    position: 'relative',
+    display: 'inline-grid',
+    placeItems: 'center',
+    gridTemplateColumns: '1fr',
+    gridTemplateRows: '1fr',
+    lineHeight: toRem(20),
+    minWidth: 0,
+  },
+]);
+
 export const ReactionText = style([
   DefaultReset,
   {
@@ -60,7 +73,15 @@ export const ReactionText = style([
     maxWidth: toRem(150),
     display: 'inline-flex',
     alignItems: 'center',
+    justifyContent: 'center',
     lineHeight: toRem(20),
+    gridArea: '1 / 1',
+    transformOrigin: 'center center',
+    // Fan each stacked copy so count>1 reads as multiple stickers
+    transform: `translate(
+      calc(var(--sticker-i, 0) * 7px - 2px),
+      calc(var(--sticker-i, 0) * -5px)
+    ) rotate(calc((var(--sticker-i, 0) - 1) * 12deg))`,
   },
 ]);