feat: add target hours selector and update timer calculations based on user input

public/index.html

@@ -382,6 +382,23 @@
               Startzeit manuell eingeben
             </button>
             
+            <!-- Target hours selector -->
+            <div class="mt-3 flex items-center gap-2">
+              <label for="targetHoursSelect" class="text-sm text-gray-400">Soll-Stunden:</label>
+              <select id="targetHoursSelect" class="px-3 py-1 bg-gray-700 text-gray-100 border border-gray-600 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 text-sm">
+                <option value="1">1h</option>
+                <option value="2">2h</option>
+                <option value="3">3h</option>
+                <option value="4">4h</option>
+                <option value="5">5h</option>
+                <option value="6">6h</option>
+                <option value="7">7h</option>
+                <option value="8" selected>8h</option>
+                <option value="9">9h</option>
+                <option value="10">10h</option>
+              </select>
+            </div>
+            
             <input type="text" id="manualStartTimeInput" class="hidden">
             
             <!-- Additional Timer Metrics -->
@@ -392,7 +409,7 @@
               </button>
               <div class="flex items-center gap-2 text-gray-300">
                 <i data-lucide="target" class="w-4 h-4 text-green-400"></i>
-                <span>Soll erreicht: <span id="targetReachedTime" class="font-semibold text-white">--:--</span> (8h)</span>
+                <span>Soll erreicht: <span id="targetReachedTime" class="font-semibold text-white">--:--</span></span>
               </div>
               <div class="flex items-center gap-2 text-gray-300">
                 <i data-lucide="timer" class="w-4 h-4 text-blue-400"></i>

public/js/main.js

@@ -339,7 +339,7 @@ function updateTimer() {
   const balanceCell = document.getElementById('current-day-balance');
   if (balanceCell) {
     const netHours = elapsed / 3600; // Convert seconds to hours
-    const deviation = netHours - 8.0;
+    const deviation = netHours - targetHours;
     const baseBalance = parseFloat(balanceCell.dataset.baseBalance || 0);
     const currentBalance = baseBalance + deviation;
     
@@ -388,8 +388,8 @@ function updateTimerMetrics(netElapsedSeconds) {
     return;
   }
   
-  // Target: 8 hours (28800 seconds)
-  const targetSeconds = 8 * 60 * 60;
+  // Target hours from user selection (default 8)
+  const targetSeconds = targetHours * 60 * 60;
   
   // Calculate total pause time: 30 min after 6h + 15 min after 9h
   const pauseDuration30Min = 30 * 60; // 30 minutes in seconds
@@ -398,14 +398,14 @@ function updateTimerMetrics(netElapsedSeconds) {
   // Time needed including pauses
   // After 6h work -> 30 min pause
   // After 9h work -> 15 min pause
-  // Total gross time = 8h work + 30min pause + 15min pause = 8h 45min
+  // Total gross time = target work hours + 30min pause + 15min pause
   const totalGrossTimeNeeded = targetSeconds + pauseDuration30Min + pauseDuration15Min;
   
   // Calculate when target will be reached (clock time)
   const targetReachedTimestamp = new Date(timerStartTime + totalGrossTimeNeeded * 1000);
-  const targetHours = String(targetReachedTimestamp.getHours()).padStart(2, '0');
-  const targetMinutes = String(targetReachedTimestamp.getMinutes()).padStart(2, '0');
-  targetReachedTimeSpan.textContent = `${targetHours}:${targetMinutes}`;
+  const targetHoursTime = String(targetReachedTimestamp.getHours()).padStart(2, '0');
+  const targetMinutesDisplay = String(targetReachedTimestamp.getMinutes()).padStart(2, '0');
+  targetReachedTimeSpan.textContent = `${targetHoursTime}:${targetMinutesDisplay}`;
   
   // Calculate countdown to target (remaining net work time)
   const remainingNetSeconds = Math.max(0, targetSeconds - netElapsedSeconds);
@@ -823,16 +823,21 @@ function renderMonthlyView(entries) {
       let balanceCell = '';
       
       if (isPastDay && entryType !== 'vacation') {
-        // For all workdays (including flextime): Actual - Target (8h)
+        // For all workdays (including flextime): Actual - Target (8h default)
         // Flextime has netHours = 0, so deviation will be -8h
+        
+        // For current day: store balance before today, then use custom target hours in live update
+        const balanceBeforeToday = runningBalance;
         const deviation = entry.netHours - 8.0;
         runningBalance += deviation;
+        
         const balanceColor = runningBalance >= 0 ? 'text-green-400' : 'text-red-400';
         const balanceSign = runningBalance >= 0 ? '+' : '';
         
         // Add ID for current day to enable live updates
+        // Store balance before today, so live update can add current day's deviation with custom target
         const balanceId = isToday && entryType === 'work' ? 'id="current-day-balance"' : '';
-        const balanceDataAttr = isToday && entryType === 'work' ? `data-base-balance="${runningBalance - deviation}"` : '';
+        const balanceDataAttr = isToday && entryType === 'work' ? `data-base-balance="${balanceBeforeToday}"` : '';
         
         balanceCell = `<td class="px-4 py-3 whitespace-nowrap text-sm font-semibold ${balanceColor}" ${balanceId} ${balanceDataAttr}>${balanceSign}${runningBalance.toFixed(2)}h</td>`;
       } else {
@@ -3840,6 +3845,16 @@ function initializeEventListeners() {
   document.getElementById('btnStartWork').addEventListener('click', startWork);
   document.getElementById('btnStopWork').addEventListener('click', stopWork);
   
+  // Target hours selector
+  document.getElementById('targetHoursSelect').addEventListener('change', (e) => {
+    targetHours = parseInt(e.target.value);
+    // Update metrics if timer is running
+    if (timerStartTime) {
+      const elapsed = Math.floor((Date.now() - timerStartTime) / 1000) - timerPausedDuration;
+      updateTimerMetrics(elapsed);
+    }
+  });
+  
   // Timer status - manual start time entry
   document.getElementById('timerStatus').addEventListener('click', () => {
     if (!timerStartTime) {

public/js/state.js

@@ -17,6 +17,7 @@ let timerPausedDuration = 0; // Total paused time in seconds
 let isPaused = false;
 let pauseTimeout = null;
 let currentEntryId = null; // ID of today's entry being timed
+let targetHours = 8; // Target work hours per day (1-10)
 
 // Current month display state
 let displayYear = new Date().getFullYear();