fix(sticky): make size presets absolute again

frontend/src/canvas/stickyPresets.ts

@@ -1,9 +1,8 @@
 /**
  * stickyPresets — sticky note size presets (shared domain module).
  *
- * Presets are defined in screen-space so they preserve the same visual intent
- * regardless of viewport zoom. Scene data still stores world-space width and
- * fontSize; callers convert through the helpers below.
+ * Presets are absolute semantic sizes. Zoom changes the camera/view only; it
+ * must not change what S/M/L/XL/XXL mean for an existing sticky.
  */
 
 export type StickyTextSize = 'S' | 'M' | 'L' | 'XL' | 'XXL';
@@ -36,37 +35,3 @@ export function nearestStickySize(fontSize: number): StickyTextSize {
 export function getStickyWidthForSize(fontSize: number): number {
   return STICKY_WIDTH_MAP[nearestStickySize(fontSize)];
 }
-
-/**
- * Convert a preset's screen-space target to world-space sticky metrics.
- * objectScale is included so old non-1 scaled stickies still respond
- * predictably when a preset is applied.
- */
-export function getStickyWorldMetricsForPreset(
-  preset: StickyTextSize,
-  zoom: number,
-  objectScale: number = 1,
-): { fontSize: number; width: number } {
-  const safeZoom = Math.max(zoom, 0.001);
-  const safeScale = Math.max(Math.abs(objectScale), 0.001);
-  return {
-    fontSize: STICKY_FONT_MAP[preset] / (safeZoom * safeScale),
-    width: STICKY_WIDTH_MAP[preset] / (safeZoom * safeScale),
-  };
-}
-
-/**
- * Convert a desired on-screen font size into world-space sticky metrics by
- * snapping to the nearest preset first.
- */
-export function getStickyWorldMetricsForScreenFont(
-  screenFontSize: number,
-  zoom: number,
-  objectScale: number = 1,
-): { fontSize: number; width: number; preset: StickyTextSize } {
-  const preset = nearestStickySize(screenFontSize);
-  return {
-    ...getStickyWorldMetricsForPreset(preset, zoom, objectScale),
-    preset,
-  };
-}

frontend/src/canvas/tools.ts

@@ -13,7 +13,7 @@ import { DrawingSprite } from './sprites/DrawingSprite';
 import type { DrawingObject } from './scene-format';
 import { TextEditor } from './TextEditor';
 import { clampTextFontSize } from './textLimits';
-import { DEFAULT_STICKY_PRESET, getStickyWorldMetricsForPreset } from './stickyPresets';
+import { DEFAULT_STICKY_PRESET, STICKY_FONT_MAP, STICKY_WIDTH_MAP } from './stickyPresets';
 
 export enum ToolType {
   SELECT = 'SELECT',
@@ -323,10 +323,8 @@ export function activateTool(
         const rect = container.getBoundingClientRect();
         const world = viewport.toWorld(e.clientX - rect.left, e.clientY - rect.top);
 
-        const zoom = viewport.scale.x;
-        const presetMetrics = getStickyWorldMetricsForPreset(DEFAULT_STICKY_PRESET, zoom);
-        const cardW = presetMetrics.width;
-        const cardH = screenToWorld(60, zoom, 40, 200);
+        const cardW = STICKY_WIDTH_MAP[DEFAULT_STICKY_PRESET];
+        const cardH = 60; // auto-computed by StickySprite
         const stickyData = {
           id: crypto.randomUUID(),
           type: 'sticky' as const,
@@ -343,7 +341,7 @@ export function activateTool(
           name: '',
           visible: true,
           text: '',
-          fontSize: presetMetrics.fontSize,
+          fontSize: STICKY_FONT_MAP[DEFAULT_STICKY_PRESET],
           fontFamily: 'Inter, system-ui, sans-serif',
           fill: '#ffd43b',     // default yellow
           textColor: '#1a1a1a',