Update PDF generation to match reference design and improve alignment

Revert PDF cell padding and text alignment to match the reference design, ensuring centered content and vertical alignment.

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

@@ -815,7 +815,7 @@ export async function renderSchedulePdf(input: RenderPdfInput): Promise<Buffer>
   const headerWidths = isRtl ? [...colWidths].reverse() : colWidths;
 
   const cellPadX = 4;
-  const cellPadY = 2;
+  const cellPadY = 0;
   const lineHeight = input.font.fontSize * 1.05;
 
   function drawHeader(): number {
@@ -862,7 +862,7 @@ export async function renderSchedulePdf(input: RenderPdfInput): Promise<Buffer>
       {
         text: htmlToPlain(isRtl ? meeting.titleAr : meeting.titleEn || meeting.titleAr) +
           (meeting.location ? `\n${meeting.location}` : ""),
-        align: isRtl ? "right" : "left",
+        align: "center",
       },
       {
         text:
@@ -896,7 +896,7 @@ export async function renderSchedulePdf(input: RenderPdfInput): Promise<Buffer>
                 flushGroup();
                 return parts.join("\n");
               })(),
-        align: isRtl ? "right" : "left",
+        align: "center",
       },
       {
         text: formatTimeRange(meeting.startTime, meeting.endTime, input.lang),
@@ -992,7 +992,9 @@ export async function renderSchedulePdf(input: RenderPdfInput): Promise<Buffer>
       const c = cells[i];
       const cellW = widths[i] - cellPadX * 2;
       const textLines = 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 tl of textLines) {
         if (y >= rowBottom) break;
         if (!tl) { y += lineHeight; continue; }