Header: show Civi stage label prominently; restore current_stage readonly in Stage 0

- New STAGE_OPTION_GROUP_ID constant (=75) added to config and consumed
  by both the in-card readonly and the header. Because the field carries
  optionGroupId, /api/data auto-includes the Stage option group in its
  parallel fetch (via the existing optionGroupIds derivation).
- SubmissionContextHeader: dropped the small inline 'Stage Organizing'
  line. Replaced with an uppercase 'Current stage' eyebrow next to the
  progress dots, followed by a display-font 20/24px leaf-toned label
  underneath. Resolves the stored option value ('Organizing') to its
  Civi option label ('Stage 1 — Convene & Prepare') via the new
  resolveStageLabel helper; falls back to the raw value if the option
  group hasn't loaded.
- Stage 0 'Check-in (organizing)' section: re-added a current_stage
  readonly field at the top. With optionGroupId set, FieldRenderer's
  readonly branch resolves the value to the Civi label for display.

components/EngagementForm.tsx

@@ -17,6 +17,7 @@ function sectionForField(
   return undefined;
 }
 import { evaluate } from "@/lib/conditional";
+import { STAGE_OPTION_GROUP_ID } from "@/config/form";
 import { StageSection } from "./StageSection";
 import { loadDraft, saveDraft, clearDraft } from "@/lib/draft";
 
@@ -283,7 +284,7 @@ export function EngagementForm({ config, cid, cs }: EngagementFormProps) {
     <form onSubmit={handleSubmit(onSubmit, onInvalid)} className="space-y-5" noValidate>
       <SubmissionContextHeader
         orgName={load.data.orgName}
-        currentStage={load.data.currentStage}
+        currentStageLabel={resolveStageLabel(load.data.currentStage, load.data.options)}
         currentRank={currentRank}
       />
 
@@ -339,11 +340,11 @@ export function EngagementForm({ config, cid, cs }: EngagementFormProps) {
 
 function SubmissionContextHeader({
   orgName,
-  currentStage,
+  currentStageLabel,
   currentRank,
 }: {
   orgName: string;
-  currentStage: string;
+  currentStageLabel: string;
   currentRank: number;
 }) {
   return (
@@ -352,17 +353,34 @@ function SubmissionContextHeader({
       <h1 className="mt-1 font-display text-3xl font-medium leading-tight tracking-tight text-ink sm:text-[34px]">
         {orgName}
       </h1>
-      <div className="mt-3 flex items-center gap-3">
+      <div className="mt-4 flex items-center gap-3">
         <StageProgress currentRank={currentRank} />
-        <span className="text-sm text-ink-soft">
-          <span className="text-ink-mute">Stage</span>{" "}
-          <span className="font-medium text-leaf-800">{currentStage || "—"}</span>
+        <span className="text-[10px] uppercase tracking-[0.16em] font-medium text-ink-mute">
+          Current stage
         </span>
       </div>
+      <p className="mt-1.5 font-display text-xl sm:text-2xl font-medium leading-tight tracking-tight text-leaf-800">
+        {currentStageLabel || "—"}
+      </p>
     </header>
   );
 }
 
+/**
+ * Resolve a Stage option-value (e.g. "Organizing") to its Civi option label
+ * (e.g. "Stage 1 — Convene & Prepare"). Falls back to the raw value if the
+ * option group hasn't loaded or the value isn't in the group.
+ */
+function resolveStageLabel(
+  value: string,
+  options: Record<number, { value: string; label: string }[]> | undefined,
+): string {
+  if (!value) return "";
+  const group = options?.[STAGE_OPTION_GROUP_ID];
+  if (!group) return value;
+  return group.find((o) => o.value === value)?.label ?? value;
+}
+
 /**
  * Six small dots representing the six stages, with the current rank filled
  * and earlier ranks marked as visited. Quietly conveys progression without