chore: release v0.1.0.62

Stellt sicher, dass die Fehlermeldung angezeigt wird, bevor
promptPushAfterInviteCreated zurückkehrt.

Co-authored-by: Cursor <cursoragent@cursor.com>

VERSION

@@ -1 +1 @@
-0.1.0.59
+0.1.0.63

client/src/App.css

@@ -3068,6 +3068,98 @@ html.theme-cupertino .events-scroll-container {
   }
 }
 
+.tank-liter-input .tank-liter-slider {
+  --tank-slider-track-h: 10px;
+  --tank-slider-thumb: 26px;
+  width: 100%;
+  height: var(--tank-slider-thumb);
+  margin: 10px 0 6px;
+  padding: 0;
+  -webkit-appearance: none;
+  appearance: none;
+  background: transparent;
+  accent-color: #4ade80;
+  cursor: pointer;
+  touch-action: none;
+}
+
+.tank-liter-input .tank-liter-slider::-webkit-slider-runnable-track {
+  height: var(--tank-slider-track-h);
+  border-radius: 999px;
+  background: rgba(148, 163, 184, 0.35);
+}
+
+.tank-liter-input .tank-liter-slider::-webkit-slider-thumb {
+  -webkit-appearance: none;
+  width: var(--tank-slider-thumb);
+  height: var(--tank-slider-thumb);
+  margin-top: calc((var(--tank-slider-track-h) - var(--tank-slider-thumb)) / 2);
+  border-radius: 50%;
+  background: #4ade80;
+  border: 2px solid rgba(15, 23, 42, 0.85);
+  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
+}
+
+.tank-liter-input .tank-liter-slider::-moz-range-track {
+  height: var(--tank-slider-track-h);
+  border-radius: 999px;
+  background: rgba(148, 163, 184, 0.35);
+}
+
+.tank-liter-input .tank-liter-slider::-moz-range-thumb {
+  width: var(--tank-slider-thumb);
+  height: var(--tank-slider-thumb);
+  border-radius: 50%;
+  background: #4ade80;
+  border: 2px solid rgba(15, 23, 42, 0.85);
+  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
+}
+
+.tank-liter-input .tank-liter-slider:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.tank-liter-input .tank-liter-slider-hint {
+  font-size: 0.75rem;
+  color: #94a3b8;
+  margin-bottom: 6px;
+  text-align: center;
+}
+
+@media (max-width: 480px) {
+  .tank-liter-input .tank-liter-slider {
+    --tank-slider-track-h: 12px;
+    --tank-slider-thumb: 32px;
+    margin: 12px 0 8px;
+  }
+}
+
+.vessel-tanks-section {
+  grid-column: 1 / -1;
+  margin-top: 8px;
+  padding-top: 16px;
+  border-top: 1px solid rgba(148, 163, 184, 0.2);
+}
+
+.vessel-tanks-section h3 {
+  font-size: 1rem;
+  margin: 0 0 4px;
+  color: #e2e8f0;
+}
+
+.vessel-tanks-help {
+  font-size: 0.85rem;
+  color: #94a3b8;
+  margin: 0 0 12px;
+}
+
+.vessel-tanks-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
+  gap: 12px;
+}
+
 /* GPS Track Upload & Map Styling */
 .track-upload-zone {
   display: flex;

client/src/components/DemoViewer.tsx

@@ -31,7 +31,9 @@ export default function DemoViewer({ onExit }: DemoViewerProps) {
     registerNavigation({
       setActiveTab,
       setSelectedEntryId: setTourSelectedEntryId,
-      setFeedbackOpen: () => {}
+      setFeedbackOpen: () => {},
+      setLogbookActive: () => {},
+      setProfileOpen: () => {}
     })
     registerDemoTourContext({ firstEntryId: fixture.firstEntryId })
 

client/src/components/LogEntryEditor.tsx

@@ -42,6 +42,14 @@ import {
 import { computeTrackStats, formatTrackStats } from '../utils/trackStats.js'
 import { computeFuelPerMotorHour, formatFuelPerMotorHour } from '../utils/fuelStats.js'
 import { useRegisterUnsavedChanges } from '../context/UnsavedChangesContext.tsx'
+import TankLiterInput from './TankLiterInput.tsx'
+import {
+  computeEveningTankMaxLiters,
+  computeRefilledTankMaxLiters,
+  extractTankCapacitiesFromYacht,
+  formatTankLitersForInput,
+  type VesselTankCapacities
+} from '../utils/tankCapacity.js'
 
 function emptyTankLevels() {
   return { morning: 0, refilled: 0, evening: 0, consumption: 0 }
@@ -50,6 +58,7 @@ function emptyTankLevels() {
 function fingerprintFromStoredEntry(decrypted: Record<string, unknown>): string {
   const fw = (decrypted.freshwater as Record<string, number> | undefined) ?? emptyTankLevels()
   const fuel = (decrypted.fuel as Record<string, number> | undefined) ?? emptyTankLevels()
+  const gw = decrypted.greywater as { level?: number } | undefined
   const trackDistance = decrypted.trackDistanceNm
   const trackSpeedMax = decrypted.trackSpeedMaxKn
   const trackSpeedAvg = decrypted.trackSpeedAvgKn
@@ -72,6 +81,7 @@ function fingerprintFromStoredEntry(decrypted: Record<string, unknown>): string
       evening: fuel.evening || 0,
       consumption: fuel.consumption ?? 0
     },
+    greywater: gw ? { level: gw.level || 0 } : undefined,
     trackDistanceNm:
       trackDistance != null && trackDistance !== ''
         ? parseFloat(String(trackDistance))
@@ -145,6 +155,9 @@ export default function LogEntryEditor({
   const [fuelEvening, setFuelEvening] = useState('0')
   const [fuelConsumption, setFuelConsumption] = useState('0')
 
+  const [greywaterLevel, setGreywaterLevel] = useState('0')
+  const [tankCapacities, setTankCapacities] = useState<VesselTankCapacities>({})
+
   // Signatures
   const [signSkipper, setSignSkipper] = useState<SignatureValue | ''>('')
   const [signCrew, setSignCrew] = useState<SignatureValue | ''>('')
@@ -249,6 +262,7 @@ export default function LogEntryEditor({
         evening: parseFloat(fuelEvening) || 0,
         consumption: parseFloat(fuelConsumption) || 0
       },
+      greywater: { level: parseFloat(greywaterLevel) || 0 },
       trackDistanceNm: trackDistanceNm.trim() ? parseFloat(trackDistanceNm) : undefined,
       trackSpeedMaxKn: trackSpeedMaxKn.trim() ? parseFloat(trackSpeedMaxKn) : undefined,
       trackSpeedAvgKn: trackSpeedAvgKn.trim() ? parseFloat(trackSpeedAvgKn) : undefined,
@@ -259,6 +273,7 @@ export default function LogEntryEditor({
     date, dayOfTravel, departure, destination,
     fwMorning, fwRefilled, fwEvening, fwConsumption,
     fuelMorning, fuelRefilled, fuelEvening, fuelConsumption,
+    greywaterLevel,
     trackDistanceNm, trackSpeedMaxKn, trackSpeedAvgKn, motorHours,
     events
   ])
@@ -268,6 +283,38 @@ export default function LogEntryEditor({
     [fuelConsumption, motorHours]
   )
 
+  const tankCapacityTooltip = t('logs.tank_capacity_tooltip')
+
+  const fwRefilledMax = useMemo(
+    () => computeRefilledTankMaxLiters(fwMorning, tankCapacities.freshwaterCapacityL),
+    [fwMorning, tankCapacities.freshwaterCapacityL]
+  )
+
+  const fwEveningMax = useMemo(
+    () =>
+      computeEveningTankMaxLiters(
+        fwMorning,
+        fwRefilled,
+        tankCapacities.freshwaterCapacityL
+      ),
+    [fwMorning, fwRefilled, tankCapacities.freshwaterCapacityL]
+  )
+
+  const fuelRefilledMax = useMemo(
+    () => computeRefilledTankMaxLiters(fuelMorning, tankCapacities.fuelCapacityL),
+    [fuelMorning, tankCapacities.fuelCapacityL]
+  )
+
+  const fuelEveningMax = useMemo(
+    () =>
+      computeEveningTankMaxLiters(
+        fuelMorning,
+        fuelRefilled,
+        tankCapacities.fuelCapacityL
+      ),
+    [fuelMorning, fuelRefilled, tankCapacities.fuelCapacityL]
+  )
+
   const currentFingerprint = useMemo(() => {
     const payload = buildPayloadForSigning()
     return JSON.stringify({
@@ -527,11 +574,59 @@ export default function LogEntryEditor({
     setFuelConsumption(cons >= 0 ? String(cons) : '0')
   }, [fuelMorning, fuelRefilled, fuelEvening])
 
-  // Load Yacht Sails
+  const fwRefilledNoCapacity =
+    (tankCapacities.freshwaterCapacityL ?? 0) > 0 && fwRefilledMax == null
+  const fuelRefilledNoCapacity =
+    (tankCapacities.fuelCapacityL ?? 0) > 0 && fuelRefilledMax == null
+
   useEffect(() => {
-    async function loadYachtSails() {
-      if (readOnly && preloadedYacht?.sails) {
-        setYachtSails(preloadedYacht.sails)
+    const refilled = parseFloat(fwRefilled) || 0
+    if (fwRefilledMax == null) {
+      if (fwRefilledNoCapacity && refilled > 0) {
+        setFwRefilled(formatTankLitersForInput(0))
+      }
+      return
+    }
+    if (refilled > fwRefilledMax) {
+      setFwRefilled(formatTankLitersForInput(fwRefilledMax))
+    }
+  }, [fwRefilledMax, fwRefilled, fwRefilledNoCapacity])
+
+  useEffect(() => {
+    if (fwEveningMax == null) return
+    const evening = parseFloat(fwEvening) || 0
+    if (evening > fwEveningMax) {
+      setFwEvening(formatTankLitersForInput(fwEveningMax))
+    }
+  }, [fwEveningMax, fwEvening])
+
+  useEffect(() => {
+    const refilled = parseFloat(fuelRefilled) || 0
+    if (fuelRefilledMax == null) {
+      if (fuelRefilledNoCapacity && refilled > 0) {
+        setFuelRefilled(formatTankLitersForInput(0))
+      }
+      return
+    }
+    if (refilled > fuelRefilledMax) {
+      setFuelRefilled(formatTankLitersForInput(fuelRefilledMax))
+    }
+  }, [fuelRefilledMax, fuelRefilled, fuelRefilledNoCapacity])
+
+  useEffect(() => {
+    if (fuelEveningMax == null) return
+    const evening = parseFloat(fuelEvening) || 0
+    if (evening > fuelEveningMax) {
+      setFuelEvening(formatTankLitersForInput(fuelEveningMax))
+    }
+  }, [fuelEveningMax, fuelEvening])
+
+  // Load yacht sails and tank capacities
+  useEffect(() => {
+    async function loadYachtMeta() {
+      if (readOnly && preloadedYacht) {
+        if (preloadedYacht.sails) setYachtSails(preloadedYacht.sails)
+        setTankCapacities(extractTankCapacitiesFromYacht(preloadedYacht))
         return
       }
       try {
@@ -541,16 +636,19 @@ export default function LogEntryEditor({
         const yacht = await db.yachts.get(logbookId)
         if (yacht) {
           const decrypted = await decryptJson(yacht.encryptedData, yacht.iv, yacht.tag, masterKey)
-          if (decrypted && decrypted.sails && Array.isArray(decrypted.sails)) {
-            setYachtSails(decrypted.sails)
+          if (decrypted) {
+            if (decrypted.sails && Array.isArray(decrypted.sails)) {
+              setYachtSails(decrypted.sails)
+            }
+            setTankCapacities(extractTankCapacitiesFromYacht(decrypted))
           }
         }
       } catch (err) {
-        console.error('Failed to load yacht sails in editor:', err)
+        console.error('Failed to load yacht meta in editor:', err)
       }
     }
-    loadYachtSails()
-  }, [logbookId, preloadedYacht])
+    loadYachtMeta()
+  }, [logbookId, preloadedYacht, readOnly])
 
   // Load entry details
   useEffect(() => {
@@ -580,6 +678,11 @@ export default function LogEntryEditor({
             setFuelEvening(String(preloadedEntry.fuel.evening || 0))
             setFuelConsumption(String(preloadedEntry.fuel.consumption ?? 0))
           }
+          if (preloadedEntry.greywater) {
+            setGreywaterLevel(String(preloadedEntry.greywater.level || 0))
+          } else {
+            setGreywaterLevel('0')
+          }
 
           setSignSkipper(normalizeSignature(preloadedEntry.signSkipper) || '')
           setSignCrew(normalizeSignature(preloadedEntry.signCrew) || '')
@@ -613,6 +716,11 @@ export default function LogEntryEditor({
               setFuelEvening(String(decrypted.fuel.evening || 0))
               setFuelConsumption(String(decrypted.fuel.consumption ?? 0))
             }
+            if (decrypted.greywater) {
+              setGreywaterLevel(String(decrypted.greywater.level || 0))
+            } else {
+              setGreywaterLevel('0')
+            }
 
             setSignSkipper(normalizeSignature(decrypted.signSkipper) || '')
             setSignCrew(normalizeSignature(decrypted.signCrew) || '')
@@ -1210,41 +1318,35 @@ export default function LogEntryEditor({
               <h3>{t('logs.freshwater')}</h3>
             </div>
             <div className="consumption-grid">
+              <TankLiterInput
+                id="fw-morning"
+                label={t('logs.morning')}
+                value={fwMorning}
+                onChange={setFwMorning}
+                maxLiters={tankCapacities.freshwaterCapacityL}
+                disabled={saving || readOnly}
+                titleTooltip={tankCapacityTooltip}
+              />
+              <TankLiterInput
+                id="fw-refilled"
+                label={t('logs.refilled')}
+                value={fwRefilled}
+                onChange={setFwRefilled}
+                maxLiters={fwRefilledMax}
+                disabled={saving || readOnly || fwRefilledNoCapacity}
+                titleTooltip={tankCapacityTooltip}
+              />
+              <TankLiterInput
+                id="fw-evening"
+                label={t('logs.evening')}
+                value={fwEvening}
+                onChange={setFwEvening}
+                maxLiters={fwEveningMax}
+                disabled={saving || readOnly}
+                titleTooltip={tankCapacityTooltip}
+              />
               <div className="input-group">
-                <label>{t('logs.morning')}</label>
-                <input
-                  type="number"
-                  className="input-text"
-                  value={fwMorning}
-                  onChange={(e) => setFwMorning(e.target.value)}
-                  disabled={saving || readOnly}
-                />
-              </div>
-
-              <div className="input-group">
-                <label>{t('logs.refilled')}</label>
-                <input
-                  type="number"
-                  className="input-text"
-                  value={fwRefilled}
-                  onChange={(e) => setFwRefilled(e.target.value)}
-                  disabled={saving || readOnly}
-                />
-              </div>
-
-              <div className="input-group">
-                <label>{t('logs.evening')}</label>
-                <input
-                  type="number"
-                  className="input-text"
-                  value={fwEvening}
-                  onChange={(e) => setFwEvening(e.target.value)}
-                  disabled={saving || readOnly}
-                />
-              </div>
-
-              <div className="input-group">
-                <label>{t('logs.consumption')} (L)</label>
+                <label title={tankCapacityTooltip}>{t('logs.consumption')} (L)</label>
                 <input
                   type="number"
                   className="input-text consumption-value"
@@ -1252,6 +1354,7 @@ export default function LogEntryEditor({
                   readOnly
                   tabIndex={-1}
                   aria-readonly="true"
+                  title={tankCapacityTooltip}
                 />
               </div>
             </div>
@@ -1264,41 +1367,35 @@ export default function LogEntryEditor({
               <h3>{t('logs.fuel')}</h3>
             </div>
             <div className="consumption-grid">
+              <TankLiterInput
+                id="fuel-morning"
+                label={t('logs.morning')}
+                value={fuelMorning}
+                onChange={setFuelMorning}
+                maxLiters={tankCapacities.fuelCapacityL}
+                disabled={saving || readOnly}
+                titleTooltip={tankCapacityTooltip}
+              />
+              <TankLiterInput
+                id="fuel-refilled"
+                label={t('logs.refilled')}
+                value={fuelRefilled}
+                onChange={setFuelRefilled}
+                maxLiters={fuelRefilledMax}
+                disabled={saving || readOnly || fuelRefilledNoCapacity}
+                titleTooltip={tankCapacityTooltip}
+              />
+              <TankLiterInput
+                id="fuel-evening"
+                label={t('logs.evening')}
+                value={fuelEvening}
+                onChange={setFuelEvening}
+                maxLiters={fuelEveningMax}
+                disabled={saving || readOnly}
+                titleTooltip={tankCapacityTooltip}
+              />
               <div className="input-group">
-                <label>{t('logs.morning')}</label>
-                <input
-                  type="number"
-                  className="input-text"
-                  value={fuelMorning}
-                  onChange={(e) => setFuelMorning(e.target.value)}
-                  disabled={saving || readOnly}
-                />
-              </div>
-
-              <div className="input-group">
-                <label>{t('logs.refilled')}</label>
-                <input
-                  type="number"
-                  className="input-text"
-                  value={fuelRefilled}
-                  onChange={(e) => setFuelRefilled(e.target.value)}
-                  disabled={saving || readOnly}
-                />
-              </div>
-
-              <div className="input-group">
-                <label>{t('logs.evening')}</label>
-                <input
-                  type="number"
-                  className="input-text"
-                  value={fuelEvening}
-                  onChange={(e) => setFuelEvening(e.target.value)}
-                  disabled={saving || readOnly}
-                />
-              </div>
-
-              <div className="input-group">
-                <label>{t('logs.consumption')} (L)</label>
+                <label title={tankCapacityTooltip}>{t('logs.consumption')} (L)</label>
                 <input
                   type="number"
                   className="input-text consumption-value"
@@ -1306,11 +1403,12 @@ export default function LogEntryEditor({
                   readOnly
                   tabIndex={-1}
                   aria-readonly="true"
+                  title={tankCapacityTooltip}
                 />
               </div>
 
               <div className="input-group">
-                <label>{t('logs.fuel_per_motor_hour')}</label>
+                <label title={tankCapacityTooltip}>{t('logs.fuel_per_motor_hour')}</label>
                 <input
                   type="text"
                   className="input-text consumption-value"
@@ -1322,10 +1420,30 @@ export default function LogEntryEditor({
                   readOnly
                   tabIndex={-1}
                   aria-readonly="true"
+                  title={tankCapacityTooltip}
                 />
               </div>
             </div>
           </div>
+
+          {/* Greywater card */}
+          <div className="form-card">
+            <div className="form-header">
+              <Compass size={20} className="form-icon" />
+              <h3>{t('logs.greywater')}</h3>
+            </div>
+            <div className="consumption-grid">
+              <TankLiterInput
+                id="greywater-level"
+                label={t('logs.greywater_level')}
+                value={greywaterLevel}
+                onChange={setGreywaterLevel}
+                maxLiters={tankCapacities.greywaterCapacityL}
+                disabled={saving || readOnly}
+                titleTooltip={tankCapacityTooltip}
+              />
+            </div>
+          </div>
         </div>
 
         {/* Section 3: Event Journal Entries */}

client/src/components/SettingsForm.tsx

@@ -6,6 +6,12 @@ import LogbookBackupPanel from './LogbookBackupPanel.tsx'
 import { useDialog } from './ModalDialog.tsx'
 import { PlausibleEvents, trackPlausibleEvent } from '../services/analytics.js'
 import { apiFetch } from '../services/api.js'
+import {
+  enableCollaboratorChangePush,
+  isCollaboratorPushActive,
+  isPushSupported
+} from '../services/pushNotifications.js'
+import { isIosDevice, isRunningStandalone } from '../hooks/usePwaInstall.js'
 
 interface SettingsFormProps {
   logbookId?: string | null
@@ -151,6 +157,43 @@ export default function SettingsForm({ logbookId, onLogbookRestored }: SettingsF
     }
   }
 
+  const promptPushAfterInviteCreated = async () => {
+    if (!isPushSupported()) return
+    if (await isCollaboratorPushActive()) return
+
+    const iosNeedsInstall = isIosDevice() && !isRunningStandalone()
+
+    if (iosNeedsInstall) {
+      await showAlert(
+        t('settings.invite_push_prompt_ios_message'),
+        t('settings.invite_push_prompt_title'),
+        t('settings.invite_push_prompt_later')
+      )
+      return
+    }
+
+    const enable = await showConfirm(
+      t('settings.invite_push_prompt_message'),
+      t('settings.invite_push_prompt_title'),
+      t('settings.invite_push_prompt_enable'),
+      t('settings.invite_push_prompt_later')
+    )
+
+    if (!enable) return
+
+    try {
+      await enableCollaboratorChangePush()
+      await showAlert(
+        t('settings.invite_push_prompt_success'),
+        t('settings.invite_push_prompt_title')
+      )
+      trackPlausibleEvent(PlausibleEvents.PUSH_ENABLED)
+    } catch (err: unknown) {
+      console.error('Failed to enable push after invite:', err)
+      await showAlert(err instanceof Error ? err.message : t('profile.push_error'))
+    }
+  }
+
   const handleGenerateInvite = async () => {
     if (!logbookId) return
     setGeneratingInvite(true)
@@ -175,6 +218,7 @@ export default function SettingsForm({ logbookId, onLogbookRestored }: SettingsF
 
       setInviteLink(link)
       trackPlausibleEvent(PlausibleEvents.INVITE_GENERATED)
+      await promptPushAfterInviteCreated()
     } catch (err: unknown) {
       console.error('Failed to generate invite:', err)
       showAlert(err instanceof Error ? err.message : 'Failed to generate invite link.')

client/src/components/TankLiterInput.tsx

@@ -0,0 +1,103 @@
+import React, { useCallback } from 'react'
+import { useTranslation } from 'react-i18next'
+import { clampTankLiters } from '../utils/tankCapacity.js'
+
+interface TankLiterInputProps {
+  id?: string
+  label: string
+  value: string
+  onChange: (value: string) => void
+  maxLiters?: number
+  disabled?: boolean
+  titleTooltip?: string
+}
+
+function parseInputLiters(value: string): number {
+  const trimmed = value.trim().replace(',', '.')
+  if (!trimmed) return 0
+  const parsed = Number(trimmed)
+  return Number.isFinite(parsed) ? parsed : 0
+}
+
+export default function TankLiterInput({
+  id,
+  label,
+  value,
+  onChange,
+  maxLiters,
+  disabled = false,
+  titleTooltip
+}: TankLiterInputProps) {
+  const { t } = useTranslation()
+  const useSlider = maxLiters != null && maxLiters > 0
+
+  const emitValue = useCallback(
+    (liters: number) => {
+      const clamped = clampTankLiters(liters, useSlider ? maxLiters : undefined)
+      const str =
+        Number.isInteger(clamped) ? String(clamped) : String(Number(clamped.toFixed(1)))
+      onChange(str)
+    },
+    [onChange, maxLiters, useSlider]
+  )
+
+  const handleNumberChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    onChange(e.target.value)
+  }
+
+  const handleNumberBlur = () => {
+    if (!useSlider) return
+    emitValue(parseInputLiters(value))
+  }
+
+  const handleSliderChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    emitValue(Number(e.target.value))
+  }
+
+  const numericValue = parseInputLiters(value)
+  const sliderValue = useSlider ? clampTankLiters(numericValue, maxLiters) : 0
+
+  return (
+    <div className="input-group tank-liter-input">
+      <label htmlFor={id} title={titleTooltip}>{label}</label>
+      {useSlider && (
+        <>
+          <input
+            type="range"
+            className="tank-liter-slider"
+            min={0}
+            max={maxLiters}
+            step={1}
+            value={sliderValue}
+            onChange={handleSliderChange}
+            disabled={disabled}
+            title={titleTooltip}
+            aria-valuemin={0}
+            aria-valuemax={maxLiters}
+            aria-valuenow={sliderValue}
+            aria-label={label}
+          />
+          <div className="tank-liter-slider-hint" aria-hidden="true">
+            {t('logs.tank_slider_of_max', {
+              current: sliderValue,
+              max: maxLiters
+            })}
+          </div>
+        </>
+      )}
+      <input
+        id={id}
+        type="number"
+        className="input-text"
+        value={value}
+        onChange={handleNumberChange}
+        onBlur={handleNumberBlur}
+        disabled={disabled}
+        min={0}
+        max={useSlider ? maxLiters : undefined}
+        step="any"
+        title={titleTooltip}
+      />
+    </div>
+  )
+}

client/src/components/VesselForm.tsx

@@ -7,6 +7,7 @@ import { encryptJson, decryptJson } from '../services/crypto.js'
 import { syncLogbook } from '../services/sync.js'
 import { PlausibleEvents, trackPlausibleEvent } from '../services/analytics.js'
 import { Ship, Save, Check, Plus, X, Camera, Trash2 } from 'lucide-react'
+import { parseOptionalTankLiters, tankCapacityInputFromStored } from '../utils/tankCapacity.js'
 
 interface VesselFormProps {
   logbookId: string
@@ -47,6 +48,9 @@ export default function VesselForm({ logbookId, readOnly = false, preloadedData
   const [mmsi, setMmsi] = useState('')
   const [sails, setSails] = useState<string[]>([])
   const [newSailName, setNewSailName] = useState('')
+  const [freshwaterCapacityL, setFreshwaterCapacityL] = useState('')
+  const [fuelCapacityL, setFuelCapacityL] = useState('')
+  const [greywaterCapacityL, setGreywaterCapacityL] = useState('')
 
   const fileInputRef = React.useRef<HTMLInputElement>(null)
   const [photo, setPhoto] = useState<string | null>(null)
@@ -78,6 +82,9 @@ export default function VesselForm({ logbookId, readOnly = false, preloadedData
           setMmsi(preloadedData.mmsi || '')
           setSails(preloadedData.sails || [])
           setPhoto(preloadedData.photo || null)
+          setFreshwaterCapacityL(tankCapacityInputFromStored(preloadedData.freshwaterCapacityL))
+          setFuelCapacityL(tankCapacityInputFromStored(preloadedData.fuelCapacityL))
+          setGreywaterCapacityL(tankCapacityInputFromStored(preloadedData.greywaterCapacityL))
           return
         }
 
@@ -103,6 +110,9 @@ export default function VesselForm({ logbookId, readOnly = false, preloadedData
             setMmsi(decrypted.mmsi || '')
             setSails(decrypted.sails || [])
             setPhoto(decrypted.photo || null)
+            setFreshwaterCapacityL(tankCapacityInputFromStored(decrypted.freshwaterCapacityL))
+            setFuelCapacityL(tankCapacityInputFromStored(decrypted.fuelCapacityL))
+            setGreywaterCapacityL(tankCapacityInputFromStored(decrypted.greywaterCapacityL))
           }
         }
       } catch (err: any) {
@@ -201,12 +211,19 @@ export default function VesselForm({ logbookId, readOnly = false, preloadedData
       let parsedLengthM: number | undefined
       let parsedDraftM: number | undefined
       let parsedAirDraftM: number | undefined
+      let parsedFreshwaterCapacityL: number | undefined
+      let parsedFuelCapacityL: number | undefined
+      let parsedGreywaterCapacityL: number | undefined
       try {
         parsedLengthM = parseOptionalMetricMeters(lengthM)
         parsedDraftM = parseOptionalMetricMeters(draftM)
         parsedAirDraftM = parseOptionalMetricMeters(airDraftM)
-      } catch {
-        setError(t('vessel.invalid_metric'))
+        parsedFreshwaterCapacityL = parseOptionalTankLiters(freshwaterCapacityL)
+        parsedFuelCapacityL = parseOptionalTankLiters(fuelCapacityL)
+        parsedGreywaterCapacityL = parseOptionalTankLiters(greywaterCapacityL)
+      } catch (err: unknown) {
+        const msg = err instanceof Error ? err.message : ''
+        setError(msg === 'invalid_tank_liters' ? t('vessel.invalid_tank_liters') : t('vessel.invalid_metric'))
         setSaving(false)
         return
       }
@@ -217,6 +234,9 @@ export default function VesselForm({ logbookId, readOnly = false, preloadedData
         lengthM: parsedLengthM,
         draftM: parsedDraftM,
         airDraftM: parsedAirDraftM,
+        freshwaterCapacityL: parsedFreshwaterCapacityL,
+        fuelCapacityL: parsedFuelCapacityL,
+        greywaterCapacityL: parsedGreywaterCapacityL,
         homePort: homePort.trim(),
         charterCompany: charterCompany.trim(),
         owner: owner.trim(),
@@ -480,6 +500,49 @@ export default function VesselForm({ logbookId, readOnly = false, preloadedData
             />
           </div>
 
+          <div className="vessel-tanks-section">
+            <h3>{t('vessel.tanks_section')}</h3>
+            <p className="vessel-tanks-help">{t('vessel.tanks_help')}</p>
+            <div className="vessel-tanks-grid">
+              <div className="input-group">
+                <label>{t('vessel.freshwater_capacity_l')}</label>
+                <input
+                  type="text"
+                  inputMode="decimal"
+                  className="input-text"
+                  value={freshwaterCapacityL}
+                  onChange={(e) => setFreshwaterCapacityL(e.target.value)}
+                  disabled={saving || readOnly}
+                  placeholder="0"
+                />
+              </div>
+              <div className="input-group">
+                <label>{t('vessel.fuel_capacity_l')}</label>
+                <input
+                  type="text"
+                  inputMode="decimal"
+                  className="input-text"
+                  value={fuelCapacityL}
+                  onChange={(e) => setFuelCapacityL(e.target.value)}
+                  disabled={saving || readOnly}
+                  placeholder="0"
+                />
+              </div>
+              <div className="input-group">
+                <label>{t('vessel.greywater_capacity_l')}</label>
+                <input
+                  type="text"
+                  inputMode="decimal"
+                  className="input-text"
+                  value={greywaterCapacityL}
+                  onChange={(e) => setGreywaterCapacityL(e.target.value)}
+                  disabled={saving || readOnly}
+                  placeholder="0"
+                />
+              </div>
+            </div>
+          </div>
+
           <div className="sails-section">
             <h3>{t('vessel.sails_list')}</h3>
             <p className="help-text">{t('vessel.sails_help')}</p>

client/src/i18n/locales/de.json

@@ -117,7 +117,13 @@
       "no_sails": "Keine Segel hinterlegt.",
       "photo_add": "Foto hinzufügen",
       "photo_change": "Foto ändern",
-      "photo_delete": "Foto löschen"
+      "photo_delete": "Foto löschen",
+      "tanks_section": "Tanks (Fassungsvermögen)",
+      "tanks_help": "Optional in Liter — ermöglicht Slider im Journal bei bekannten Tankgrößen.",
+      "freshwater_capacity_l": "Trinkwasser (Liter)",
+      "fuel_capacity_l": "Treibstoff (Liter)",
+      "greywater_capacity_l": "Grauwasser (Liter)",
+      "invalid_tank_liters": "Ungültiger Zahlenwert — bitte Liter als Zahl eingeben (z. B. 200)."
     },
     "logs": {
       "title": "Logbuch-Journal",
@@ -138,6 +144,10 @@
       "route": "Reise von/nach",
       "freshwater": "Frischwasser (Liter)",
       "fuel": "Treibstoff / Fuel (Liter)",
+      "greywater": "Grauwasser (Liter)",
+      "greywater_level": "Füllstand",
+      "tank_slider_of_max": "{{current}} / {{max}} L",
+      "tank_capacity_tooltip": "Wenn in den Schiffsdaten die Tank-Fassungsvermögen (Liter) hinterlegt sind, kannst du Füllstände hier per Slider eingeben.",
       "morning": "Stand morgens",
       "refilled": "Nachgefüllt",
       "evening": "Stand abends",
@@ -472,6 +482,12 @@
       "delete_account_failed": "Konto konnte nicht gelöscht werden. Bitte versuche es erneut.",
       "delete_backup_hint": "Tipp: Erstelle vor dem Löschen Backups deiner Logbücher (.daagbok.json) in den Einstellungen jedes Logbuchs.",
       "deleting_account": "Konto wird gelöscht…",
+      "invite_push_prompt_title": "Push-Benachrichtigungen aktivieren?",
+      "invite_push_prompt_message": "Sobald eingeladene Crewmitglieder Änderungen synchronisieren, kannst du per Push informiert werden. Es werden keine Logbuch-Inhalte im Klartext gesendet.",
+      "invite_push_prompt_ios_message": "Sobald Crewmitglieder Änderungen synchronisieren, kannst du per Push informiert werden. Auf dem iPhone/iPad: App zum Home-Bildschirm hinzufügen (iOS 16.4+), dann Push im Benutzerprofil aktivieren.",
+      "invite_push_prompt_enable": "Jetzt aktivieren",
+      "invite_push_prompt_later": "Später",
+      "invite_push_prompt_success": "Push-Benachrichtigungen sind auf diesem Gerät aktiv.",
       "backup_title": "Backup & Wiederherstellung",
       "backup_desc": "Vollständiges verschlüsseltes Backup dieses Logbuchs (Einträge, Fotos, GPS-Tracks, Crew, Schiff). Mit Backup-Passphrase geschützt — für Restore auf diesem oder einem neuen Account.",
       "backup_export_title": "Backup erstellen",

client/src/i18n/locales/en.json

@@ -117,7 +117,13 @@
       "no_sails": "No sails defined.",
       "photo_add": "Add Photo",
       "photo_change": "Change Photo",
-      "photo_delete": "Delete Photo"
+      "photo_delete": "Delete Photo",
+      "tanks_section": "Tanks (capacity)",
+      "tanks_help": "Optional, in liters — enables sliders in the journal when tank sizes are known.",
+      "freshwater_capacity_l": "Freshwater (liters)",
+      "fuel_capacity_l": "Fuel (liters)",
+      "greywater_capacity_l": "Greywater (liters)",
+      "invalid_tank_liters": "Invalid number — please enter capacity in liters (e.g. 200)."
     },
     "logs": {
       "title": "Logbook Journal",
@@ -138,6 +144,10 @@
       "route": "Route / Journey",
       "freshwater": "Freshwater (Liters)",
       "fuel": "Fuel (Liters)",
+      "greywater": "Greywater (Liters)",
+      "greywater_level": "Fill level",
+      "tank_slider_of_max": "{{current}} / {{max}} L",
+      "tank_capacity_tooltip": "If tank capacities (liters) are set in vessel master data, you can enter fill levels here using sliders.",
       "morning": "Morning Level",
       "refilled": "Refilled",
       "evening": "Evening Level",
@@ -472,6 +482,12 @@
       "delete_account_failed": "Failed to delete account. Please try again.",
       "delete_backup_hint": "Tip: Before deleting, create backups of your logbooks (.daagbok.json) in each logbook's settings.",
       "deleting_account": "Deleting account…",
+      "invite_push_prompt_title": "Enable push notifications?",
+      "invite_push_prompt_message": "When invited crew members sync changes, you can be notified via push. No logbook content is sent in plain text.",
+      "invite_push_prompt_ios_message": "When crew members sync changes, you can get push notifications. On iPhone/iPad: add the app to your Home Screen (iOS 16.4+), then enable push in your user profile.",
+      "invite_push_prompt_enable": "Enable now",
+      "invite_push_prompt_later": "Later",
+      "invite_push_prompt_success": "Push notifications are active on this device.",
       "backup_title": "Backup & restore",
       "backup_desc": "Full encrypted backup of this logbook (entries, photos, GPS tracks, crew, vessel). Protected with a backup passphrase — restore on this or a new account.",
       "backup_export_title": "Create backup",

client/src/services/csvExport.ts

@@ -88,6 +88,7 @@ export async function exportLogbookToCsv(logbookId: string, preloadedData?: { ya
     'Latitude', 'Longitude', 'Remarks',
     'Freshwater Morning (L)', 'Freshwater Refilled (L)', 'Freshwater Evening (L)', 'Freshwater Consumption (L)',
     'Fuel Morning (L)', 'Fuel Refilled (L)', 'Fuel Evening (L)', 'Fuel Consumption (L)',
+    'Greywater Level (L)',
     'Yacht Name', 'Home Port', 'Owner', 'Charter Company', 'Registration', 'Callsign', 'ATIS', 'MMSI'
   ];
 
@@ -123,6 +124,7 @@ export async function exportLogbookToCsv(logbookId: string, preloadedData?: { ya
     const fuelR = entry.fuel?.refilled ?? '';
     const fuelE = entry.fuel?.evening ?? '';
     const fuelCons = entry.fuel?.consumption ?? '';
+    const greywaterLevel = entry.greywater?.level ?? '';
 
     const eventsList = entry.events || [];
     if (eventsList.length === 0) {
@@ -137,6 +139,7 @@ export async function exportLogbookToCsv(logbookId: string, preloadedData?: { ya
         '', '', '',
         fwM, fwR, fwE, fwCons,
         fuelM, fuelR, fuelE, fuelCons,
+        greywaterLevel,
         yachtName, homePort, owner, charter, registration, callsign, atis, mmsi
       ].map(escapeCsvValue));
     } else {
@@ -153,6 +156,7 @@ export async function exportLogbookToCsv(logbookId: string, preloadedData?: { ya
           ev.gpsLat || '', ev.gpsLng || '', ev.remarks || '',
           fwM, fwR, fwE, fwCons,
           fuelM, fuelR, fuelE, fuelCons,
+          greywaterLevel,
           yachtName, homePort, owner, charter, registration, callsign, atis, mmsi
         ].map(escapeCsvValue));
       }

client/src/services/demoLogbookData.ts

@@ -26,6 +26,7 @@ export interface DemoDaySpec {
   filename: string
   freshwater: { morning: number; refilled: number; evening: number; consumption: number }
   fuel: { morning: number; refilled: number; evening: number; consumption: number }
+  greywaterLevel?: number
   motorHours?: number
   events: Array<Record<string, string>>
 }
@@ -69,6 +70,7 @@ export function buildDemoDays(): DemoDaySpec[] {
       filename: 'kiel-laboe.gpx',
       freshwater: { morning: 120, refilled: 0, evening: 105, consumption: 15 },
       fuel: { morning: 85, refilled: 0, evening: 78, consumption: 7 },
+      greywaterLevel: 25,
       events: [
         {
           time: '10:15',
@@ -101,6 +103,7 @@ export function buildDemoDays(): DemoDaySpec[] {
       filename: 'laboe-damp.gpx',
       freshwater: { morning: 105, refilled: 25, evening: 110, consumption: 20 },
       fuel: { morning: 78, refilled: 0, evening: 70, consumption: 8 },
+      greywaterLevel: 38,
       motorHours: 1.5,
       events: [
         {
@@ -134,6 +137,7 @@ export function buildDemoDays(): DemoDaySpec[] {
       filename: 'damp-schleimuende.gpx',
       freshwater: { morning: 110, refilled: 0, evening: 95, consumption: 15 },
       fuel: { morning: 70, refilled: 15, evening: 80, consumption: 5 },
+      greywaterLevel: 52,
       events: [
         {
           time: '08:30',
@@ -176,7 +180,10 @@ export function buildDemoYachtData(): Record<string, unknown> {
     atis: '',
     mmsi: '',
     sails: isDe ? ['Großsegel', 'Genua', 'Spinnaker'] : ['Mainsail', 'Genoa', 'Spinnaker'],
-    photo: null
+    photo: null,
+    freshwaterCapacityL: 200,
+    fuelCapacityL: 100,
+    greywaterCapacityL: 80
   }
 }
 
@@ -244,6 +251,10 @@ export function buildPublicDemoFixture(): PublicDemoFixture {
       events: day.events
     }
 
+    if (day.greywaterLevel != null && day.greywaterLevel > 0) {
+      entryPayload.greywater = { level: day.greywaterLevel }
+    }
+
     if (stats) {
       entryPayload.trackDistanceNm = stats.distanceNm
       entryPayload.trackSpeedMaxKn = stats.speedMaxKn
@@ -303,6 +314,10 @@ export function buildDemoEntryPayloads(): Array<{
       events: day.events
     }
 
+    if (day.greywaterLevel != null && day.greywaterLevel > 0) {
+      entryPayload.greywater = { level: day.greywaterLevel }
+    }
+
     if (stats) {
       entryPayload.trackDistanceNm = stats.distanceNm
       entryPayload.trackSpeedMaxKn = stats.speedMaxKn

client/src/services/pdfExport.ts

@@ -197,13 +197,15 @@ export async function generateLogbookPagePdf(logbookId: string, entryId: string,
   doc.text('VERBRAUCHSWERTE / CONSUMPTON STATS', 10, footerY + 3);
 
   let fwY = footerY + 5;
-  doc.rect(10, fwY, 110, rowHeight * 3, 'S');
+  const tankRows = 4;
+  doc.rect(10, fwY, 110, rowHeight * tankRows, 'S');
   doc.line(10, fwY + rowHeight, 120, fwY + rowHeight);
   doc.line(10, fwY + rowHeight * 2, 120, fwY + rowHeight * 2);
-  doc.line(40, fwY, 40, fwY + rowHeight * 3);
-  doc.line(60, fwY, 60, fwY + rowHeight * 3);
-  doc.line(80, fwY, 80, fwY + rowHeight * 3);
-  doc.line(100, fwY, 100, fwY + rowHeight * 3);
+  doc.line(10, fwY + rowHeight * 3, 120, fwY + rowHeight * 3);
+  doc.line(40, fwY, 40, fwY + rowHeight * tankRows);
+  doc.line(60, fwY, 60, fwY + rowHeight * tankRows);
+  doc.line(80, fwY, 80, fwY + rowHeight * tankRows);
+  doc.line(100, fwY, 100, fwY + rowHeight * tankRows);
 
   doc.setFont('Helvetica', 'bold');
   doc.setFontSize(7.5);
@@ -226,6 +228,12 @@ export async function generateLogbookPagePdf(logbookId: string, entryId: string,
   doc.text(String(entry.fuel?.evening ?? '0'), 81, fwY + rowHeight * 2 + 4.2);
   doc.text(String(entry.fuel?.consumption ?? '0'), 101, fwY + rowHeight * 2 + 4.2);
 
+  doc.text('Grauwasser', 11, fwY + rowHeight * 3 + 4.2);
+  doc.text('—', 41, fwY + rowHeight * 3 + 4.2);
+  doc.text('—', 61, fwY + rowHeight * 3 + 4.2);
+  doc.text(String(entry.greywater?.level ?? '0'), 81, fwY + rowHeight * 3 + 4.2);
+  doc.text('—', 101, fwY + rowHeight * 3 + 4.2);
+
   // Signatures Box
   let sigX = 130;
   let sigY = footerY + 5;

client/src/services/pushNotifications.ts

@@ -43,6 +43,18 @@ async function fetchVapidPublicKey(): Promise<string | null> {
   }
 }
 
+/** True when crew-change push is enabled and notification permission is granted. */
+export async function isCollaboratorPushActive(): Promise<boolean> {
+  if (!isPushSupported()) return false
+  if (getNotificationPermission() !== 'granted') return false
+  try {
+    const prefs = await fetchPushPrefs()
+    return prefs.collaboratorChangesEnabled
+  } catch {
+    return false
+  }
+}
+
 export async function fetchPushPrefs(): Promise<{ collaboratorChangesEnabled: boolean }> {
   if (!localStorage.getItem('active_userid')) {
     return { collaboratorChangesEnabled: false }

client/src/utils/logEntryPayload.test.ts

@@ -1,5 +1,6 @@
 import { describe, expect, it } from 'vitest'
 import {
+  buildLogEntryPayload,
   hasUnsavedEventDraft,
   isLogEventDraftEmpty,
   normalizeLogEvent,
@@ -40,3 +41,25 @@ describe('logEntryPayload event drafts', () => {
     expect(hasUnsavedEventDraft(filledDraft(), 0, events)).toBe(false)
   })
 })
+
+describe('buildLogEntryPayload greywater', () => {
+  const base = {
+    date: '2026-05-31',
+    dayOfTravel: '1',
+    departure: 'Kiel',
+    destination: 'Laboe',
+    freshwater: { morning: 0, refilled: 0, evening: 0, consumption: 0 },
+    fuel: { morning: 0, refilled: 0, evening: 0, consumption: 0 },
+    events: [] as LogEventPayload[]
+  }
+
+  it('includes greywater when level > 0', () => {
+    const payload = buildLogEntryPayload({ ...base, greywater: { level: 45 } })
+    expect(payload.greywater).toEqual({ level: 45 })
+  })
+
+  it('omits greywater when level is 0', () => {
+    const payload = buildLogEntryPayload({ ...base, greywater: { level: 0 } })
+    expect(payload.greywater).toBeUndefined()
+  })
+})

client/src/utils/logEntryPayload.ts

@@ -144,6 +144,7 @@ export interface LogEntryPayloadInput {
   destination: string
   freshwater: { morning: number; refilled: number; evening: number; consumption: number }
   fuel: { morning: number; refilled: number; evening: number; consumption: number }
+  greywater?: { level: number }
   trackDistanceNm?: number
   trackSpeedMaxKn?: number
   trackSpeedAvgKn?: number
@@ -169,5 +170,12 @@ export function buildLogEntryPayload(input: LogEntryPayloadInput): Record<string
     payload.motorHours = Number(input.motorHours.toFixed(2))
   }
 
+  if (input.greywater !== undefined) {
+    const level = Number(input.greywater.level) || 0
+    if (level > 0) {
+      payload.greywater = { level: Number(level.toFixed(1)) }
+    }
+  }
+
   return payload
 }

client/src/utils/logEntryTankLevels.ts

@@ -41,6 +41,7 @@ export function getClosingTankLevel(tank?: Partial<TankLevels> | null): number {
 export interface LogEntryTankSource {
   freshwater?: Partial<TankLevels>
   fuel?: Partial<TankLevels>
+  greywater?: { level?: number }
   destination?: string
 }
 

client/src/utils/tankCapacity.test.ts

@@ -0,0 +1,62 @@
+import { describe, expect, it } from 'vitest'
+import {
+  clampTankLiters,
+  computeEveningTankMaxLiters,
+  computeRefilledTankMaxLiters,
+  extractTankCapacitiesFromYacht,
+  formatTankLitersForInput,
+  parseOptionalTankLiters,
+  tankCapacityInputFromStored
+} from './tankCapacity.js'
+
+describe('tankCapacity', () => {
+  it('parses optional liters with comma decimal', () => {
+    expect(parseOptionalTankLiters('200')).toBe(200)
+    expect(parseOptionalTankLiters('12,5')).toBe(12.5)
+    expect(parseOptionalTankLiters('')).toBeUndefined()
+  })
+
+  it('rejects negative or invalid liters', () => {
+    expect(() => parseOptionalTankLiters('-1')).toThrow('invalid_tank_liters')
+    expect(() => parseOptionalTankLiters('abc')).toThrow('invalid_tank_liters')
+  })
+
+  it('extracts capacities from yacht payload', () => {
+    expect(
+      extractTankCapacitiesFromYacht({
+        freshwaterCapacityL: 300,
+        fuelCapacityL: 120,
+        greywaterCapacityL: 80
+      })
+    ).toEqual({
+      freshwaterCapacityL: 300,
+      fuelCapacityL: 120,
+      greywaterCapacityL: 80
+    })
+    expect(extractTankCapacitiesFromYacht({ name: 'Test' })).toEqual({})
+  })
+
+  it('formats stored capacity for input', () => {
+    expect(tankCapacityInputFromStored(150)).toBe('150')
+    expect(formatTankLitersForInput(12.5)).toBe('12.5')
+  })
+
+  it('clamps liters to max when set', () => {
+    expect(clampTankLiters(250, 200)).toBe(200)
+    expect(clampTankLiters(-5, 200)).toBe(0)
+    expect(clampTankLiters(50)).toBe(50)
+  })
+
+  it('computes refilled max as capacity minus morning', () => {
+    expect(computeRefilledTankMaxLiters('10', 60)).toBe(50)
+    expect(computeRefilledTankMaxLiters('60', 60)).toBeUndefined()
+    expect(computeRefilledTankMaxLiters('10', undefined)).toBeUndefined()
+  })
+
+  it('computes evening max as morning plus refilled capped by capacity', () => {
+    expect(computeEveningTankMaxLiters('10', '20', 60)).toBe(30)
+    expect(computeEveningTankMaxLiters('40', '40', 60)).toBe(60)
+    expect(computeEveningTankMaxLiters('10', '20')).toBe(30)
+    expect(computeEveningTankMaxLiters('0', '0', 60)).toBeUndefined()
+  })
+})

client/src/utils/tankCapacity.ts

@@ -0,0 +1,101 @@
+import { formatTankLiters } from './logEntryTankLevels.js'
+
+export interface VesselTankCapacities {
+  freshwaterCapacityL?: number
+  fuelCapacityL?: number
+  greywaterCapacityL?: number
+}
+
+export function parseOptionalTankLiters(input: string): number | undefined {
+  const trimmed = input.trim().replace(',', '.')
+  if (!trimmed) return undefined
+  const parsed = Number(trimmed)
+  if (!Number.isFinite(parsed) || parsed < 0) {
+    throw new Error('invalid_tank_liters')
+  }
+  return parsed
+}
+
+export function formatTankLitersForInput(liters: number): string {
+  return formatTankLiters(liters)
+}
+
+function capacityFromStored(value: unknown): number | undefined {
+  if (value == null || value === '') return undefined
+  if (typeof value === 'number' && Number.isFinite(value) && value >= 0) return value
+  if (typeof value === 'string') {
+    const trimmed = value.trim().replace(',', '.')
+    if (!trimmed) return undefined
+    const parsed = Number(trimmed)
+    if (Number.isFinite(parsed) && parsed >= 0) return parsed
+  }
+  return undefined
+}
+
+export function tankCapacityInputFromStored(value: unknown): string {
+  const n = capacityFromStored(value)
+  return n != null ? formatTankLitersForInput(n) : ''
+}
+
+export function extractTankCapacitiesFromYacht(decrypted: unknown): VesselTankCapacities {
+  if (!decrypted || typeof decrypted !== 'object') return {}
+  const y = decrypted as Record<string, unknown>
+  const capacities: VesselTankCapacities = {}
+  const fw = capacityFromStored(y.freshwaterCapacityL)
+  const fuel = capacityFromStored(y.fuelCapacityL)
+  const gw = capacityFromStored(y.greywaterCapacityL)
+  if (fw != null) capacities.freshwaterCapacityL = fw
+  if (fuel != null) capacities.fuelCapacityL = fuel
+  if (gw != null) capacities.greywaterCapacityL = gw
+  return capacities
+}
+
+/** Parse a liter amount from form state (string). */
+export function parseTankLitersFromInput(input: string): number {
+  const trimmed = input.trim().replace(',', '.')
+  if (!trimmed) return 0
+  const parsed = Number(trimmed)
+  return Number.isFinite(parsed) && parsed >= 0 ? parsed : 0
+}
+
+/**
+ * Max for refilled amount: remaining capacity after morning level.
+ * Returns undefined when no positive max (no slider).
+ */
+export function computeRefilledTankMaxLiters(
+  morningInput: string,
+  tankCapacityL?: number
+): number | undefined {
+  if (tankCapacityL == null || tankCapacityL <= 0) return undefined
+  const remaining = tankCapacityL - parseTankLitersFromInput(morningInput)
+  if (remaining <= 0) return undefined
+  return remaining
+}
+
+/**
+ * Max for evening fill level: morning + refilled, capped by tank capacity when known.
+ * Returns undefined when no positive max (no slider).
+ */
+export function computeEveningTankMaxLiters(
+  morningInput: string,
+  refilledInput: string,
+  tankCapacityL?: number
+): number | undefined {
+  const sum = parseTankLitersFromInput(morningInput) + parseTankLitersFromInput(refilledInput)
+  if (sum <= 0) return undefined
+
+  if (tankCapacityL != null && tankCapacityL > 0) {
+    return Math.min(tankCapacityL, sum)
+  }
+
+  return sum
+}
+
+/** Clamp numeric liter value to [0, max] when max is known. */
+export function clampTankLiters(value: number, maxLiters?: number): number {
+  const clamped = Math.max(0, value)
+  if (maxLiters != null && maxLiters > 0) {
+    return Math.min(clamped, maxLiters)
+  }
+  return clamped
+}