📈 修正趋势图整数刻度对齐

src/components/common/SmoothTrendCanvas.vue

@@ -88,6 +88,16 @@ const INERTIA_DECAY_PER_120HZ_FRAME = 0.96
 const INERTIA_STOP_VELOCITY = 0.01
 const HOVER_EASE_PER_120HZ_FRAME = 0.34
 const HOVER_SNAP_DISTANCE = 0.2
+const getYAxisTicks = (rawMax: number) => {
+  const roundedMax = Math.max(1, Math.ceil(rawMax))
+  if (roundedMax <= 4) {
+    return Array.from({ length: roundedMax + 1 }, (_, index) => roundedMax - index)
+  }
+
+  const step = Math.ceil(roundedMax / 4)
+  const scaleMax = step * Math.ceil(roundedMax / step)
+  return Array.from({ length: scaleMax / step + 1 }, (_, index) => scaleMax - index * step)
+}
 
 const panelClass = computed(() =>
   props.isDarkMode
@@ -167,7 +177,8 @@ const draw = (timestamp = performance.now()) => {
     0,
     ...visible.flatMap((row) => [Number(row.downloads || 0), Number(row.uploads || 0)])
   )
-  const max = rawMax <= 2 ? 3 : Math.ceil(rawMax / 3) * 3
+  const yTicks = getYAxisTicks(rawMax)
+  const max = yTicks[0]
   const muted = props.isDarkMode ? '#9ca3af' : '#6b7280'
   const border = props.isDarkMode ? '#374151' : '#e5e7eb'
   const downloadColor = props.isDarkMode ? '#8fb6c5' : '#5f8fa3'
@@ -177,14 +188,15 @@ const draw = (timestamp = performance.now()) => {
   ctx.lineWidth = 1
   ctx.fillStyle = muted
   ctx.font = '12px system-ui'
-  for (let i = 0; i < 4; i += 1) {
-    const y = padTop + (height * i) / 3
+  const yTickCount = Math.max(1, yTicks.length - 1)
+  yTicks.forEach((tick, index) => {
+    const y = padTop + (height * index) / yTickCount
     ctx.beginPath()
     ctx.moveTo(padLeft, y)
     ctx.lineTo(padLeft + width, y)
     ctx.stroke()
-    ctx.fillText(String(Math.round(max * (1 - i / 3))), 4, y + 4)
-  }
+    ctx.fillText(String(tick), 4, y + 4)
+  })
 
   const denominator = Math.max(1, windowSize.value - 1)
   const plotLeft = padLeft