Redesign document approval flow

Replace the per-approver add/remove model with a quorum-based approval
system. Documents now have default approvers that are pre-populated when
requesting approval, and the publish dialog lets users adjust the list
before submitting.

Key changes:

- Add PENDING_APPROVAL document version status with dedicated transitions
- Introduce approval quorums with request/approve/reject/void lifecycle
- Add default approvers per document (stored in document_default_approvers)
  with MERGE-based upsert for efficient sync
- Add NoDuplicates validator for slice fields
- Split ALTER TYPE ADD VALUE migrations into separate files (required by
  PostgreSQL when run inside transactions)
- Use VOIDED consistently for both quorum status and decision state enums
- Expose void/approve/reject through GraphQL and MCP, with e2e tests
- Add approval management UI: publish dialog with approver selection,
  approval list with void support, and external approve/reject page

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

packages/ui/src/Molecules/Badge/DocumentVersionBadge.tsx

@@ -17,14 +17,23 @@ import { useTranslate } from "@probo/i18n";
 import { Badge } from "../../Atoms/Badge/Badge";
 
 type Props = {
-  state: "DRAFT" | "PUBLISHED";
+  state: "DRAFT" | "PENDING_APPROVAL" | "PUBLISHED";
 };
 
 export function DocumentVersionBadge(props: Props) {
   const { __ } = useTranslate();
-  return (
-    <Badge variant={props.state === "DRAFT" ? "neutral" : "success"}>
-      {props.state === "DRAFT" ? __("Draft") : __("Published")}
-    </Badge>
-  );
+
+  const variant = {
+    DRAFT: "neutral",
+    PENDING_APPROVAL: "warning",
+    PUBLISHED: "success",
+  } as const;
+
+  const label = {
+    DRAFT: __("Draft"),
+    PENDING_APPROVAL: __("Pending approval"),
+    PUBLISHED: __("Published"),
+  } as const;
+
+  return <Badge variant={variant[props.state]}>{label[props.state]}</Badge>;
 }