feat(ui): 记录页月份联动与多项 UI 美化/修复

- records: 底部列表与月份选择器联动，新增 [本月|最近] 分段控件；标题/空态随模式切换
- leaderboard: 领奖台布局(冠军居中+皇冠)、次数标注于底座且三档水平对齐；头像 cloud:// 批量预解析提速(云函数需重新部署)
- index/timer: 主色底图标改白色变体修复隐形；目标数字按微信字体缩放补偿真机遮挡
- settings: 配色方案横滑渐变色卡；头像上传前压缩至 200px
- theme: 新增 teal 主题；暗黑背景统一对齐
- 圆形头像双保险(image 自身 border-radius)修复月/年榜方图

注: cloudfunctions/leaderboard 改动须在开发者工具重新部署才生效。

components/progress-ring/progress-ring.js

@@ -28,7 +28,7 @@ Component({
       })
     },
 
-    'remaining, duration, size, ringWidth, primaryColor, trackColor'() {
+    'remaining, duration, size, ringWidth, primaryColor, primaryLightColor, trackColor'() {
       this._draw()
     }
   },
@@ -53,11 +53,19 @@ Component({
   },
 
   methods: {
+    // '#FF6B35' -> [255, 107, 53]
+    _hexToRgb(hex) {
+      const m = /^#?([0-9a-f]{6})$/i.exec(hex || '')
+      if (!m) return [255, 107, 53]
+      const n = parseInt(m[1], 16)
+      return [(n >> 16) & 255, (n >> 8) & 255, n & 255]
+    },
+
     _draw() {
       const ctx = this._ctx
       if (!ctx) return
 
-      const { size, ringWidth, duration, remaining, primaryColor, trackColor } = this.data
+      const { size, ringWidth, duration, remaining, primaryColor, primaryLightColor, trackColor } = this.data
       const dpr = this._dpr
 
       const w = size * dpr
@@ -66,7 +74,9 @@ Component({
 
       const cx = w / 2
       const cy = h / 2
-      const radius = (size - ringWidth) / 2 * dpr
+      // reserve room for the glowing end dot so its shadow isn't clipped
+      const glowPad = 6 * dpr
+      const radius = (size - ringWidth) / 2 * dpr - glowPad
       const lw = ringWidth * dpr
 
       // track ring
@@ -81,13 +91,52 @@ Component({
       const ratio = duration > 0 ? Math.max(0, Math.min(1, remaining / duration)) : 0
       if (ratio > 0.001) {
         const startAngle = -Math.PI / 2
-        const endAngle = startAngle + ratio * Math.PI * 2
+        const sweep = ratio * Math.PI * 2
+        const [r1, g1, b1] = this._hexToRgb(primaryColor)
+        const [r2, g2, b2] = this._hexToRgb(primaryLightColor || primaryColor)
+
+        // Conic gradient along the arc (light -> primary), drawn as small
+        // arc segments. Segment count is bounded so per-frame redraws stay cheap.
+        const segs = Math.max(16, Math.min(120, Math.ceil(sweep / 0.06)))
+        for (let i = 0; i < segs; i++) {
+          const a0 = startAngle + (sweep * i) / segs
+          const a1 = startAngle + (sweep * (i + 1)) / segs + 0.004 // tiny overlap to hide seams
+          const t = 1 - i / (segs - 1) // head (i=0, oldest remaining) is primary, tail is light
+          const r = Math.round(r1 + (r2 - r1) * t)
+          const g = Math.round(g1 + (g2 - g1) * t)
+          const b = Math.round(b1 + (b2 - b1) * t)
+          ctx.beginPath()
+          ctx.arc(cx, cy, radius, a0, a1)
+          ctx.strokeStyle = `rgb(${r},${g},${b})`
+          ctx.lineWidth = lw
+          ctx.lineCap = 'butt'
+          ctx.stroke()
+        }
+
+        // round cap at the tail (12 o'clock side)
         ctx.beginPath()
-        ctx.arc(cx, cy, radius, startAngle, endAngle)
-        ctx.strokeStyle = primaryColor
-        ctx.lineWidth = lw
-        ctx.lineCap = 'round'
-        ctx.stroke()
+        ctx.arc(cx + radius * Math.cos(startAngle), cy + radius * Math.sin(startAngle), lw / 2, 0, Math.PI * 2)
+        ctx.fillStyle = `rgb(${r2},${g2},${b2})`
+        ctx.fill()
+
+        // glowing dot at the leading end
+        const endAngle = startAngle + sweep
+        const ex = cx + radius * Math.cos(endAngle)
+        const ey = cy + radius * Math.sin(endAngle)
+        ctx.save()
+        ctx.shadowColor = primaryColor
+        ctx.shadowBlur = 12 * dpr
+        ctx.beginPath()
+        ctx.arc(ex, ey, lw / 2, 0, Math.PI * 2)
+        ctx.fillStyle = primaryColor
+        ctx.fill()
+        // white core for a "light bulb" feel
+        ctx.shadowBlur = 0
+        ctx.beginPath()
+        ctx.arc(ex, ey, lw / 4, 0, Math.PI * 2)
+        ctx.fillStyle = 'rgba(255,255,255,0.9)'
+        ctx.fill()
+        ctx.restore()
       }
     }
   }