feat(pdf): add print FAB + fix color-mix via clean clone approach

- Added secondary FAB button 'Печать' with printer icon (window.print)
- Created printer.svg icon for the print button
- Added .fab-secondary__ico--print CSS class
- Fixed html2pdf color-mix() issue: buildCleanClone() creates a deep clone
  with all computed styles inlined, all stylesheets removed, and
  pseudo-elements converted to real DOM elements before passing to html2pdf
- Two separate handlers: pdfBtn for download, printBtn for print dialog

public/css/main.css

@@ -960,6 +960,12 @@ a.fab--secondary:visited {
   -webkit-mask-image: url("../assets/shared/icons/cv.svg");
 }
 
+/* ── Print FAB ── */
+.fab-secondary__ico--print {
+  mask-image: url("../assets/shared/icons/printer.svg");
+  -webkit-mask-image: url("../assets/shared/icons/printer.svg");
+}
+
 .fab--label {
   width: auto;
   padding: 0.65rem 1.1rem;