fix: shorten dashboard labels to "Burned" and "Covered"

Values already include units (kcal, km), so verbose labels were redundant.
Remove unused distance_covered i18n key.

src/lib/js/fitnessI18n.ts

@@ -72,8 +72,9 @@ const translations: Translations = {
 	workouts_plural: { en: 'Workouts', de: 'Trainings' },
 	lifted: { en: 'Lifted', de: 'Gehoben' },
 	est_kcal: { en: 'Est. kcal', de: 'Gesch. kcal' },
+	burned: { en: 'Burned', de: 'Verbrannt' },
 	kcal_set_profile: { en: 'Set sex & height in', de: 'Geschlecht & Grösse unter' },
-	distance_covered: { en: 'Distance Covered', de: 'Zurückgelegt' },
+	covered: { en: 'Covered', de: 'Zurückgelegt' },
 	workouts_per_week: { en: 'Workouts per week', de: 'Trainings pro Woche' },
 	sex: { en: 'Sex', de: 'Geschlecht' },
 	male: { en: 'Male', de: 'Männlich' },

src/routes/api/fitness/sessions/[id]/recalculate/+server.ts

@@ -40,7 +40,9 @@ export const POST: RequestHandler = async ({ params, locals }) => {
 		// Recompute totalVolume and totalDistance
 		let totalVolume = 0;
 		let totalDistance = 0;
-		for (const ex of workoutSession.exercises) {
+		const gpsPreviewUpdates: Record<string, number[][]> = {};
+		for (let i = 0; i < workoutSession.exercises.length; i++) {
+			const ex = workoutSession.exercises[i];
 			const exercise = getExerciseById(ex.exerciseId);
 			const metrics = getExerciseMetrics(exercise);
 			const isCardio = metrics.includes('distance');
@@ -56,7 +58,7 @@ export const POST: RequestHandler = async ({ params, locals }) => {
 
 			// Regenerate gpsPreview from gpsTrack if present
 			if (ex.gpsTrack && ex.gpsTrack.length >= 2) {
-				ex.gpsPreview = simplifyTrack(ex.gpsTrack);
+				gpsPreviewUpdates[`exercises.${i}.gpsPreview`] = simplifyTrack(ex.gpsTrack);
 			}
 		}
 
@@ -120,15 +122,20 @@ export const POST: RequestHandler = async ({ params, locals }) => {
 			}
 		}
 
-		workoutSession.totalVolume = totalVolume > 0 ? totalVolume : undefined;
-		workoutSession.totalDistance = totalDistance > 0 ? totalDistance : undefined;
-		workoutSession.prs = prs.length > 0 ? prs : undefined;
-		await workoutSession.save();
+		// Use $set to only update computed fields, preserving gpsTrack data
+		await WorkoutSession.updateOne({ _id: workoutSession._id }, {
+			$set: {
+				totalVolume: totalVolume > 0 ? totalVolume : undefined,
+				totalDistance: totalDistance > 0 ? totalDistance : undefined,
+				prs: prs.length > 0 ? prs : undefined,
+				...gpsPreviewUpdates
+			}
+		});
 
 		return json({
-			totalVolume: workoutSession.totalVolume,
-			totalDistance: workoutSession.totalDistance,
-			prs: workoutSession.prs?.length ?? 0
+			totalVolume: totalVolume > 0 ? totalVolume : undefined,
+			totalDistance: totalDistance > 0 ? totalDistance : undefined,
+			prs: prs.length
 		});
 	} catch (error) {
 		console.error('Error recalculating session:', error);

src/routes/fitness/[stats=fitnessStats]/+page.svelte

@@ -145,7 +145,7 @@
 			<div class="lifetime-card kcal">
 				<div class="card-icon"><Flame size={24} /></div>
 				<div class="card-value">~{stats.kcalEstimate.kcal.toLocaleString()}<span class="card-unit">kcal</span></div>
-				<div class="card-label">{t('est_kcal', lang)}</div>
+				<div class="card-label">{t('burned', lang)}</div>
 				{#if !hasDemographics}
 					<div class="card-hint">{t('kcal_set_profile', lang)} <a href="/fitness/{fitnessSlugs(lang).measure}">{t('measure_title', lang)}</a></div>
 				{/if}
@@ -154,7 +154,7 @@
 		<div class="lifetime-card cardio">
 			<div class="card-icon"><Route size={24} /></div>
 			<div class="card-value">{stats.totalCardioKm ?? 0}<span class="card-unit">km</span></div>
-			<div class="card-label">{t('distance_covered', lang)}</div>
+			<div class="card-label">{t('covered', lang)}</div>
 		</div>
 	</div>