fix(audit): A1/A2/A4/A6/A8/A9/A16/A17/A19/A20 from 2026-05-15 sweep

Knocks out 10 of the 13 known issues from yesterday's Playwright audit.

A4 — Client form silently rejected submit when a contact row had an
empty value. The F19 filter ran in mutationFn after zod's
handleSubmit had already short-circuited on min(1). Now wraps the
onSubmit to prune empty rows BEFORE handleSubmit/zod sees them.

A16 — File upload to documents hub root 400'd because FormData.get
returns null for absent fields and zod's .optional() rejects null.
Route handler now coerces null/empty → undefined before parse.

A17 — Added /api/v1/me/ports endpoint that any authenticated user
can hit; client.ts now uses it as the bootstrap port-slug→port-id
resolver. Eliminates the wasteful 400s sales-reps and viewers were
firing on every page load against the super-admin-gated /admin/ports.

A1 — Filter permission_denied actions from the dashboard activity
feed. Still in the audit log; just not noise on the dashboard.

A2 — New LEGACY_STAGE_REMAP table + canonicalizeStage / stageLabelFor
helpers in lib/constants. Activity-feed maps legacy 9-stage enum
values (deposit_10pct, contract_sent, etc.) to their 7-stage labels
on the way out, so historical audit rows read as "Deposit Paid" not
"Deposit 10Pct".

A19 — Same-stage write now returns 204 No Content. Service returns
a STAGE_NOOP sentinel; the route handler translates it.

A9 — Catch-up wizard now derives stage from berth status (under_offer
→ EOI, sold → contract) with a stageOverride state for explicit
user picks. Avoids the set-state-in-effect rule violation.

A20 — OwnerPicker shows a "Client / Company" hint chip on the
trigger when no value is set, so users know the trigger opens a
two-tab picker instead of just a client list.

A8 — Migration 0066 normalizes legacy `statusOverrideMode = 'auto'`
to NULL so the column lives at strictly 3 states.

A6 — file-preview-dialog gets a screen-reader DialogDescription so
the Radix "Missing aria-describedby" warning stops firing on every
preview.

A18 closed as not-a-bug: /api/v1/users genuinely doesn't exist
(Next returns 404); /api/v1/admin/audit exists and 403s.

A5 (Socket.IO dev noise) + A3 (react-grab CSP) left for a separate
pass — both are dev-only cosmetic.

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

src/lib/constants.ts

@@ -38,6 +38,54 @@ export const STAGE_LABELS: Record<PipelineStage, string> = {
   contract: 'Contract',
 };
 
+/**
+ * Map legacy 9-stage enum values to their 7-stage equivalents. Audit logs
+ * and any pre-migration data still carry the legacy values; this lets the
+ * activity feed, audit diffs, and reporting render the modern label
+ * without having to back-fill the underlying rows.
+ *
+ * Mirrors the migration applied in `seed-synthetic-data.ts` (and
+ * documented in the 9→7 pipeline refactor):
+ *   details_sent      → enquiry
+ *   in_communication  → qualified
+ *   eoi_sent, eoi_signed → eoi (doc-status carries sent/signed sub-state)
+ *   deposit_10pct     → deposit_paid
+ *   contract_sent, contract_signed → contract
+ *   completed         → contract (with outcome=won)
+ *   open              → enquiry (legacy alias for the initial stage)
+ */
+export const LEGACY_STAGE_REMAP: Record<string, PipelineStage> = {
+  open: 'enquiry',
+  details_sent: 'enquiry',
+  in_communication: 'qualified',
+  eoi_sent: 'eoi',
+  eoi_signed: 'eoi',
+  deposit_10pct: 'deposit_paid',
+  contract_sent: 'contract',
+  contract_signed: 'contract',
+  completed: 'contract',
+};
+
+/**
+ * Resolve any stage-like string to a canonical 7-stage value. Returns
+ * the modern stage as-is, maps legacy values via LEGACY_STAGE_REMAP,
+ * and falls back to 'enquiry' for genuinely unknown values.
+ */
+export function canonicalizeStage(value: string | null | undefined): PipelineStage {
+  if (!value) return 'enquiry';
+  if (PIPELINE_STAGES.includes(value as PipelineStage)) return value as PipelineStage;
+  return LEGACY_STAGE_REMAP[value] ?? 'enquiry';
+}
+
+/**
+ * Human-friendly label for any stage-like string — modern or legacy. Use
+ * this in any read surface (activity feed, audit diff, notification copy,
+ * reports) that might be handed pre-migration data.
+ */
+export function stageLabelFor(value: string | null | undefined): string {
+  return STAGE_LABELS[canonicalizeStage(value)];
+}
+
 // Compact labels for cramped contexts (mobile chart axes, dense tables).
 export const STAGE_SHORT_LABELS: Record<PipelineStage, string> = {
   enquiry: 'Enquiry',