Add normalized difficulty versus moving duration to analytics

Extend analytics with a second scatter plotting Cotacol per 100 km against
moving hours, keep speed versus Cotacol as first chart, render both
canvases from shared points, open ride detail in a new tab on dot click,
and keep all website copy in English.

1 files changed, 8 insertions, 0 deletions

diff --git a/web/frontend/analytics-logic.ts b/web/frontend/analytics-logic.ts
index 7a53944..e8a1559 100644
--- a/web/frontend/analytics-logic.ts
+++ b/web/frontend/analytics-logic.ts
@@ -33,3 +33,11 @@ const roundStep = (value: number): number => {
 export const formatSpeed = (speed: number): string => `${speed.toFixed(1)}`;
 
 export const formatCotacol = (cotacol: number): string => (cotacol >= 100 ? `${Math.round(cotacol)}` : `${cotacol.toFixed(1)}`);
+
+export const formatHours = (hours: number): string => {
+  if (hours < 1) return `${Math.round(hours * 60)}m`;
+  const h = Math.floor(hours);
+  const m = Math.round((hours - h) * 60);
+  if (m === 0) return `${h}h`;
+  return `${h}h${String(m).padStart(2, "0")}`;
+};