fix(audit-wave-9): copy/terminology sweep (copy-auditor)

Address the highest-impact items from the copy-auditor's CRITICAL +
HIGH + MEDIUM bands:

**C2 portal raw-status leak**
- Drop the staff-only `leadCategory` chip from the portal interests
  page entirely. Privacy + optics: clients should never see "hot lead"
  in their own portal. `eoiStatus` was already wrapped in
  `portalSigningLabel`; only the categorical chip remained.

**C3 signing-status label drift**
- Add `src/lib/labels/document-status.ts` as the single source of
  truth for the {draft, sent, partially_signed, completed, expired,
  cancelled} lifecycle: labels (CRM + portal variants), StatusPill
  variant, and the "active / in-flight" set.
- Wire it into interest-eoi-tab, interest-contract-tab,
  interest-reservation-tab — they previously redefined identical
  STATUS_LABELS / ACTIVE_STATUSES blocks per-file.

**H1 + M3 verbiage codemod**
- `Save Changes` → `Save changes` (sentence case, matches the
  surrounding admin/CRM pattern).
- `Saving...` (ASCII three dots) → `Saving…` (Unicode ellipsis).
  Matches the project's UTF-8-elsewhere convention and reads
  correctly via screen-readers.

**M1 envelope jargon → signing request**
- smart-archive-dialog: "Leave envelope pending" → "Leave signing
  request pending"; "Void the signing envelope" → "Cancel the signing
  request"; section header updated to match.
- document-detail: "voids the signing envelope" → "cancels the signing
  request".
- bulk-archive-wizard: "leave invoices/signing envelopes alone" →
  "leave invoices/signing requests alone".
- Documenso admin page intentionally keeps `envelope` (dev/integration
  vocabulary).

**M5 Hot Lead casing**
- Normalize `Hot Lead` / `General Interest` / `Specific Qualified` to
  sentence case in `constants.ts` LABEL_OVERRIDES and all per-file
  lead-category maps so the CRM trend (sentence case) is consistent.

**C1 surface-level rename**
- "Linked prospect (optional)" → "Linked interest (optional)" on the
  berth status-change dialog.
- "Deal Documents" tab → "Interest Documents" (URL/route kept as
  `/deal-documents` to avoid breaking deep links; rename deferred).

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

src/lib/labels/document-status.ts

@@ -0,0 +1,87 @@
+/**
+ * Canonical labels + StatusPill tones for the signing-document lifecycle.
+ *
+ * Six surfaces previously carried divergent label sets (interest-eoi-tab,
+ * interest-contract-tab, interest-reservation-tab, documents-hub,
+ * signing-progress, notification-digest, realtime-toast). A signer would
+ * see "Partially signed", "partially_signed", and "EOI fully signed" for
+ * the same enum state across one session. This module is the single
+ * source of truth — import from here, do not redefine inline.
+ *
+ * If a new lifecycle state arrives in the schema, add it here once.
+ */
+
+import type { StatusPillStatus } from '@/components/ui/status-pill';
+
+export type DocumentStatus =
+  | 'draft'
+  | 'sent'
+  | 'partially_signed'
+  | 'completed'
+  | 'expired'
+  | 'cancelled';
+
+/**
+ * Human label rendered in CRM UI (staff-facing). Use the portal-specific
+ * mapping in `documentStatusLabelForPortal` when rendering to clients —
+ * "Awaiting signatures" reads fine on the inside; clients want
+ * "Awaiting your signature".
+ */
+export const DOCUMENT_STATUS_LABELS: Record<DocumentStatus, string> = {
+  draft: 'Draft',
+  sent: 'Awaiting signatures',
+  partially_signed: 'Partially signed',
+  completed: 'Signed',
+  expired: 'Expired',
+  cancelled: 'Cancelled',
+};
+
+/**
+ * Client-portal labels. The portal previously rendered
+ * `eoiStatus.replace(/_/g, ' ')` so a client saw "EOI: partially signed".
+ * Map to action-oriented copy that the client can act on.
+ */
+export const DOCUMENT_STATUS_LABELS_PORTAL: Record<DocumentStatus, string> = {
+  draft: 'Pending',
+  sent: 'Awaiting your signature',
+  partially_signed: 'Signed (other parties remaining)',
+  completed: 'Signed',
+  expired: 'Expired',
+  cancelled: 'Cancelled',
+};
+
+/**
+ * StatusPill variant per state. Pairs with `<StatusPill status={...}>`
+ * via the shared primitive so the colour palette stays consistent with
+ * non-document status pills (berth/user/etc).
+ */
+export const DOCUMENT_STATUS_PILL: Record<DocumentStatus, StatusPillStatus> = {
+  draft: 'draft',
+  sent: 'sent',
+  partially_signed: 'partial',
+  completed: 'completed',
+  expired: 'expired',
+  cancelled: 'cancelled',
+};
+
+/**
+ * The "in-flight" set — useful for hero treatment, banners, "we're
+ * waiting on action" UI. completed/expired/cancelled are terminal.
+ */
+export const DOCUMENT_STATUS_ACTIVE: ReadonlySet<DocumentStatus> = new Set<DocumentStatus>([
+  'draft',
+  'sent',
+  'partially_signed',
+]);
+
+export function documentStatusLabel(status: string): string {
+  return DOCUMENT_STATUS_LABELS[status as DocumentStatus] ?? status;
+}
+
+export function documentStatusLabelForPortal(status: string): string {
+  return DOCUMENT_STATUS_LABELS_PORTAL[status as DocumentStatus] ?? status;
+}
+
+export function documentStatusPill(status: string): StatusPillStatus {
+  return DOCUMENT_STATUS_PILL[status as DocumentStatus] ?? 'pending';
+}