fix(admin): stack settings rows vertically on phone widths

Inquiry Settings + Business Rules cards used a flex-row layout that
crushed the label column into a narrow vertical stripe at 390px ("Inquiry
/ Contact / Email" wrapping one word per line) while the input took the
right side.

Stack label + helper text above the input on phone widths; restore the
side-by-side row from sm up. Same pattern as the other detail-edit rows
that were fixed in pass-2/pass-3.

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

src/components/admin/settings/settings-manager.tsx

@@ -241,7 +241,14 @@ export function SettingsManager() {
             </CardHeader>
             <CardContent className="space-y-4">
               {KNOWN_SETTINGS.filter((s) => s.type === 'string').map((setting) => (
-                <div key={setting.key} className="flex items-center justify-between gap-4">
+                <div
+                  key={setting.key}
+                  // Stack label/description above the input on phone widths.
+                  // The previous flex row crushed the label column into a
+                  // narrow vertical stripe ("Inquiry / Contact / Email" wrapping
+                  // one word per line) while the input took the rest.
+                  className="flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between sm:gap-4"
+                >
                   <div className="flex-1">
                     <Label>{setting.label}</Label>
                     <p className="text-xs text-muted-foreground">{setting.description}</p>
@@ -249,7 +256,7 @@ export function SettingsManager() {
                   <div className="flex items-center gap-2">
                     <Input
                       type="text"
-                      className="w-64"
+                      className="w-full sm:w-64"
                       value={String(getEffectiveValue(setting.key, setting.defaultValue) ?? '')}
                       onChange={(e) =>
                         setValues((prev) => ({
@@ -283,7 +290,10 @@ export function SettingsManager() {
           </CardHeader>
           <CardContent className="space-y-4">
             {KNOWN_SETTINGS.filter((s) => s.type === 'number').map((setting) => (
-              <div key={setting.key} className="flex items-center justify-between gap-4">
+              <div
+                key={setting.key}
+                className="flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between sm:gap-4"
+              >
                 <div className="flex-1">
                   <Label>{setting.label}</Label>
                   <p className="text-xs text-muted-foreground">{setting.description}</p>
@@ -291,7 +301,7 @@ export function SettingsManager() {
                 <div className="flex items-center gap-2">
                   <Input
                     type="number"
-                    className="w-24"
+                    className="w-full sm:w-24"
                     value={String(getEffectiveValue(setting.key, setting.defaultValue) ?? '')}
                     onChange={(e) =>
                       setValues((prev) => ({