Add floating windows and btop system monitor

src/lib/btop/simulate.ts

@@ -0,0 +1,26 @@
+export function randomWalk(value: number, step: number, minimum = 0, maximum = 100): number {
+	const next = value + (Math.random() * 2 - 1) * step;
+	return Math.min(maximum, Math.max(minimum, next));
+}
+
+export function usageTone(percent: number): string {
+	if (percent >= 80) return 'red';
+	if (percent >= 50) return 'yellow';
+	return 'green';
+}
+
+export function relativeTime(isoDate: string): string {
+	const elapsedMinutes = Math.floor((Date.now() - new Date(isoDate).getTime()) / 60000);
+	if (elapsedMinutes < 60) return `${elapsedMinutes}m`;
+	const elapsedHours = Math.floor(elapsedMinutes / 60);
+	if (elapsedHours < 24) return `${elapsedHours}h`;
+	const elapsedDays = Math.floor(elapsedHours / 24);
+	if (elapsedDays < 60) return `${elapsedDays}d`;
+	return `${Math.floor(elapsedDays / 30)}mo`;
+}
+
+export function formatSize(sizeKb: number): string {
+	if (sizeKb >= 1024 * 1024) return `${(sizeKb / 1024 / 1024).toFixed(1)}G`;
+	if (sizeKb >= 1024) return `${(sizeKb / 1024).toFixed(1)}M`;
+	return `${sizeKb}K`;
+}