feat(cv): harden multi-page builder

Wrap pathological content, paginate oversized entries, measure A4 and Letter previews correctly, unify section ordering, and gate stored-output actions on saved state.

job-tracker-ui/src/cvBuilder.test.ts

@@ -1,4 +1,4 @@
-import { moveItem, wrapSelection } from "./cvBuilder";
+import { getCvPageCount, getCvPageMetrics, moveItem, wrapSelection } from "./cvBuilder";
 
 describe("moveItem", () => {
   test("moves an item forward", () => {
@@ -37,3 +37,17 @@ describe("wrapSelection", () => {
     expect(r.text.slice(r.selStart, r.selEnd)).toBe("docs");
   });
 });
+
+describe("CV page measurement", () => {
+  test("uses the selected physical page size", () => {
+    expect(getCvPageMetrics("a4")).toMatchObject({ widthMm: 210, heightMm: 297 });
+    expect(getCvPageMetrics("letter")).toMatchObject({ widthMm: 215.9, heightMm: 279.4 });
+  });
+
+  test("rounds layout pixels without hiding partial pages", () => {
+    const { heightPx } = getCvPageMetrics("a4");
+    expect(getCvPageCount(Math.ceil(heightPx), heightPx)).toBe(1);
+    expect(getCvPageCount(heightPx + 20, heightPx)).toBe(2);
+    expect(getCvPageCount(heightPx * 2 + 20, heightPx)).toBe(3);
+  });
+});