feat(ui): реализация Canvas-рендеринга и UI для ColorLine98

- Canvas 2D компонент GameBoard.vue:
  - Отрисовка поля 9×9 с сеткой
  - Отрисовка шаров (7 цветов с градиентами)
  - Клик-выделение шара (оранжевая обводка)
  - Клик-перемещение в целевую клетку
  - Панель очков (текущий счёт)
  - Превью следующих 3 шаров (цветные круги)
  - Кнопка "Новая игра"
  - Экран Game Over с финальным счётом

- Обновлён App.vue:
  - Заголовок ColorLine98
  - Градиентный фон
  - Центрированный layout

Refs: [GAM-9](/GAM/issues/GAM-9)

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/App.vue

@@ -1,7 +1,62 @@
+<!--
+@author aevgarik@gmail.com
+@date 2026-03-22
+
+Главный компонент приложения ColorLine98
+-->
+
 <script setup lang="ts">
-import HelloWorld from './components/HelloWorld.vue'
+import GameBoard from './components/GameBoard.vue'
 </script>
 
 <template>
-  <HelloWorld />
+  <div class="app">
+    <header class="app-header">
+      <h1>ColorLine98</h1>
+    </header>
+    <main class="app-main">
+      <GameBoard />
+    </main>
+  </div>
 </template>
+
+<style>
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+body {
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  min-height: 100vh;
+  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+}
+
+.app {
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+}
+
+.app-header {
+  padding: 20px;
+  text-align: center;
+}
+
+.app-header h1 {
+  color: white;
+  font-size: 48px;
+  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
+  letter-spacing: 3px;
+}
+
+.app-main {
+  flex: 1;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 20px;
+}
+</style>

src/components/GameBoard.vue

@@ -0,0 +1,356 @@
+<!--
+@author aevgarik@gmail.com
+@date 2026-03-22
+
+Canvas-компонент игрового поля ColorLine98
+-->
+
+<script setup lang="ts">
+import { ref, onMounted, onUnmounted, watch } from 'vue'
+import { Game, type GameState, type BallColor, BOARD_SIZE, COLORS } from '../game'
+
+const CELL_SIZE = 50
+const BALL_RADIUS = 18
+const BOARD_PADDING = 10
+
+const canvasRef = ref<HTMLCanvasElement | null>(null)
+const game = new Game()
+const state = ref<GameState>(game.getState())
+const selectedPath = ref<{ row: number; col: number }[] | null>(null)
+const animatingBall = ref<{
+  color: BallColor
+  path: { row: number; col: number }[]
+  progress: number
+} | null>(null)
+
+let animationFrame: number | null = null
+
+onMounted(() => {
+  game.subscribe((newState) => {
+    state.value = newState
+    selectedPath.value = null
+  })
+  game.startNewGame()
+  render()
+})
+
+onUnmounted(() => {
+  if (animationFrame) {
+    cancelAnimationFrame(animationFrame)
+  }
+})
+
+watch(
+  state,
+  () => {
+    render()
+  },
+  { deep: true }
+)
+
+function getCanvasSize(): number {
+  return BOARD_SIZE * CELL_SIZE + BOARD_PADDING * 2
+}
+
+function getCellCenter(row: number, col: number): { x: number; y: number } {
+  return {
+    x: BOARD_PADDING + col * CELL_SIZE + CELL_SIZE / 2,
+    y: BOARD_PADDING + row * CELL_SIZE + CELL_SIZE / 2,
+  }
+}
+
+function render(): void {
+  const canvas = canvasRef.value
+  if (!canvas) return
+
+  const ctx = canvas.getContext('2d')
+  if (!ctx) return
+
+  ctx.clearRect(0, 0, canvas.width, canvas.height)
+
+  drawGrid(ctx)
+  drawBalls(ctx)
+  drawSelection(ctx)
+
+  if (animatingBall.value) {
+    drawAnimatingBall(ctx)
+  }
+}
+
+function drawGrid(ctx: CanvasRenderingContext2D): void {
+  ctx.strokeStyle = '#BDC3C7'
+  ctx.lineWidth = 1
+
+  for (let i = 0; i <= BOARD_SIZE; i++) {
+    const pos = BOARD_PADDING + i * CELL_SIZE
+    ctx.beginPath()
+    ctx.moveTo(pos, BOARD_PADDING)
+    ctx.lineTo(pos, BOARD_PADDING + BOARD_SIZE * CELL_SIZE)
+    ctx.stroke()
+
+    ctx.beginPath()
+    ctx.moveTo(BOARD_PADDING, pos)
+    ctx.lineTo(BOARD_PADDING + BOARD_SIZE * CELL_SIZE, pos)
+    ctx.stroke()
+  }
+}
+
+function drawBalls(ctx: CanvasRenderingContext2D): void {
+  for (let row = 0; row < BOARD_SIZE; row++) {
+    for (let col = 0; col < BOARD_SIZE; col++) {
+      const ball = state.value.board[row][col].ball
+      if (ball !== null) {
+        const { x, y } = getCellCenter(row, col)
+        drawBall(ctx, x, y, ball)
+      }
+    }
+  }
+}
+
+function drawBall(ctx: CanvasRenderingContext2D, x: number, y: number, color: BallColor): void {
+  const gradient = ctx.createRadialGradient(x - 5, y - 5, 0, x, y, BALL_RADIUS)
+  gradient.addColorStop(0, lightenColor(COLORS[color], 30))
+  gradient.addColorStop(1, COLORS[color])
+
+  ctx.beginPath()
+  ctx.arc(x, y, BALL_RADIUS, 0, Math.PI * 2)
+  ctx.fillStyle = gradient
+  ctx.fill()
+
+  ctx.strokeStyle = darkenColor(COLORS[color], 20)
+  ctx.lineWidth = 2
+  ctx.stroke()
+}
+
+function drawSelection(ctx: CanvasRenderingContext2D): void {
+  if (!state.value.selectedCell) return
+
+  const { row, col } = state.value.selectedCell
+  const { x, y } = getCellCenter(row, col)
+
+  ctx.beginPath()
+  ctx.arc(x, y, BALL_RADIUS + 3, 0, Math.PI * 2)
+  ctx.strokeStyle = '#F39C12'
+  ctx.lineWidth = 3
+  ctx.stroke()
+}
+
+function drawAnimatingBall(ctx: CanvasRenderingContext2D): void {
+  if (!animatingBall.value) return
+
+  const { path, progress, color } = animatingBall.value
+  const pathIndex = Math.floor(progress)
+  const pathProgress = progress - pathIndex
+
+  if (pathIndex >= path.length - 1) return
+
+  const from = getCellCenter(path[pathIndex].row, path[pathIndex].col)
+  const to = getCellCenter(path[pathIndex + 1].row, path[pathIndex + 1].col)
+
+  const x = from.x + (to.x - from.x) * pathProgress
+  const y = from.y + (to.y - from.y) * pathProgress
+
+  drawBall(ctx, x, y, color)
+}
+
+function lightenColor(hex: string, percent: number): string {
+  const num = parseInt(hex.slice(1), 16)
+  const amt = Math.round(2.55 * percent)
+  const R = Math.min(255, (num >> 16) + amt)
+  const G = Math.min(255, ((num >> 8) & 0x00ff) + amt)
+  const B = Math.min(255, (num & 0x0000ff) + amt)
+  return `#${((1 << 24) | (R << 16) | (G << 8) | B).toString(16).slice(1)}`
+}
+
+function darkenColor(hex: string, percent: number): string {
+  const num = parseInt(hex.slice(1), 16)
+  const amt = Math.round(2.55 * percent)
+  const R = Math.max(0, (num >> 16) - amt)
+  const G = Math.max(0, ((num >> 8) & 0x00ff) - amt)
+  const B = Math.max(0, (num & 0x0000ff) - amt)
+  return `#${((1 << 24) | (R << 16) | (G << 8) | B).toString(16).slice(1)}`
+}
+
+function getCellFromPoint(x: number, y: number): { row: number; col: number } | null {
+  const col = Math.floor((x - BOARD_PADDING) / CELL_SIZE)
+  const row = Math.floor((y - BOARD_PADDING) / CELL_SIZE)
+
+  if (row < 0 || row >= BOARD_SIZE || col < 0 || col >= BOARD_SIZE) {
+    return null
+  }
+
+  return { row, col }
+}
+
+function handleClick(event: MouseEvent): void {
+  if (!canvasRef.value || animatingBall.value) return
+
+  const rect = canvasRef.value.getBoundingClientRect()
+  const x = event.clientX - rect.left
+  const y = event.clientY - rect.top
+
+  const cell = getCellFromPoint(x, y)
+  if (!cell) return
+
+  game.selectCell(cell.row, cell.col)
+}
+
+function startNewGame(): void {
+  if (animatingBall.value) return
+  game.startNewGame()
+}
+</script>
+
+<template>
+  <div class="game-container">
+    <div class="game-header">
+      <div class="score">
+        Счёт: <span class="score-value">{{ state.score }}</span>
+      </div>
+      <div class="next-balls">
+        Следующие:
+        <span
+          v-for="(ball, index) in state.nextBalls"
+          :key="index"
+          class="preview-ball"
+          :style="{ backgroundColor: COLORS[ball] }"
+        />
+      </div>
+    </div>
+
+    <canvas
+      ref="canvasRef"
+      :width="getCanvasSize()"
+      :height="getCanvasSize()"
+      class="game-board"
+      @click="handleClick"
+    />
+
+    <div v-if="state.gameOver" class="game-over">
+      <div class="game-over-content">
+        <h2>Игра окончена!</h2>
+        <p>Ваш счёт: {{ state.score }}</p>
+        <button @click="startNewGame" class="btn">Играть ещё</button>
+      </div>
+    </div>
+
+    <div class="game-controls">
+      <button @click="startNewGame" class="btn">Новая игра</button>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.game-container {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 20px;
+  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+}
+
+.game-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  width: 100%;
+  max-width: 480px;
+  margin-bottom: 20px;
+  padding: 10px 20px;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  border-radius: 10px;
+  color: white;
+}
+
+.score {
+  font-size: 18px;
+  font-weight: bold;
+}
+
+.score-value {
+  font-size: 24px;
+}
+
+.next-balls {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  font-size: 14px;
+}
+
+.preview-ball {
+  width: 20px;
+  height: 20px;
+  border-radius: 50%;
+  border: 2px solid rgba(255, 255, 255, 0.5);
+  box-shadow: inset -2px -2px 4px rgba(0, 0, 0, 0.2);
+}
+
+.game-board {
+  border: 3px solid #34495e;
+  border-radius: 8px;
+  background: #ecf0f1;
+  cursor: pointer;
+  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
+}
+
+.game-over {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background: rgba(0, 0, 0, 0.7);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 100;
+}
+
+.game-over-content {
+  background: white;
+  padding: 40px;
+  border-radius: 15px;
+  text-align: center;
+  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
+}
+
+.game-over-content h2 {
+  color: #e74c3c;
+  margin-bottom: 20px;
+  font-size: 28px;
+}
+
+.game-over-content p {
+  font-size: 20px;
+  margin-bottom: 30px;
+  color: #2c3e50;
+}
+
+.game-controls {
+  margin-top: 20px;
+}
+
+.btn {
+  padding: 12px 30px;
+  font-size: 16px;
+  font-weight: bold;
+  color: white;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  border: none;
+  border-radius: 25px;
+  cursor: pointer;
+  transition:
+    transform 0.2s,
+    box-shadow 0.2s;
+}
+
+.btn:hover {
+  transform: translateY(-2px);
+  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
+}
+
+.btn:active {
+  transform: translateY(0);
+}
+</style>