Fix header overlap in invoice PDF and Bongbetic wordmark on light theme

react-pdf wraps text once at the first flex measure; when yoga then shrank
the vendor column the cached lines ran under the INVOICE meta column. The
header now pins column widths (299 + 24 + 192 pt), sizes the logo from its
own aspect (stacked above the text when it would leave under 160 pt), uses
absolute per-Text line heights, and turns hyphenation off.

Also: repeating table header with an orphan-header guard, wrap=false rows,
Page n of N footer, GSTIN printed only when present, one Text per address
line, HTML twin header grid. The light-theme header showed the white-text
wordmark; the ternary was inverted.

Adds vitest + pdfjs-dist harness that fails on the old document (address
overlaps Invoice No.) and passes on the new one.

src/lib/pdf.tsx

@@ -1,5 +1,6 @@
 import { pdf } from "@react-pdf/renderer";
 import { save } from "@tauri-apps/plugin-dialog";
+import { registerPdfFonts } from "../pdf/fonts";
 import { InvoiceDocument, type InvoicePdfProps } from "../pdf/InvoiceDocument";
 import { api } from "./api";
 import type { BankAccount, Invoice, Settings } from "./types";
@@ -64,6 +65,7 @@ export async function buildPdfProps(
 
 /** Render props straight to a PDF blob. */
 export async function renderPdfBlob(props: InvoicePdfProps): Promise<Blob> {
+  registerPdfFonts();
   return pdf(<InvoiceDocument {...props} />).toBlob();
 }