Fix PDF formatting: subheading groups, vertical centering, "#" header (Task #361)

- Changed attendee subheading formatting from inline join to grouped with
  newline separators between subheading sections. Each subheading now appears
  on its own line above its group of attendees.
- Added vertical centering for short cells (# column, time column, single-line
  titles) using vOffset calculation based on content height vs row height.
- "#" column header label already applied in pdf-labels.ts (from earlier edit).
- Verified: logo embeds correctly when uploaded, row colors render from
  ROW_COLOR_FILL map, footer shows "مقيد" + date, no gaps between rows.
- Code review PASSED, e2e tests PASSED (both AR and EN PDF generation).

artifacts/api-server/src/lib/pdf-labels.ts

@@ -25,7 +25,7 @@ export const PDF_LABELS: Record<PdfLang, PdfLabels> = {
   ar: {
     // Verbatim from the printed sample the user supplied.
     title: "قائمة بأسماء حضور الاجتماعات",
-    no: "م",
+    no: "#",
     meeting: "الاجتماع",
     attendees: "الحضور",
     time: "الوقت",

artifacts/api-server/src/lib/pdf-renderer.ts

@@ -778,35 +778,29 @@ export async function renderSchedulePdf(input: RenderPdfInput): Promise<Buffer>
           meeting.attendees.length === 0
             ? "—"
             : (() => {
-                // Walking person counter — each subheading starts a
-                // fresh numbered section, so persons restart at 1- after
-                // every subheading. Same logic as the on-screen
-                // AttendeeFlow and the client print page.
                 let personIdx = 0;
-                return meeting.attendees
-                  .map((a) => {
-                    const isSub = (a.kind ?? "person") === "subheading";
-                    const name = htmlToPlain(a.name);
-                    if (isSub) {
-                      // Reset the in-section counter so the next person
-                      // starts at 1.
-                      personIdx = 0;
-                      // Brackets keep subheadings visually distinct in the
-                      // monospace plain-text PDF cell where bold/colour
-                      // can't carry. Adapter prefix is non-numeric so a
-                      // human reader can scan it as "section label".
-                      return `— ${name} —`;
+                const parts: string[] = [];
+                let currentGroup: string[] = [];
+                for (const a of meeting.attendees) {
+                  const isSub = (a.kind ?? "person") === "subheading";
+                  const name = htmlToPlain(a.name);
+                  if (isSub) {
+                    if (currentGroup.length > 0) {
+                      parts.push(currentGroup.join("  "));
                     }
+                    personIdx = 0;
+                    parts.push(`— ${name} —`);
+                    currentGroup = [];
+                  } else {
                     personIdx += 1;
                     const t = a.title?.trim();
-                    return `${personIdx}- ${name}${t ? ` (${t})` : ""}`;
-                  })
-                  // Inline join: attendees flow as one paragraph per cell
-                  // (wrapped naturally by pdfkit) instead of one-per-line.
-                  // This keeps the table compact so the schedule fits on a
-                  // single page when possible. Subheadings still get their
-                  // own line via the leading "\n" below.
-                  .join("  ");
+                    currentGroup.push(`${personIdx}- ${name}${t ? ` (${t})` : ""}`);
+                  }
+                }
+                if (currentGroup.length > 0) {
+                  parts.push(currentGroup.join("  "));
+                }
+                return parts.join("\n");
               })(),
         align: alignment(input.font, isRtl),
       },
@@ -900,13 +894,14 @@ export async function renderSchedulePdf(input: RenderPdfInput): Promise<Buffer>
     }
     doc.restore();
 
-    // Draw cell contents.
     cx = tableX;
     for (let i = 0; i < cells.length; i++) {
       const c = cells[i];
       const cellW = widths[i] - cellPadX * 2;
       const lines = c.text.split("\n");
-      let y = rowTop + cellPadY;
+      const contentH = cellHeights[i] - cellPadY * 2;
+      const vOffset = Math.max(0, (rowHeight - cellPadY * 2 - contentH) / 2);
+      let y = rowTop + cellPadY + vOffset;
       for (const line of lines) {
         if (!line) {
           y += lineHeight;