Fix Monolith and Cobalt Stripe closing-block squeeze; guard Monolith flow notes

When only the closing block moved to page 2, the page-1 deficit was shared across every gap, including the closing block's own gaps, which cannot help page 1. Page 1 then came out a few points short and the totals spilled over with the closing block. Monolith and Cobalt Stripe now squeeze only the page-1 gaps in that case, as Marble and Highlighter already do.

Monolith's flow notes block could start in the last few points of a page and be cut into zero-height lines. It now holds 70 pt of room under its label first, as Marble does.

Adds tests for both cases (they failed before the fix) and notes in the template specs. Fingerprint goldens and thumbnails are unchanged.

src/pdf/templates/monolith/Layout.tsx

@@ -21,6 +21,9 @@ import { CANCELLED_INK, CANCELLED_SENTENCE } from "../neutral/plan";
 import { atRate, LABEL_GAP, NOTES_FLOW_GAP, paymentRows, planMonolith, REVERSE_GAP, roleOf, signatureOptions, type MonolithPlan } from "./plan";
 import type { MonolithVariant } from "./tokens";
 
+/** Room that must remain under the notes' label and first line, so the next lines are not squeezed into the page foot. */
+const NOTES_HOLD = 70;
+
 /** Layout-tree ids of the blocks that are Monolith's own (the harness ids are in classic/ids.ts). */
 export const BRAND_ID = "monolith-brand";
 export const IDS_ID = "monolith-ids";
@@ -348,11 +351,16 @@ export function MonolithBody({ model, frame, logo, prefs, variant: v }: Template
   const plan = planMonolith(model, frame, v, logo, includesName({ model, prefs }));
   const ctx: Ctx = { model, plan, v, logo };
   const r = v.roles;
-  const notesFlow: ReactNode = plan.closing.notesBeside || plan.closing.notes.length === 0 ? null : (
-    <View style={{ marginTop: NOTES_FLOW_GAP }}>
-      <Notes ctx={ctx} width={plan.W} />
-    </View>
-  );
+  const notesFlow: ReactNode =
+    plan.closing.notesBeside || plan.closing.notes.length === 0 ? null : (
+      <>
+        {/* A block that starts with less than a line of room left is cut into zero-height lines: it starts on the next page instead. */}
+        <TableGuard {...{ minPresenceAhead: NOTES_FLOW_GAP + NOTES_HOLD }} />
+        <View style={{ marginTop: NOTES_FLOW_GAP }}>
+          <Notes ctx={ctx} width={plan.W} />
+        </View>
+      </>
+    );
   return (
     <>
       <FirstPageHeader pad={frame.pad}>