feat(sticky): proportional card width per text size preset

Each S/M/L/XL/XXL preset now sets both fontSize and card width:
S(20px/200w), M(28px/260w), L(36px/320w), XL(48px/400w), XXL(60px/480w).

Creation picks preset based on zoom, toolbar toggle updates both.
Wider size toggle buttons for XL/XXL labels, font name maxWidth 110px.
Backward compatible — existing stickies keep original width.

frontend/src/canvas/tools.ts

@@ -37,7 +37,7 @@ const defaultOptions: ToolOptions = {
 
 // Creation defaults — zoom-aware via screenToWorld()
 const DEFAULT_TEXT_SCREEN_FONT = 24;
-const DEFAULT_STICKY_SCREEN_FONT = 14;
+const DEFAULT_STICKY_SCREEN_FONT = 28;
 const DEFAULT_STICKY_SCREEN_WIDTH = 220;
 const DEFAULT_STICKY_SCREEN_HEIGHT = 66;
 
@@ -328,7 +328,8 @@ export function activateTool(
         const world = viewport.toWorld(e.clientX - rect.left, e.clientY - rect.top);
 
         const zoom = viewport.scale.x;
-        const cardW = screenToWorld(DEFAULT_STICKY_SCREEN_WIDTH, zoom, 120, 400);
+        const preset = snapToStickyPreset(screenToWorld(DEFAULT_STICKY_SCREEN_FONT, zoom, 16, 72));
+        const cardW = preset.width;
         const cardH = screenToWorld(DEFAULT_STICKY_SCREEN_HEIGHT, zoom, 40, 200);
         const stickyData = {
           id: crypto.randomUUID(),
@@ -346,7 +347,7 @@ export function activateTool(
           name: '',
           visible: true,
           text: '',
-          fontSize: snapToStickyPreset(screenToWorld(DEFAULT_STICKY_SCREEN_FONT, zoom, 8, 40)),
+          fontSize: preset.fontSize,
           fontFamily: 'Inter, system-ui, sans-serif',
           fill: '#ffd43b',     // default yellow
           textColor: '#1a1a1a',

frontend/src/components/TextFormatToolbar.tsx

@@ -3,7 +3,8 @@ import React, { useState, useRef, useEffect } from 'react';
 type StickyTextSize = 'S' | 'M' | 'L' | 'XL' | 'XXL';
 
 const STICKY_SIZES: StickyTextSize[] = ['S', 'M', 'L', 'XL', 'XXL'];
-const STICKY_SIZE_MAP: Record<StickyTextSize, number> = { S: 10, M: 14, L: 18, XL: 24, XXL: 32 };
+const STICKY_SIZE_MAP: Record<StickyTextSize, number> = { S: 20, M: 28, L: 36, XL: 48, XXL: 60 };
+const STICKY_WIDTH_MAP: Record<StickyTextSize, number> = { S: 200, M: 260, L: 320, XL: 400, XXL: 480 };
 const STICKY_SIZE_VALUES = Object.values(STICKY_SIZE_MAP);
 
 function nearestStickySize(fontSize: number): StickyTextSize {
@@ -16,15 +17,21 @@ function nearestStickySize(fontSize: number): StickyTextSize {
   return best;
 }
 
-/** Snap a raw fontSize to the nearest preset value. */
-export function snapToStickyPreset(fontSize: number): number {
-  let best = STICKY_SIZE_VALUES[0];
+/** Snap a raw fontSize to the nearest preset. Returns { fontSize, width }. */
+export function snapToStickyPreset(fontSize: number): { fontSize: number; width: number } {
+  let best: StickyTextSize = 'M';
   let bestDist = Infinity;
-  for (const v of STICKY_SIZE_VALUES) {
-    const dist = Math.abs(fontSize - v);
-    if (dist < bestDist) { bestDist = dist; best = v; }
+  for (const size of STICKY_SIZES) {
+    const dist = Math.abs(fontSize - STICKY_SIZE_MAP[size]);
+    if (dist < bestDist) { bestDist = dist; best = size; }
   }
-  return best;
+  return { fontSize: STICKY_SIZE_MAP[best], width: STICKY_WIDTH_MAP[best] };
+}
+
+/** Get the width for a given sticky text size preset. */
+export function getStickyWidthForSize(fontSize: number): number {
+  const size = nearestStickySize(fontSize);
+  return STICKY_WIDTH_MAP[size];
 }
 
 interface TextFormatToolbarProps {
@@ -135,9 +142,9 @@ export default function TextFormatToolbar(props: TextFormatToolbarProps) {
               key={size}
               style={{
                 ...btnStyle,
-                width: '26px',
-                padding: 0,
-                fontSize: size === 'S' ? '9px' : size === 'M' ? '10px' : size === 'L' ? '11px' : size === 'XL' ? '12px' : '13px',
+                minWidth: size.length > 2 ? '32px' : '24px',
+                padding: '0 3px',
+                fontSize: '10px',
                 fontWeight: active ? 700 : 400,
                 color: active ? '#fff' : '#666',
                 background: active ? '#333' : 'transparent',
@@ -157,7 +164,7 @@ export default function TextFormatToolbar(props: TextFormatToolbarProps) {
       {/* Font family dropdown */}
       <div style={{ position: 'relative' }}>
         <button
-          style={{ ...btnStyle, maxWidth: '90px', overflow: 'hidden', textOverflow: 'ellipsis' }}
+          style={{ ...btnStyle, maxWidth: '110px', overflow: 'hidden', textOverflow: 'ellipsis' }}
           onClick={(e) => { e.stopPropagation(); setShowFontMenu((v) => !v); setShowColorPicker(false); }}
           title="Font family"
           {...hoverHandlers}

frontend/src/pages/Editor.tsx

@@ -20,7 +20,7 @@ import UserCursors from '../components/UserCursors';
 import ContextMenu from '../components/ContextMenu';
 import LayerPanel from '../components/LayerPanel';
 import SelectionToolbar from '../components/SelectionToolbar';
-import TextFormatToolbar from '../components/TextFormatToolbar';
+import TextFormatToolbar, { getStickyWidthForSize } from '../components/TextFormatToolbar';
 import VideoControls from '../components/VideoControls';
 import ShortcutsHelp from '../components/ShortcutsHelp';
 import MattermostImport from '../components/MattermostImport';
@@ -975,9 +975,11 @@ export default function Editor({ isPublicView }: EditorProps) {
             } : undefined}
             onStickySizeChange={textToolbar.kind === 'sticky' ? (fontSize) => {
               const scene = canvasRef.current?.getScene();
+              const newWidth = getStickyWidthForSize(fontSize);
               for (const item of textToolbar.items) {
                 const d = item.data as StickyObject;
                 d.fontSize = fontSize;
+                d.w = newWidth;
                 if (item.displayObject instanceof StickySprite) {
                   item.displayObject.updateFromData(d);
                   d.h = item.displayObject.computedHeight;