feat(activities): themed date/time pickers + end-after-start guard

Swap the native <input type="date|time"> controls in CreateEventDialog
for the shared DatePicker / TimePicker components so the form looks
like the rest of the shadcn UI instead of browser chrome.

While there:

- End date auto-mirrors start date on pick (and re-mirrors if the
  existing end has fallen behind the new start), so a one-day event
  needs no extra clicks.
- Zod superRefine rejects end < start, comparing the folded date+time
  string so equal-date / later-time is enforced too.
- Move End date/time out of the "More options" collapsible into the
  main form flow (drops Collapsible / Separator / ChevronDown / the
  showMoreOptions ref).
- End time label reads "End time (optional)" to make the field's
  status obvious.
- Banner image label is plain markup (not <FormItem>) since it's
  managed via bannerImages ref outside vee-validate.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/modules/activities/components/CreateEventDialog.vue

@@ -24,7 +24,6 @@ import { Input } from '@/components/ui/input'
 import { Textarea } from '@/components/ui/textarea'
 import { Button } from '@/components/ui/button'
 import { Badge } from '@/components/ui/badge'
-import { Separator } from '@/components/ui/separator'
 import { ScrollArea } from '@/components/ui/scroll-area'
 import {
   Select,
@@ -33,15 +32,12 @@ import {
   SelectTrigger,
   SelectValue,
 } from '@/components/ui/select'
-import {
-  Collapsible,
-  CollapsibleContent,
-  CollapsibleTrigger,
-} from '@/components/ui/collapsible'
-import { Calendar, Loader2, ChevronDown, MapPin } from 'lucide-vue-next'
+import { Calendar, Loader2, MapPin } from 'lucide-vue-next'
 import { toastService } from '@/core/services/ToastService'
 import { injectService, SERVICE_TOKENS } from '@/core/di-container'
 import ImageUpload from '@/modules/base/components/ImageUpload.vue'
+import DatePicker from '@/modules/base/components/DatePicker.vue'
+import TimePicker from '@/modules/base/components/TimePicker.vue'
 import type { ImageUploadService, UploadedImage } from '@/modules/base/services/ImageUploadService'
 import type { TicketApiService } from '../services/TicketApiService'
 import type { CreateEventRequest } from '../types/ticket'
@@ -60,18 +56,45 @@ const emit = defineEmits<{
 
 const { t } = useI18n()
 
-const formSchema = toTypedSchema(z.object({
-  name: z.string().min(1, "Title is required").max(200, "Title too long"),
-  info: z.string().max(2000, "Description too long").optional().default(''),
-  event_start_date: z.string().min(1, "Start date is required"),
-  event_start_time: z.string().optional().default(''),
-  event_end_date: z.string().optional().default(''),
-  event_end_time: z.string().optional().default(''),
-  location: z.string().max(500).optional().default(''),
-  currency: z.string().default("sat"),
-  amount_tickets: z.number().min(0).max(100000).default(0),
-  price_per_ticket: z.number().min(0).default(0),
-}))
+// Fold a date input ("YYYY-MM-DD") and an optional time input ("HH:MM")
+// into the events-extension wire format: date-only when no time given,
+// ISO 8601 datetime otherwise. The publisher switches NIP-52 kinds on
+// the "T" delimiter. Hoisted above the schema so the validation refine
+// can reuse it.
+function foldDateTime(date: string, time: string): string {
+  if (!date) return ''
+  return time ? `${date}T${time}` : date
+}
+
+const formSchema = toTypedSchema(
+  z
+    .object({
+      name: z.string().min(1, "Title is required").max(200, "Title too long"),
+      info: z.string().max(2000, "Description too long").optional().default(''),
+      event_start_date: z.string().min(1, "Start date is required"),
+      event_start_time: z.string().optional().default(''),
+      event_end_date: z.string().optional().default(''),
+      event_end_time: z.string().optional().default(''),
+      location: z.string().max(500).optional().default(''),
+      currency: z.string().default("sat"),
+      amount_tickets: z.number().min(0).max(100000).default(0),
+      price_per_ticket: z.number().min(0).default(0),
+    })
+    .superRefine((v, ctx) => {
+      // End must not precede start. Compare on the folded date+time
+      // string so equal-date / later-time is enforced too.
+      if (!v.event_end_date) return
+      const start = foldDateTime(v.event_start_date, v.event_start_time)
+      const end = foldDateTime(v.event_end_date, v.event_end_time)
+      if (start && end && end < start) {
+        ctx.addIssue({
+          code: z.ZodIssueCode.custom,
+          path: ['event_end_date'],
+          message: 'End must be on or after start',
+        })
+      }
+    })
+)
 
 const form = useForm({
   validationSchema: formSchema,
@@ -94,14 +117,21 @@ interface BannerImage extends UploadedImage {
 }
 const bannerImages = ref<BannerImage[]>([])
 
-// Fold a date input ("YYYY-MM-DD") and an optional time input ("HH:MM")
-// into the events-extension wire format: date-only when no time given,
-// ISO 8601 datetime otherwise. The publisher switches NIP-52 kinds on
-// the "T" delimiter.
-function foldDateTime(date: string, time: string): string {
-  if (!date) return ''
-  return time ? `${date}T${time}` : date
-}
+// Auto-mirror end date to start: when the user picks a start date,
+// surface that same date in the end-date picker so a one-day event
+// requires no extra clicks. Don't overwrite an end date the user
+// already set *after* the start — only fill when empty or when the
+// existing end has fallen behind the new start.
+watch(
+  () => form.values.event_start_date,
+  (start, prev) => {
+    if (!start) return
+    const end = form.values.event_end_date
+    if (!end || end < start || end === prev) {
+      form.setFieldValue('event_end_date', start)
+    }
+  }
+)
 
 const paymentService = injectService(SERVICE_TOKENS.PAYMENT_SERVICE)
 const ticketApi = injectService(SERVICE_TOKENS.TICKET_API) as TicketApiService | null
@@ -110,7 +140,6 @@ const imageService = injectService<ImageUploadService>(SERVICE_TOKENS.IMAGE_UPLO
 const availableCurrencies = ref<string[]>(['sat'])
 const loadingCurrencies = ref(false)
 const selectedCategories = ref<string[]>([])
-const showMoreOptions = ref(false)
 
 watch(() => props.open, async (isOpen) => {
   if (isOpen && ticketApi && !loadingCurrencies.value) {
@@ -125,7 +154,6 @@ watch(() => props.open, async (isOpen) => {
   }
   if (!isOpen) {
     selectedCategories.value = []
-    showMoreOptions.value = false
   }
 })
 
@@ -240,21 +268,67 @@ const handleOpenChange = (open: boolean) => {
 
           <!-- Start date (required) + optional time -->
           <div class="grid grid-cols-1 sm:grid-cols-3 gap-3">
-            <FormField v-slot="{ componentField }" name="event_start_date">
+            <FormField v-slot="{ value, handleChange }" name="event_start_date">
               <FormItem class="sm:col-span-2 min-w-0">
                 <FormLabel>Start date *</FormLabel>
                 <FormControl>
-                  <Input type="date" :min="today" class="w-full" v-bind="componentField" />
+                  <DatePicker
+                    :model-value="value as string ?? ''"
+                    :min="today"
+                    placeholder="Pick a date"
+                    @update:model-value="handleChange"
+                  />
                 </FormControl>
                 <FormMessage />
               </FormItem>
             </FormField>
 
-            <FormField v-slot="{ componentField }" name="event_start_time">
+            <FormField v-slot="{ value, handleChange }" name="event_start_time">
               <FormItem class="min-w-0">
                 <FormLabel>Start time</FormLabel>
                 <FormControl>
-                  <Input type="time" class="w-full" v-bind="componentField" />
+                  <TimePicker
+                    :model-value="value as string ?? ''"
+                    clearable
+                    @update:model-value="handleChange"
+                  />
+                </FormControl>
+                <FormMessage />
+              </FormItem>
+            </FormField>
+          </div>
+
+          <!-- End date + optional time. Auto-mirrors start date until
+               the user moves it forward; cross-field rule enforces
+               end >= start in the Zod schema. -->
+          <div class="grid grid-cols-1 sm:grid-cols-3 gap-3">
+            <FormField v-slot="{ value, handleChange }" name="event_end_date">
+              <FormItem class="sm:col-span-2 min-w-0">
+                <FormLabel>End date</FormLabel>
+                <FormControl>
+                  <DatePicker
+                    :model-value="value as string ?? ''"
+                    :min="(form.values.event_start_date as string) || today"
+                    placeholder="Pick a date"
+                    @update:model-value="handleChange"
+                  />
+                </FormControl>
+                <FormMessage />
+              </FormItem>
+            </FormField>
+
+            <FormField v-slot="{ value, handleChange }" name="event_end_time">
+              <FormItem class="min-w-0">
+                <FormLabel>
+                  End time
+                  <span class="text-muted-foreground font-normal">(optional)</span>
+                </FormLabel>
+                <FormControl>
+                  <TimePicker
+                    :model-value="value as string ?? ''"
+                    clearable
+                    @update:model-value="handleChange"
+                  />
                 </FormControl>
                 <FormMessage />
               </FormItem>
@@ -371,42 +445,6 @@ const handleOpenChange = (open: boolean) => {
             </FormField>
           </div>
 
-          <!-- More options (collapsible) -->
-          <Collapsible v-model:open="showMoreOptions">
-            <CollapsibleTrigger as-child>
-              <Button type="button" variant="ghost" size="sm" class="w-full justify-between text-muted-foreground">
-                More options
-                <ChevronDown class="w-4 h-4 transition-transform" :class="{ 'rotate-180': showMoreOptions }" />
-              </Button>
-            </CollapsibleTrigger>
-            <CollapsibleContent class="space-y-4 pt-2">
-              <Separator />
-
-              <div class="grid grid-cols-1 sm:grid-cols-3 gap-3">
-                <FormField v-slot="{ componentField }" name="event_end_date">
-                  <FormItem class="sm:col-span-2 min-w-0">
-                    <FormLabel>End date</FormLabel>
-                    <FormControl>
-                      <Input type="date" :min="today" class="w-full" v-bind="componentField" />
-                    </FormControl>
-                    <FormDescription class="text-xs">Defaults to start date</FormDescription>
-                    <FormMessage />
-                  </FormItem>
-                </FormField>
-
-                <FormField v-slot="{ componentField }" name="event_end_time">
-                  <FormItem class="min-w-0">
-                    <FormLabel>End time</FormLabel>
-                    <FormControl>
-                      <Input type="time" class="w-full" v-bind="componentField" />
-                    </FormControl>
-                    <FormMessage />
-                  </FormItem>
-                </FormField>
-              </div>
-            </CollapsibleContent>
-          </Collapsible>
-
           <!-- Actions -->
           <div class="flex justify-end gap-3 pt-2">
             <Button type="button" variant="outline" @click="handleOpenChange(false)" :disabled="isLoading">