feat(sales): admin-configurable EOI signers + richer timeline events

1. Per-port EOI signer config

     - New `eoi_signers` system_settings key (JSON: { developer, approver },
       each `{ name, email }`). Settings UI exposes it under Admin → Settings.
     - getPortEoiSigners(portId) reads the setting with a typed validator;
       falls back to the legacy David Mizrahi / Abbie May defaults if the
       row is missing or malformed (so older ports keep working until an
       admin saves a value).
     - Both EOI generation pathways now read from the helper instead of
       hardcoded constants:
         * documenso-template path (generateAndSignViaDocumensoTemplate)
         * in-app PDF-fill path (generateAndSignViaInApp)

  2. Timeline upgrades

     The interest detail Activity tab now distinguishes the new automation
     events that arrived with sessions 1+2:

     - Stage auto-advances (userId='system') get a small "Auto" pill and
       carry their reason into the description (e.g. "Stage advanced to
       EOI Signed (auto-advanced — EOI signed via Documenso)").
     - outcome_set events show "Marked as Won" / "Marked as Lost — went
       to another marina" with optional reason; trophy/X icons.
     - outcome_cleared events show "Reopened to {stage}" with a refresh
       icon.
     - Document events humanized: "Document 'X' fully signed" instead
       of "Document X: completed".
     - Stage labels run through stageLabel() so the timeline shows the
       human label, not the enum key.
     - Timestamps switched to relative-time with full-date tooltip.
     - "by system" is rendered plainly (no longer the literal user-id).

tsc clean. vitest 832/832 pass.

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

src/lib/services/documenso-payload.ts

@@ -1,3 +1,7 @@
+import { and, eq } from 'drizzle-orm';
+
+import { db } from '@/lib/db';
+import { systemSettings } from '@/lib/db/schema/system';
 import type { EoiContext } from '@/lib/services/eoi-context';
 
 export interface DocumensoTemplatePayload {
@@ -52,6 +56,45 @@ const DEFAULT_APPROVER_NAME = 'Abbie May';
 const DEFAULT_APPROVER_EMAIL = 'sales@portnimara.com';
 const DEFAULT_REDIRECT_URL = 'https://portnimara.com';
 
+export interface EoiSignerConfig {
+  developer: { name: string; email: string };
+  approver: { name: string; email: string };
+}
+
+const DEFAULT_EOI_SIGNERS: EoiSignerConfig = {
+  developer: { name: DEFAULT_DEVELOPER_NAME, email: DEFAULT_DEVELOPER_EMAIL },
+  approver: { name: DEFAULT_APPROVER_NAME, email: DEFAULT_APPROVER_EMAIL },
+};
+
+function isSignerEntry(v: unknown): v is { name: string; email: string } {
+  return (
+    !!v &&
+    typeof v === 'object' &&
+    typeof (v as Record<string, unknown>).name === 'string' &&
+    typeof (v as Record<string, unknown>).email === 'string' &&
+    !!(v as Record<string, string>).name &&
+    !!(v as Record<string, string>).email
+  );
+}
+
+/** Read the per-port `eoi_signers` setting, fall back to legacy hardcoded
+ *  defaults if missing or malformed. The fallback exists to keep older
+ *  ports working until an admin saves the setting; once saved, the DB row
+ *  always wins. */
+export async function getPortEoiSigners(portId: string): Promise<EoiSignerConfig> {
+  const row = await db.query.systemSettings.findFirst({
+    where: and(eq(systemSettings.key, 'eoi_signers'), eq(systemSettings.portId, portId)),
+  });
+  const value = row?.value as Record<string, unknown> | undefined;
+  if (value && isSignerEntry(value.developer) && isSignerEntry(value.approver)) {
+    return {
+      developer: value.developer,
+      approver: value.approver,
+    };
+  }
+  return DEFAULT_EOI_SIGNERS;
+}
+
 function formatAddress(address: EoiContext['client']['address']): string {
   if (!address) return '';
   return [address.street, address.city, address.country].filter(Boolean).join(', ');