feat: better notification storage and image caching + blobs

Components/LineGraph.qml

@@ -55,6 +55,21 @@ Item {
 			return ZUtils.snap(v, canvas);
 		}
 
+		// A value is plottable only if it is a real number. Everything else -
+		// null, undefined, NaN, an unparsable string from the API - is a hole, so
+		// the series splits there. Non-finite coordinates must never reach the
+		// path: one NaN lineTo makes the canvas ignore the rest of the curve, and
+		// the fill then runs from whatever y it last had straight down.
+		function numeric(v) {
+			if (typeof v === "number")
+				return Number.isFinite(v) ? v : null;
+			if (typeof v === "string") {
+				const n = Number(v);
+				return Number.isFinite(n) ? n : null;
+			}
+			return null;
+		}
+
 		function strokeCurve(ctx, pts) {
 			ctx.beginPath();
 			ctx.moveTo(pts[0].x, pts[0].y);
@@ -230,7 +245,8 @@ Item {
 			if (loAuto || hiAuto) {
 				let dmin = Infinity;
 				let dmax = -Infinity;
-				for (const v of root.values) {
+				for (const value of root.values) {
+					const v = numeric(value);
 					if (v == null)
 						continue;
 					if (v < dmin)
@@ -272,7 +288,7 @@ Item {
 			if (range <= 0 || root.xSteps < 1)
 				return;
 
-			let series = root.values;
+			let series = root.values.map(v => numeric(v));
 			if (root.smoothing > 0 && series.length > 0) {
 				const radius = Math.round(root.smoothing);
 				const raw = series;