Fix share name toggle revert and stale table data for umbral contacts

Bug 1: _to_settings_response() was missing share_first_name and
share_last_name — the response always returned false (Pydantic default),
causing the frontend to sync toggles back to off after save.

Bug 2: Table column renderers read from stale Person record fields.
Added sf() helper that overlays shared_fields for umbral contacts,
applied to name, phone, email, role, and birthday columns. The table
now shows live shared profile data matching the detail panel.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/routers/settings.py

@@ -48,6 +48,8 @@ def _to_settings_response(s: Settings) -> SettingsResponse:
         # Social settings
         accept_connections=s.accept_connections,
         # Sharing defaults
+        share_first_name=s.share_first_name,
+        share_last_name=s.share_last_name,
         share_preferred_name=s.share_preferred_name,
         share_email=s.share_email,
         share_phone=s.share_phone,

frontend/src/components/people/PeoplePage.tsx

@@ -85,6 +85,14 @@ function sortPeople(people: Person[], key: string, dir: 'asc' | 'desc'): Person[
 // ---------------------------------------------------------------------------
 // Column definitions
 // ---------------------------------------------------------------------------
+/** Get a field value, preferring shared_fields for umbral contacts. */
+function sf(p: Person, key: string): string | null | undefined {
+  if (p.is_umbral_contact && p.shared_fields && key in p.shared_fields) {
+    return p.shared_fields[key] as string | null;
+  }
+  return p[key as keyof Person] as string | null | undefined;
+}
+
 const columns: ColumnDef<Person>[] = [
   {
     key: 'name',
@@ -92,7 +100,10 @@ const columns: ColumnDef<Person>[] = [
     sortable: true,
     visibilityLevel: 'essential',
     render: (p) => {
-      const initialsName = getPersonInitialsName(p);
+      const firstName = sf(p, 'first_name') ?? p.first_name;
+      const lastName = sf(p, 'last_name') ?? p.last_name;
+      const liveName = [firstName, lastName].filter(Boolean).join(' ') || p.nickname || p.name;
+      const initialsName = liveName || getPersonInitialsName(p);
       return (
         <div className="flex items-center gap-2.5">
           <div
@@ -100,7 +111,7 @@ const columns: ColumnDef<Person>[] = [
           >
             {getInitials(initialsName)}
           </div>
-          <span className="font-medium truncate">{p.nickname || p.name}</span>
+          <span className="font-medium truncate">{liveName}</span>
           {p.is_umbral_contact && (
             <Ghost className="h-3.5 w-3.5 text-violet-400 shrink-0" aria-label="Umbral contact" />
           )}
@@ -113,18 +124,21 @@ const columns: ColumnDef<Person>[] = [
     label: 'Number',
     sortable: false,
     visibilityLevel: 'essential',
-    render: (p) => (
+    render: (p) => {
-      <span className="text-muted-foreground truncate">{p.mobile || p.phone || '—'}</span>
+      const mobile = sf(p, 'mobile') ?? p.mobile;
-    ),
+      const phone = sf(p, 'phone') ?? p.phone;
+      return <span className="text-muted-foreground truncate">{mobile || phone || '—'}</span>;
+    },
   },
   {
     key: 'email',
     label: 'Email',
     sortable: true,
     visibilityLevel: 'essential',
-    render: (p) => (
+    render: (p) => {
-      <span className="text-muted-foreground truncate">{p.email || '—'}</span>
+      const email = sf(p, 'email') ?? p.email;
-    ),
+      return <span className="text-muted-foreground truncate">{email || '—'}</span>;
+    },
   },
   {
     key: 'job_title',
@@ -132,10 +146,10 @@ const columns: ColumnDef<Person>[] = [
     sortable: true,
     visibilityLevel: 'filtered',
     render: (p) => {
-      const parts = [p.job_title, p.company].filter(Boolean);
+      const jobTitle = sf(p, 'job_title') ?? p.job_title;
-      return (
+      const company = sf(p, 'company') ?? p.company;
-        <span className="text-muted-foreground truncate">{parts.join(', ') || '—'}</span>
+      const parts = [jobTitle, company].filter(Boolean);
-      );
+      return <span className="text-muted-foreground truncate">{parts.join(', ') || '—'}</span>;
     },
   },
   {
@@ -143,12 +157,14 @@ const columns: ColumnDef<Person>[] = [
     label: 'Birthday',
     sortable: true,
     visibilityLevel: 'filtered',
-    render: (p) =>
+    render: (p) => {
-      p.birthday ? (
+      const birthday = sf(p, 'birthday') ?? p.birthday;
-        <span className="text-muted-foreground">{format(parseISO(p.birthday), 'MMM d')}</span>
+      return birthday ? (
+        <span className="text-muted-foreground">{format(parseISO(birthday), 'MMM d')}</span>
       ) : (
         <span className="text-muted-foreground">—</span>
-      ),
+      );
+    },
   },
   {
     key: 'category',