feat: Zeit nachtragen fuer Git-Push-Worksheets

Git-Pushes erzeugen Worksheets mit automatischer Endzeit (Push-Zeitpunkt),
aber ohne Startzeit. Neu:
- WorksheetList: Pille 'Zeit offen' + Button 'Zeit nachtragen' bei
  GIT-Worksheets ohne Startzeit/Arbeitszeit
- EditWorksheetTimeModal: Startdatum/-zeit erfassen, Arbeitszeit wird live
  berechnet (inkl. Uebernacht-Logik), speichert via updateWorksheet und setzt
  isComment=false, damit der Eintrag in der Arbeitszeit-Statistik zaehlt

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/components/WorksheetList.jsx

@@ -1,7 +1,11 @@
 import { useState } from 'react'
 import { FaClock, FaUser, FaExchangeAlt, FaComment, FaChevronDown, FaChevronUp } from 'react-icons/fa'
 
-export default function WorksheetList({ worksheets, totalTime, loading }) {
+function needsTimeEntry(ws) {
+  return ws.serviceType === 'GIT' && (!ws.startTime || !Number(ws.totalTime))
+}
+
+export default function WorksheetList({ worksheets, totalTime, loading, onEditTime }) {
   const [expandedWorksheets, setExpandedWorksheets] = useState({})
   if (loading) {
     return (
@@ -105,13 +109,20 @@ export default function WorksheetList({ worksheets, totalTime, loading }) {
                     )}
                     <div>
                       <strong className="fs-6">WSID {ws.wsid}</strong>
-                      {ws.isComment && (
-                        <span className="badge ms-2" style={{ 
+                      {ws.isComment && !isGit && (
+                        <span className="badge ms-2" style={{
                           background: 'rgba(255,255,255,0.3)'
                         }}>
                           <FaComment className="me-1" /> Kommentar
                         </span>
                       )}
+                      {needsTimeEntry(ws) && (
+                        <span className="badge ms-2" style={{
+                          background: 'rgba(255,255,255,0.3)'
+                        }}>
+                          <FaClock className="me-1" /> Zeit offen
+                        </span>
+                      )}
                     </div>
                     {/* Collapsed: Mitarbeiter & Zeit im Header */}
                     {!isExpanded && (
@@ -133,9 +144,31 @@ export default function WorksheetList({ worksheets, totalTime, loading }) {
                       </div>
                     )}
                   </div>
-                  <small style={{ opacity: 0.9 }}>
-                    {formatDateTime(ws.startDate, ws.startTime)}
-                  </small>
+                  <div className="d-flex align-items-center gap-2">
+                    {needsTimeEntry(ws) && onEditTime && (
+                      <button
+                        type="button"
+                        className="btn btn-sm"
+                        style={{
+                          background: 'rgba(255,255,255,0.25)',
+                          color: 'white',
+                          border: '1px solid rgba(255,255,255,0.4)',
+                          borderRadius: '6px',
+                          padding: '2px 10px',
+                          fontSize: '0.8rem',
+                        }}
+                        onClick={(e) => {
+                          e.stopPropagation()
+                          onEditTime(ws)
+                        }}
+                      >
+                        <FaClock className="me-1" /> Zeit nachtragen
+                      </button>
+                    )}
+                    <small style={{ opacity: 0.9 }}>
+                      {formatDateTime(ws.startDate, ws.startTime) || formatDateTime(ws.endDate, ws.endTime)}
+                    </small>
+                  </div>
                 </div>
                 
                 {/* Body - Nur wenn expanded */}