feat: add daily/weekly goals, streaks, and time rounding

Settings Timer tab now has daily/weekly goal hour inputs. Dashboard
shows goal progress bars and streak counter. Settings Billing tab
has rounding toggle with increment and method selectors. New
rounding.ts utility for nearest/up/down time rounding.

src/utils/rounding.ts

@@ -0,0 +1,10 @@
+export function roundDuration(seconds: number, incrementMinutes: number, method: 'nearest' | 'up' | 'down'): number {
+  if (incrementMinutes <= 0) return seconds
+  const incSeconds = incrementMinutes * 60
+  switch (method) {
+    case 'up': return Math.ceil(seconds / incSeconds) * incSeconds
+    case 'down': return Math.floor(seconds / incSeconds) * incSeconds
+    case 'nearest': return Math.round(seconds / incSeconds) * incSeconds
+    default: return seconds
+  }
+}

src/views/Settings.vue

@@ -264,6 +264,44 @@
               @change="saveShortcutSettings"
             />
           </div>
+
+          <!-- Divider -->
+          <div class="border-t border-border-subtle" />
+
+          <!-- Goals -->
+          <h3 class="text-[0.6875rem] text-text-tertiary uppercase tracking-[0.08em] font-medium">Goals</h3>
+
+          <div class="flex items-center justify-between">
+            <div>
+              <p class="text-[0.8125rem] text-text-primary">Daily Goal</p>
+              <p class="text-[0.6875rem] text-text-tertiary mt-0.5">Target hours per day</p>
+            </div>
+            <AppNumberInput
+              v-model="dailyGoalHours"
+              :min="0"
+              :max="24"
+              :step="0.5"
+              :precision="1"
+              suffix="hrs"
+              @update:model-value="saveGoalSettings"
+            />
+          </div>
+
+          <div class="flex items-center justify-between">
+            <div>
+              <p class="text-[0.8125rem] text-text-primary">Weekly Goal</p>
+              <p class="text-[0.6875rem] text-text-tertiary mt-0.5">Target hours per week</p>
+            </div>
+            <AppNumberInput
+              v-model="weeklyGoalHours"
+              :min="0"
+              :max="168"
+              :step="1"
+              :precision="0"
+              suffix="hrs"
+              @update:model-value="saveGoalSettings"
+            />
+          </div>
         </div>
       </div>
 
@@ -285,6 +323,63 @@
             @update:model-value="saveSettings"
           />
         </div>
+
+        <!-- Divider -->
+        <div class="border-t border-border-subtle mt-5 pt-5" />
+
+        <div class="flex items-center justify-between">
+          <div>
+            <p class="text-[0.8125rem] text-text-primary">Time Rounding</p>
+            <p class="text-[0.6875rem] text-text-tertiary mt-0.5">Round time entries for billing</p>
+          </div>
+          <button
+            @click="toggleRounding"
+            :class="[
+              'relative inline-flex h-5 w-9 items-center rounded-full transition-colors duration-150',
+              roundingEnabled ? 'bg-status-running' : 'bg-bg-elevated'
+            ]"
+          >
+            <span
+              :class="[
+                'inline-block h-3.5 w-3.5 transform rounded-full bg-text-primary transition-transform duration-150',
+                roundingEnabled ? 'translate-x-[18px]' : 'translate-x-[3px]'
+              ]"
+            />
+          </button>
+        </div>
+
+        <div v-if="roundingEnabled" class="space-y-5 pl-4 border-l-2 border-border-subtle ml-1 mt-5">
+          <div class="flex items-center justify-between">
+            <div>
+              <p class="text-[0.8125rem] text-text-primary">Increment</p>
+              <p class="text-[0.6875rem] text-text-tertiary mt-0.5">Round to nearest increment</p>
+            </div>
+            <div class="w-36">
+              <AppSelect
+                v-model="roundingIncrement"
+                :options="roundingIncrements"
+                label-key="label"
+                value-key="value"
+                @update:model-value="saveRoundingSettings"
+              />
+            </div>
+          </div>
+          <div class="flex items-center justify-between">
+            <div>
+              <p class="text-[0.8125rem] text-text-primary">Method</p>
+              <p class="text-[0.6875rem] text-text-tertiary mt-0.5">Rounding direction</p>
+            </div>
+            <div class="w-36">
+              <AppSelect
+                v-model="roundingMethod"
+                :options="roundingMethods"
+                label-key="label"
+                value-key="value"
+                @update:model-value="saveRoundingSettings"
+              />
+            </div>
+          </div>
+        </div>
       </div>
 
       <!-- Data -->
@@ -448,6 +543,31 @@ const accentColor = ref('amber')
 const shortcutToggleTimer = ref('CmdOrCtrl+Shift+T')
 const shortcutShowApp = ref('CmdOrCtrl+Shift+Z')
 
+// Goal settings
+const dailyGoalHours = ref(8)
+const weeklyGoalHours = ref(40)
+
+// Rounding settings
+const roundingEnabled = ref(false)
+const roundingIncrement = ref(15)
+const roundingMethod = ref('nearest')
+
+const roundingIncrements = [
+  { value: 1, label: '1 minute' },
+  { value: 5, label: '5 minutes' },
+  { value: 6, label: '6 minutes' },
+  { value: 10, label: '10 minutes' },
+  { value: 15, label: '15 minutes' },
+  { value: 30, label: '30 minutes' },
+  { value: 60, label: '1 hour' },
+]
+
+const roundingMethods = [
+  { value: 'nearest', label: 'Nearest' },
+  { value: 'up', label: 'Round up' },
+  { value: 'down', label: 'Round down' },
+]
+
 const themeModes = [
   { value: 'dark', label: 'Dark' },
   { value: 'light', label: 'Light' },
@@ -560,6 +680,25 @@ async function saveShortcutSettings() {
   await settingsStore.updateSetting('shortcut_show_app', shortcutShowApp.value)
 }
 
+// Save goal settings
+async function saveGoalSettings() {
+  await settingsStore.updateSetting('daily_goal_hours', dailyGoalHours.value.toString())
+  await settingsStore.updateSetting('weekly_goal_hours', weeklyGoalHours.value.toString())
+}
+
+// Toggle rounding
+function toggleRounding() {
+  roundingEnabled.value = !roundingEnabled.value
+  saveRoundingSettings()
+}
+
+// Save rounding settings
+async function saveRoundingSettings() {
+  await settingsStore.updateSetting('rounding_enabled', roundingEnabled.value.toString())
+  await settingsStore.updateSetting('rounding_increment', roundingIncrement.value.toString())
+  await settingsStore.updateSetting('rounding_method', roundingMethod.value)
+}
+
 // Import file handling
 async function handleImportFile() {
   try {
@@ -670,5 +809,10 @@ onMounted(async () => {
   accentColor.value = settingsStore.settings.accent_color || 'amber'
   shortcutToggleTimer.value = settingsStore.settings.shortcut_toggle_timer || 'CmdOrCtrl+Shift+T'
   shortcutShowApp.value = settingsStore.settings.shortcut_show_app || 'CmdOrCtrl+Shift+Z'
+  dailyGoalHours.value = parseFloat(settingsStore.settings.daily_goal_hours) || 8
+  weeklyGoalHours.value = parseFloat(settingsStore.settings.weekly_goal_hours) || 40
+  roundingEnabled.value = settingsStore.settings.rounding_enabled === 'true'
+  roundingIncrement.value = parseInt(settingsStore.settings.rounding_increment) || 15
+  roundingMethod.value = settingsStore.settings.rounding_method || 'nearest'
 })
 </script>