ActivityCharts: smoothing toggle (Raw/10s/20s) for all line chart metrics

site/src/components/ActivityCharts.svelte

@@ -14,10 +14,13 @@
   type Tab = 'elevation' | 'speed' | 'hr' | 'cadence' | 'power';
   type XMode = 'time' | 'distance';
   type ChartType = 'line' | 'histogram';
+  type SmoothMode = 'raw' | '10s' | '20s';
+  const SMOOTH_HALF: Record<SmoothMode, number> = { raw: 0, '10s': 5, '20s': 10 };
 
   let activeTab: Tab = 'elevation';
   let xMode: XMode = 'time';
   let chartType: ChartType = 'line';
+  let smoothMode: SmoothMode = 'raw';
   let chartEl: HTMLDivElement;
   let chart: SVGElement | null = null;
 
@@ -183,7 +186,7 @@
   onDestroy(() => { chart?.remove(); chart = null; themeObserver?.disconnect(); });
 
   $: if (chartEl) {
-    activeTab; xMode; chartType; histData; histThresholds; alignZones;
+    activeTab; xMode; chartType; histData; histThresholds; alignZones; smoothMode;
     renderChart();
   }
 
@@ -228,13 +231,14 @@
     // control points and visual artifacts — use linear instead.
     const curve = xMode === 'distance' ? 'linear' : 'monotone-x';
 
-    // Smooth cadence and power for visual rendering only (±5 s centred window = 11 s).
-    // Raw data is still used for the histogram, reference-line stats, and tooltip.
-    const needsSmooth = activeTab === 'cadence' || activeTab === 'power';
-    const smoothed = needsSmooth
-      ? rollingMean(data.map(d => (d as any)[yKey] as number | null), 5)
-      : null;
-    const lineData = smoothed ? data.map((d, i) => ({ ...d, [yKey]: smoothed[i] })) : data;
+    // Apply smoothing for visual rendering only — raw data still used for stats/histogram.
+    const halfWin = SMOOTH_HALF[smoothMode];
+    const lineData = halfWin > 0
+      ? (() => {
+          const s = rollingMean(data.map(d => (d as any)[yKey] as number | null), halfWin);
+          return data.map((d, i) => ({ ...d, [yKey]: s[i] }));
+        })()
+      : data;
 
     if (activeTab === 'cadence') {
       marks.push(Plot.lineY(lineData, { x, y: yKey, stroke: color, strokeWidth: 1.5, curve }));
@@ -265,9 +269,9 @@
     }
 
     marks.push(
-      Plot.ruleX(data, Plot.pointerX({ x, stroke: tc.rule, strokeWidth: 1, strokeDasharray: '4,4' })),
-      Plot.dot(data,  Plot.pointerX({ x, y: yKey, r: 4, fill: color, stroke: tc.tooltipBg, strokeWidth: 1.5 })),
-      Plot.text(data, Plot.pointerX({
+      Plot.ruleX(lineData, Plot.pointerX({ x, stroke: tc.rule, strokeWidth: 1, strokeDasharray: '4,4' })),
+      Plot.dot(lineData,   Plot.pointerX({ x, y: yKey, r: 4, fill: color, stroke: tc.tooltipBg, strokeWidth: 1.5 })),
+      Plot.text(lineData,  Plot.pointerX({
         x, y: yKey,
         text: (d: any) => d[yKey] != null ? `${Math.round(d[yKey])}` : '',
         dy: -12,
@@ -426,6 +430,21 @@
       </div>
     {/if}
 
+    {#if chartType === 'line'}
+      <div class="flex items-center gap-1">
+        {#each (['raw', '10s', '20s'] as SmoothMode[]) as sm}
+          <button
+            class="px-2 py-1 rounded transition-colors"
+            class:bg-zinc-800={smoothMode === sm}
+            class:text-white={smoothMode === sm}
+            class:hover:text-zinc-300={smoothMode !== sm}
+            on:click={() => smoothMode = sm}
+            title="Smoothing window"
+          >{sm === 'raw' ? '~ Raw' : sm}</button>
+        {/each}
+      </div>
+    {/if}
+
     <div class="flex items-center gap-1">
       {#each (['line', 'histogram'] as ChartType[]) as type}
         <button