auto-detect date format (DD/MM vs MM/DD) in CSV imports

Scans all date values in imported CSVs to determine whether the file
uses DD/MM/YYYY or MM/DD/YYYY format. When the format is ambiguous
(all day and month values are <= 12), shows an inline dropdown for the
user to choose. Bump version to 1.0.2.

src/views/Settings.vue

@@ -1445,6 +1445,32 @@
                 </table>
               </div>
 
+              <!-- Date format detection -->
+              <div v-if="importFormat !== 'json' && importFormat !== 'generic'" class="flex items-center gap-3 mb-3">
+                <template v-if="importDateDetected !== 'ambiguous'">
+                  <span class="text-[0.6875rem] text-text-tertiary">
+                    Date format detected: {{ importDateFormat === 'DMY' ? 'DD/MM/YYYY' : 'MM/DD/YYYY' }}
+                  </span>
+                  <button
+                    @click="importDateDetected = 'ambiguous'"
+                    class="text-[0.6875rem] text-accent hover:text-accent-hover transition-colors"
+                  >
+                    Change
+                  </button>
+                </template>
+                <template v-else>
+                  <label class="text-[0.6875rem] text-text-tertiary">Date format:</label>
+                  <div class="w-36">
+                    <AppSelect
+                      v-model="importDateFormat"
+                      :options="dateFormatOptions"
+                      label-key="label"
+                      value-key="value"
+                    />
+                  </div>
+                </template>
+              </div>
+
               <button
                 @click="executeImport"
                 :disabled="isImporting"
@@ -1541,7 +1567,7 @@ import AppSelect from '../components/AppSelect.vue'
 import AppShortcutRecorder from '../components/AppShortcutRecorder.vue'
 import AppTimePicker from '../components/AppTimePicker.vue'
 import { LOCALES, getCurrencies, getCurrencySymbol } from '../utils/locale'
-import { parseCSV, mapTogglCSV, mapClockifyCSV, mapHarvestCSV, mapGenericCSV, type ImportEntry } from '../utils/import'
+import { parseCSV, mapTogglCSV, mapClockifyCSV, mapHarvestCSV, mapGenericCSV, detectDateFormat, findCol, type ImportEntry, type DateFormat, type DateDetectResult } from '../utils/import'
 import { TIMER_FONTS, loadGoogleFont, loadAndApplyTimerFont } from '../utils/fonts'
 import { UI_FONTS, loadUIFont } from '../utils/uiFonts'
 import { useFocusTrap } from '../utils/focusTrap'
@@ -1978,6 +2004,13 @@ const importFileName = ref('')
 const importPreview = ref<string[][]>([])
 const importStatus = ref('')
 const isImporting = ref(false)
+const importDateDetected = ref<DateDetectResult>('ambiguous')
+const importDateFormat = ref<DateFormat>('MDY')
+
+const dateFormatOptions = [
+  { label: 'MM/DD/YYYY', value: 'MDY' },
+  { label: 'DD/MM/YYYY', value: 'DMY' },
+]
 
 const importFormats = [
   { label: 'Toggl CSV', value: 'toggl' },
@@ -2358,8 +2391,23 @@ async function handleImportFile() {
 
     if (importFormat.value === 'json') {
       importPreview.value = []
+      importDateDetected.value = 'ambiguous'
+      importDateFormat.value = 'MDY'
     } else {
-      importPreview.value = parseCSV(content).slice(0, 6)
+      const allRows = parseCSV(content)
+      importPreview.value = allRows.slice(0, 6)
+
+      // Detect date format from CSV data
+      const header = allRows[0]?.map(h => h.toLowerCase().trim()) || []
+      let dateColIdx = -1
+      if (importFormat.value === 'harvest') {
+        dateColIdx = findCol(header, 'date')
+      } else {
+        dateColIdx = findCol(header, 'start date')
+      }
+      const detected = detectDateFormat(allRows, dateColIdx)
+      importDateDetected.value = detected
+      importDateFormat.value = detected === 'ambiguous' ? 'MDY' : detected
     }
   } catch (e) {
     console.error('Failed to read file:', e)
@@ -2380,12 +2428,13 @@ async function executeImport() {
       const rows = parseCSV(importFileContent.value)
       let entries: ImportEntry[]
 
+      const df = importDateFormat.value
       if (importFormat.value === 'toggl') {
-        entries = mapTogglCSV(rows)
+        entries = mapTogglCSV(rows, df)
       } else if (importFormat.value === 'clockify') {
-        entries = mapClockifyCSV(rows)
+        entries = mapClockifyCSV(rows, df)
       } else if (importFormat.value === 'harvest') {
-        entries = mapHarvestCSV(rows)
+        entries = mapHarvestCSV(rows, df)
       } else {
         entries = mapGenericCSV(rows, { project: 0, description: 1, start_time: 2, duration: 3, client: -1, task: -1 })
       }
@@ -2397,6 +2446,8 @@ async function executeImport() {
     importFileContent.value = ''
     importFileName.value = ''
     importPreview.value = []
+    importDateDetected.value = 'ambiguous'
+    importDateFormat.value = 'MDY'
   } catch (e) {
     importStatus.value = `Error: ${e}`
   } finally {