foundation: project guide, tooling, design tokens, bilingual shell and routing contracts

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/components/dot-background/dot-background.ts

@@ -1,6 +1,14 @@
-import {afterNextRender, Component, ElementRef, NgZone, OnDestroy, ViewChild} from '@angular/core';
-import {Dot} from '../../models/dot';
-import {DeviceDetectionService} from '../../service/device-detection-service';
+import {
+  afterNextRender,
+  Component,
+  ElementRef,
+  inject,
+  NgZone,
+  OnDestroy,
+  ViewChild,
+} from '@angular/core';
+import { isBrowserPlatform, prefersCoarsePointer } from '../../core/platform/browser';
+import { Dot } from '../../models/dot';
 
 @Component({
   selector: 'app-dot-background',
@@ -11,7 +19,10 @@ import {DeviceDetectionService} from '../../service/device-detection-service';
 export class DotBackground implements OnDestroy {
   @ViewChild('canvas') canvasRef!: ElementRef<HTMLCanvasElement>;
 
-  private ctx!: CanvasRenderingContext2D;
+  private readonly ngZone = inject(NgZone);
+  private readonly coarsePointer = prefersCoarsePointer();
+
+  private ctx: CanvasRenderingContext2D | undefined;
   private dots: Dot[] = [];
   private mouse = { x: -1000, y: -1000 };
   private animationId = 0;
@@ -26,23 +37,41 @@ export class DotBackground implements OnDestroy {
   private ballSpawnId = 0;
   private ballSpawnNextColor = 0;
 
-  constructor(private ngZone: NgZone, private mobileService: DeviceDetectionService) {
+  constructor() {
     afterNextRender(() => {
       this.init();
     });
   }
 
   ngOnDestroy() {
-    if (!this.initialized) return;
+    if (!this.initialized) {
+      return;
+    }
 
     cancelAnimationFrame(this.animationId);
-    window.removeEventListener('resize', this.resize);
-    window.removeEventListener('mousemove', this.onMouseMove);
+
+    if (isBrowserPlatform()) {
+      window.removeEventListener('resize', this.resize);
+      window.removeEventListener('mousemove', this.onMouseMove);
+      window.removeEventListener('click', this.onMouseClick);
+    }
   }
 
   private init() {
     const canvas = this.canvasRef.nativeElement;
-    this.ctx = canvas.getContext('2d')!;
+    let ctx: CanvasRenderingContext2D | null = null;
+
+    try {
+      ctx = canvas.getContext('2d');
+    } catch {
+      return;
+    }
+
+    if (!ctx) {
+      return;
+    }
+
+    this.ctx = ctx;
     this.resize();
     this.initDots();
 
@@ -62,8 +91,7 @@ export class DotBackground implements OnDestroy {
     const dx = Math.abs(width - canvas.width) / width;
     const dy = Math.abs(height - canvas.height) / height;
 
-    if (!this.mobileService.mobileCheck() || dy > 0.2 || dx > 0.05) {
-      //sync canvas size to screen size
+    if (!this.coarsePointer || dy > 0.2 || dx > 0.05) {
       canvas.width = width;
       canvas.height = height;
 
@@ -74,13 +102,10 @@ export class DotBackground implements OnDestroy {
     }
   };
 
-
-
   private onMouseMove = (e: MouseEvent) => {
     const canvas = this.canvasRef.nativeElement;
-    // map real res to canvas res
-    this.mouse.x = e.clientX / window.innerWidth * canvas.width;
-    this.mouse.y = e.clientY / window.innerHeight * canvas.height;
+    this.mouse.x = (e.clientX / window.innerWidth) * canvas.width;
+    this.mouse.y = (e.clientY / window.innerHeight) * canvas.height;
   };
 
   private onMouseClick = () => {
@@ -91,16 +116,17 @@ export class DotBackground implements OnDestroy {
 
   private spawnDot(): Dot {
     const dotId = this.ballSpawnId++;
-    const max_count = this.mobileService.mobileCheck() ? this.MAX_DOT_COUNT_MOBILE : this.MAX_DOT_COUNT;
-    let dot;
-    if (dotId < max_count) {
+    const maxCount = this.coarsePointer ? this.MAX_DOT_COUNT_MOBILE : this.MAX_DOT_COUNT;
+    let dot: Dot;
+
+    if (dotId < maxCount) {
       dot = {
         x: 0,
         y: 0,
         vx: 0,
         vy: 0,
         radius: 1,
-        color: "#000000",
+        color: '#000000',
       };
 
       this.dots.push(dot);
@@ -114,7 +140,7 @@ export class DotBackground implements OnDestroy {
   }
 
   private populateDot(dot: Dot) {
-    const {width, height} = this.canvasRef.nativeElement;
+    const { width, height } = this.canvasRef.nativeElement;
 
     dot.x = Math.random() * width;
     dot.y = Math.random() * height;
@@ -132,8 +158,14 @@ export class DotBackground implements OnDestroy {
 
   private animate = () => {
     const canvas = this.canvasRef.nativeElement;
+    const ctx = this.ctx;
+
+    if (!ctx) {
+      return;
+    }
+
     const { width, height } = canvas;
-    this.ctx.clearRect(0, 0, width, height);
+    ctx.clearRect(0, 0, width, height);
 
     for (const dot of this.dots) {
       const dx = dot.x - this.mouse.x;
@@ -161,25 +193,24 @@ export class DotBackground implements OnDestroy {
         dot.vy = Math.random() * 0.2 - 0.1;
       }
 
-      // Bounce off edges (accounting for radius)
-      if (dot.x < dot.radius || dot.x > width - dot.radius) dot.vx *= -1;
-      if (dot.y < dot.radius || dot.y > height - dot.radius) dot.vy *= -1;
+      if (dot.x < dot.radius || dot.x > width - dot.radius) {
+        dot.vx *= -1;
+      }
+      if (dot.y < dot.radius || dot.y > height - dot.radius) {
+        dot.vy *= -1;
+      }
 
-      // Clamp to bounds
       dot.x = Math.max(dot.radius, Math.min(width - dot.radius, dot.x));
       dot.y = Math.max(dot.radius, Math.min(height - dot.radius, dot.y));
 
-      const gradient = this.ctx.createRadialGradient(
-        dot.x, dot.y, 0,
-        dot.x, dot.y, dot.radius
-      );
+      const gradient = ctx.createRadialGradient(dot.x, dot.y, 0, dot.x, dot.y, dot.radius);
       gradient.addColorStop(0, dot.color + '40');
       gradient.addColorStop(1, 'transparent');
 
-      this.ctx.beginPath();
-      this.ctx.arc(dot.x, dot.y, dot.radius, 0, Math.PI * 2);
-      this.ctx.fillStyle = gradient;
-      this.ctx.fill();
+      ctx.beginPath();
+      ctx.arc(dot.x, dot.y, dot.radius, 0, Math.PI * 2);
+      ctx.fillStyle = gradient;
+      ctx.fill();
     }
 
     this.animationId = requestAnimationFrame(this.animate);