fix(natural-date-input): preserve input on edit, use reliable update event

Two reliability bugs in the natural-language date input:

1. Clicking Edit on a saved-date pill and changing the value immediately
   re-showed the saved value. clearAndEdit pre-fills the input with the
   formatted saved date so the admin doesn't start over, but chrono
   parses that string on the very first keystroke, re-sets parsedDate,
   and the auto-hide template flips the pill back. Added an isEditing
   flag that keeps the input visible across re-parses and clears on
   blur once we have a valid parse.

2. Typing "tomorrow at 2pm" sometimes committed "tomorrow at <current
   time>". UInput's template spreads \$attrs onto the inner <input>
   alongside its own @input="onInput", and Vue's listener-array merge
   intermittently drops the fall-through @input mid-typing — in the
   reproduction, the final 'm' never reached parseNaturalInput, so
   chrono's last successful read was "tomorrow at 2p" matching just
   "tomorrow". Switched to @update:model-value (a declared emit on
   UInput, so it goes through the reliable component-emit path) and
   made onBlur always re-parse the final value as a backup.

app/components/NaturalDateInput.vue

@@ -1,8 +1,8 @@
 <template>
   <div class="space-y-2">
-    <div v-if="!parsedDate || hasError" class="relative">
+    <div v-if="!parsedDate || hasError || isEditing" class="relative">
       <UInput
-        v-model="naturalInput"
+        :model-value="naturalInput"
         :placeholder="placeholder"
         :color="
           hasError && naturalInput.trim()
@@ -11,7 +11,7 @@
               ? 'success'
               : undefined
         "
-        @input="parseNaturalInput"
+        @update:model-value="onNaturalInputChange"
         @blur="onBlur"
       >
         <template #trailing>
@@ -32,7 +32,7 @@
     </div>
 
     <div
-      v-if="parsedDate && isValidParse"
+      v-if="parsedDate && isValidParse && !isEditing"
       class="text-sm px-3 py-2"
       style="color: var(--candle); background: color-mix(in srgb, var(--candle) 15%, transparent); border: 1px solid var(--candle)"
     >
@@ -108,6 +108,7 @@ const isValidParse = ref(false);
 const hasError = ref(false);
 const errorMessage = ref("");
 const datetimeValue = ref("");
+const isEditing = ref(false);
 
 // Initialize with current value
 onMounted(() => {
@@ -132,6 +133,7 @@ watch(
         datetimeValue.value = formatForDatetimeLocal(date);
         isValidParse.value = true;
         naturalInput.value = ""; // Clear natural input when set externally
+        isEditing.value = false;
       }
     } else if (!newValue) {
       reset();
@@ -175,11 +177,23 @@ const parseNaturalInput = () => {
   }
 };
 
+// UInput's fall-through @input listener fires unreliably (the Nuxt UI Input
+// template merges $attrs with an explicit @input and can drop keystrokes).
+// update:model-value is a declared emit and fires for every change.
+const onNaturalInputChange = (value) => {
+  naturalInput.value = value;
+  parseNaturalInput();
+};
+
 const onBlur = () => {
-  // If we have a valid parse but the input changed, try to parse again
-  if (naturalInput.value.trim() && !isValidParse.value) {
+  // Always re-parse on blur so the final typed value wins, even if an
+  // intermediate state produced a stale parse.
+  if (naturalInput.value.trim()) {
     parseNaturalInput();
   }
+  if (isValidParse.value) {
+    isEditing.value = false;
+  }
 };
 
 const onDatetimeChange = () => {
@@ -190,6 +204,7 @@ const onDatetimeChange = () => {
       isValidParse.value = true;
       hasError.value = false;
       naturalInput.value = ""; // Clear natural input when using traditional picker
+      isEditing.value = false;
       emit("update:modelValue", datetimeValue.value);
     }
   } else {
@@ -227,6 +242,9 @@ const clearAndEdit = () => {
   parsedDate.value = null;
   isValidParse.value = false;
   hasError.value = false;
+  // Prevent auto-hide while editing: chrono re-parses the pre-filled string
+  // on the first keystroke, which would otherwise hide the input.
+  isEditing.value = true;
 };
 
 const formatForDatetimeLocal = (date) => {