sparkline: remove maxSamples, remove bar gaps, always fill width from data

shell/applets/BatteryApplet.qml

@@ -96,7 +96,6 @@ Column {
         history: S.BatteryService.history
         color: root._stateColor
         active: root.active
-        maxSamples: 1440
         backgroundTint: 0.07
         areaMode: true
         thresholds: [
@@ -163,7 +162,6 @@ Column {
         history: S.BatteryService.rateHistory
         color: root._stateColor
         active: root.active
-        maxSamples: 60
         maxValue: null
         minValue: null
         backgroundTint: 0.08

shell/applets/GpuApplet.qml

@@ -84,7 +84,6 @@ Column {
         height: 36
         history: S.SystemStats.gpuHistory
         active: root.active
-        maxSamples: 60
         colorFunction: v => S.Theme.loadColor(v)
     }
 

shell/applets/MemoryApplet.qml

@@ -80,7 +80,6 @@ Column {
         history: S.SystemStats.memHistory
         color: root.accentColor
         active: root.active
-        maxSamples: 30
         backgroundTint: 0.15
     }
 

shell/applets/SparklineCanvas.qml

@@ -13,9 +13,6 @@ Canvas {
     readonly property real _max: maxValue !== null && maxValue !== undefined ? maxValue : (history.length ? Math.max(...history) : 100)
     readonly property real _min: minValue !== null && minValue !== undefined ? minValue : (history.length ? Math.min(...history) : 0)
 
-    // Max x-axis slots - bars get narrower as data fills up, then oldest drops off
-    property int maxSamples: 0
-
     // Logarithmic x-axis: compresses old data on the left, expands recent data on the right.
     // logCurve controls strength (0 = linear, 3 = strong compression). Only visual - does not affect data.
     property bool logScale: false
@@ -69,9 +66,8 @@ Canvas {
                 const x1 = width * (Math.exp(k * (i + 1) / n) - 1) / expK;
                 return [x0, x1 - x0];
             }
-            const step = width / (maxSamples > n ? maxSamples : n);
-            const off = maxSamples > n ? (maxSamples - n) * step : 0;
-            return [off + i * step, step];
+            const step = width / n;
+            return [i * step, step];
         }
 
         // Background tint
@@ -149,7 +145,7 @@ Canvas {
                 const dy = yOf(d[i]);
                 const barTop = Math.min(dy, zy);
                 const barH = Math.max(1, Math.abs(dy - zy));
-                ctx.fillRect(bx, barTop, Math.max(1, bw - 0.5), barH);
+                ctx.fillRect(bx, barTop, Math.ceil(bw), barH);
             }
         }
     }

shell/applets/TemperatureApplet.qml

@@ -113,7 +113,6 @@ Column {
         history: root.history
         color: root.stateColor
         active: root.active
-        maxSamples: 150
         backgroundTint: 0.08
         thresholds: [
             {