fix(ui): humanize enum labels, format dates, resolve actor names, loading skeleton

- Documents hub signer status now renders via a label map (`Pending`,
  `Signed`, `Declined`, …) instead of the raw lowercase enum value.
- Invoice detail formats `dueDate` and `paymentDate` as `MMM d, yyyy`
  via `date-fns` instead of leaking raw `2025-03-14` ISO strings, and
  swaps the "Payment Method" free-text input for a `Select` of labelled
  options (`Bank transfer`, `Credit card`, …) so we never store
  `bank_transfer` from a hand-typed field again.
- Interest tabs `MilestoneSection` status badge uses a `humanizeStatus`
  helper so values like `waiting_for_signatures` show as
  `Waiting For Signatures` (correctly title-cased) instead of being a
  lower-snake-case fragment inside an ALL-CAPS pill.
- `OUTCOME_BADGE` in the interest header now has a fall-through that
  renders any unknown outcome as a closed-state badge, preventing a
  closed interest from looking open just because its enum was added
  upstream without a matching label entry.
- Interest timeline route joins the `user` table and returns
  `userName` alongside `userId`; the client renders the resolved name
  instead of a 36-char UUID. Falls back to `'a teammate'` if the user
  row was deleted.
- Invoice "New / Step 3 — Review" replaces the truncated UUID display
  with a server-resolved client/company name via a small `useQuery`,
  so users can confirm they picked the right billing entity before
  submitting.
- New `loading.tsx` for client detail renders a header / tab strip /
  card skeleton during the server-component / initial-query window
  that previously flashed empty.

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

src/components/interests/interest-detail-header.tsx

@@ -36,6 +36,20 @@ const OUTCOME_BADGE: Record<string, { label: string; className: string }> = {
   cancelled: { label: 'Cancelled', className: 'bg-slate-200 text-slate-700' },
 };
 
+// Catch-all so an unknown outcome (e.g. a future `lost_no_berth` enum) still
+// renders as a closed-state badge instead of falling back to the open-state
+// stage picker. Lost-* gets a rose tint; everything else gets neutral slate.
+function resolveOutcomeBadge(outcome: string | null | undefined) {
+  if (!outcome) return null;
+  const known = OUTCOME_BADGE[outcome];
+  if (known) return known;
+  const isLoss = outcome.startsWith('lost');
+  return {
+    label: outcome.replace(/_/g, ' ').replace(/\b\w/g, (m) => m.toUpperCase()),
+    className: isLoss ? 'bg-rose-100 text-rose-700' : 'bg-slate-200 text-slate-700',
+  };
+}
+
 const CATEGORY_LABELS: Record<string, string> = {
   general_interest: 'General',
   specific_qualified: 'Specific Qualified',
@@ -90,7 +104,7 @@ export function InterestDetailHeader({ portSlug, interest }: InterestDetailHeade
   const [outcomeDialog, setOutcomeDialog] = useState<null | 'won' | 'lost'>(null);
 
   const isArchived = !!interest.archivedAt;
-  const outcomeBadge = interest.outcome ? OUTCOME_BADGE[interest.outcome] : null;
+  const outcomeBadge = resolveOutcomeBadge(interest.outcome);
   const isClosed = !!interest.outcome;
 
   // Contact deep-links — resolved from the linked client's primary channels.

src/components/interests/interest-tabs.tsx

@@ -26,6 +26,12 @@ const LEAD_CATEGORY_OPTIONS = LEAD_CATEGORIES.map((c) => ({
   label: c.replace(/_/g, ' ').replace(/\b\w/g, (m) => m.toUpperCase()),
 }));
 
+// Convert raw enum values like `waiting_for_signatures` → `Waiting For Signatures`.
+function humanizeStatus(value: string | null): string | null {
+  if (!value) return null;
+  return value.replace(/_/g, ' ').replace(/\b\w/g, (m) => m.toUpperCase());
+}
+
 interface InterestTabsOptions {
   interestId: string;
   currentUserId?: string;
@@ -203,7 +209,7 @@ function MilestoneSection({
         </div>
         {status ? (
           <span className="rounded-full bg-muted px-2 py-0.5 text-[10px] font-medium uppercase tracking-wide text-muted-foreground">
-            {status.replace(/_/g, ' ')}
+            {humanizeStatus(status)}
           </span>
         ) : null}
       </header>

src/components/interests/interest-timeline.tsx

@@ -23,6 +23,8 @@ interface TimelineEvent {
   action: string;
   description: string;
   userId: string | null;
+  /** Resolved display name (server-side join). Falls back to userId when null. */
+  userName?: string | null;
   createdAt: string;
   metadata: Record<string, unknown>;
 }
@@ -56,10 +58,14 @@ function eventIcon(event: TimelineEvent) {
   return <Pencil className="h-4 w-4 text-muted-foreground" />;
 }
 
-function actorLabel(userId: string | null): string | null {
-  if (!userId) return null;
-  if (userId === 'system') return 'system';
-  return userId;
+function actorLabel(event: TimelineEvent): string | null {
+  if (event.userName) return event.userName;
+  if (!event.userId) return null;
+  if (event.userId === 'system') return 'system';
+  // Last-resort fallback when the user row was deleted: show a short token
+  // instead of a 36-char UUID. The server-side join is authoritative; this
+  // path should be rare in practice.
+  return 'a teammate';
 }
 
 export function InterestTimeline({ interestId }: InterestTimelineProps) {
@@ -100,7 +106,7 @@ export function InterestTimeline({ interestId }: InterestTimelineProps) {
       <div className="absolute left-4 top-2 bottom-2 w-px bg-border" />
 
       {events.map((event) => {
-        const actor = actorLabel(event.userId);
+        const actor = actorLabel(event);
         const isAuto = event.userId === 'system';
         return (
           <div key={event.id} className="relative flex gap-4 pb-6">