feat(t-paliad-135): print stylesheet — hide chrome, forms, buttons; show only result content

When the user prints (browser dialog or any Drucken button) the page now
strips everything except the actual result content. Hidden: sidebar nav,
bottom-nav, top header, footer, breadcrumbs, all forms (.tool-input,
.filter-row, .entity-controls, search bars, gebühren-lookup, etc.), the
Fristenrechner pathway-fork buttons, B1 decision-tree cascade, B1/B2 mode
toggle, view toggle, result-action buttons, every <button>. Visible:
timeline / columns view / cost breakdown / gericht cards / entity tables
/ glossar entries / checklist items, plus the page heading + subtitle so
the printed page is identifiable.

Per-page print rules above (kostenrechner / gebühren / checklisten /
gerichte) keep their existing specifics; this block is the catch-all for
chrome those rules miss.

Verified via Playwright print emulation on /dashboard, /tools/kostenrechner,
/tools/fristenrechner (Verfahrensablauf list + Spalten view), /events.

frontend/src/styles/global.css

@@ -9819,3 +9819,112 @@ dialog.quick-add-sheet::backdrop {
     }
 }
 
+/* ============================================================================
+   t-paliad-135 — Universal print stylesheet
+   Print only the result content. Hides site chrome (sidebar / top header /
+   bottom-nav / footer / modals / breadcrumbs), all forms, filter rows,
+   search bars, the Fristenrechner pathway fork + decision tree + view toggle,
+   and every <button>. Result panels (timeline, columns view, cost breakdown,
+   gericht cards, entity tables, glossar entries, checklist items) print as-is.
+   Per-page print rules above this block handle their specific tweaks; this
+   block is the catch-all for chrome that those rules miss.
+   ============================================================================ */
+@media print {
+    .header,
+    .footer,
+    .sidebar,
+    .sidebar-hamburger,
+    .sidebar-overlay,
+    .bottom-nav,
+    .modal-overlay,
+    .modal,
+    .quick-add-sheet,
+    .projekt-breadcrumb,
+    .nav-lang,
+    .tool-input,
+    .filter-row,
+    .entity-controls,
+    .gerichte-controls,
+    .checklist-filters,
+    .gebuehren-lookup,
+    .gebuehren-tabs,
+    .gebuehren-versions,
+    .glossar-search-wrap,
+    .entity-search-wrap,
+    .team-filter-row,
+    .admin-team-filter-row,
+    .fristen-pathway-fork,
+    .fristen-pathway-back,
+    .fristen-mode-toggle,
+    .fristen-b1-cascade,
+    .fristen-search,
+    .fristen-search-chips,
+    .fristen-view-toggle,
+    .fristen-result-actions,
+    .fristen-header-actions,
+    .event-picker-row,
+    .date-input-group,
+    .wizard-step-hint,
+    #step-1,
+    #step-2,
+    #event-step-1,
+    #event-step-2,
+    button {
+        display: none !important;
+    }
+
+    .has-sidebar,
+    body.has-sidebar,
+    body.has-sidebar.sidebar-pinned,
+    :root.sidebar-pinned .has-sidebar {
+        padding-left: 0 !important;
+    }
+
+    main {
+        margin: 0 !important;
+        padding: 0 !important;
+        width: 100% !important;
+        max-width: 100% !important;
+    }
+
+    /* Re-expose page heading + subtitle on pages that don't ship a dedicated
+       .print-header (Kostenrechner has one and hides .tool-header in its
+       page-specific block above; everywhere else the .tool-header h1/p
+       identifies the print). */
+    body:not(:has(.print-header)) .tool-header {
+        display: block !important;
+    }
+
+    .print-header,
+    .print-footer {
+        display: block !important;
+    }
+
+    .tool-results,
+    .sidebar,
+    .bottom-nav {
+        position: static !important;
+    }
+
+    .timeline,
+    .timeline-item,
+    .fr-columns-view,
+    .gericht-card,
+    .entity-table,
+    .result-card,
+    .checklist-group {
+        page-break-inside: avoid;
+        break-inside: avoid;
+    }
+
+    body {
+        background: #fff !important;
+        color: #000 !important;
+    }
+
+    @page {
+        size: A4;
+        margin: 1.5cm;
+    }
+}
+