fix(ux): inline yacht-prereq picker + deprioritize country in client form

F23: when the rep tries to leave the Enquiry stage on an interest with no yacht linked, the stage popover now switches into an inline yacht-picker view (filtered to the client's own yachts when known). On submit it PATCHes interest.yachtId then chains the stage move, so the prereq fix and the advance happen in one flow instead of the rep bouncing to the validation error toast.
F24: Country moved out of the Basic Information section (next to Full Name *) into Source & Preferences alongside Timezone — country is timezone-hint material, not first-line identity data. Quick-path for a new client is now just name + contact.

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

src/components/clients/client-form.tsx

@@ -251,23 +251,12 @@ export function ClientForm({
               Basic Information
             </h3>
 
-            <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
-              <div className="sm:col-span-2 space-y-1">
-                <Label>Full Name *</Label>
-                <Input {...register('fullName')} placeholder="John Smith" />
-                {errors.fullName && (
-                  <p className="text-xs text-destructive">{errors.fullName.message}</p>
-                )}
-              </div>
-
-              <div className="space-y-1">
-                <Label>Country</Label>
-                <CountryCombobox
-                  value={watch('nationalityIso')}
-                  onChange={(iso) => setValue('nationalityIso', iso ?? undefined)}
-                  data-testid="client-nationality"
-                />
-              </div>
+            <div className="space-y-1">
+              <Label>Full Name *</Label>
+              <Input {...register('fullName')} placeholder="John Smith" />
+              {errors.fullName && (
+                <p className="text-xs text-destructive">{errors.fullName.message}</p>
+              )}
             </div>
           </div>
 
@@ -450,6 +439,14 @@ export function ClientForm({
                   </SelectContent>
                 </Select>
               </div>
+              <div className="space-y-1">
+                <Label>Country</Label>
+                <CountryCombobox
+                  value={watch('nationalityIso')}
+                  onChange={(iso) => setValue('nationalityIso', iso ?? undefined)}
+                  data-testid="client-nationality"
+                />
+              </div>
               <div className="space-y-1">
                 <Label>Timezone</Label>
                 <TimezoneCombobox