feat(documents): shared CustomFieldsPrintPicker + detail query types

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/components/document/CustomFieldsPrintPicker.tsx

@@ -0,0 +1,60 @@
+import { FormControlLabel, Checkbox, Box, Typography } from "@mui/material";
+import type { CompanySettingsCustomField } from "../../lib/queries/settings";
+
+interface Props {
+  /** Company custom field definitions, in positional order (index = print key). */
+  fields: CompanySettingsCustomField[];
+  /** Currently selected positional indices. */
+  selected: number[];
+  /** Read-only (document not editable / locked by another user). */
+  disabled?: boolean;
+  onChange: (next: number[]) => void;
+}
+
+/**
+ * Per-document picker: choose which COMPANY custom fields print on this
+ * document's PDF. Selection is positional (matches the PDF `custom_<i>` keys).
+ * Renders nothing when the company has defined no printable custom fields.
+ */
+export default function CustomFieldsPrintPicker({
+  fields,
+  selected,
+  disabled = false,
+  onChange,
+}: Props) {
+  const printable = fields.filter((f) => (f.value || "").trim());
+  if (printable.length === 0) return null;
+
+  const toggle = (idx: number, checked: boolean) => {
+    const set = new Set(selected);
+    if (checked) set.add(idx);
+    else set.delete(idx);
+    onChange([...set].sort((a, b) => a - b));
+  };
+
+  return (
+    <Box>
+      <Typography variant="subtitle2" sx={{ mb: 0.5 }}>
+        Vlastní pole na PDF
+      </Typography>
+      {fields.map((f, idx) => {
+        if (!(f.value || "").trim()) return null;
+        const label = (f.name || "").trim() ? `${f.name}: ${f.value}` : f.value;
+        return (
+          <FormControlLabel
+            key={idx}
+            control={
+              <Checkbox
+                size="small"
+                checked={selected.includes(idx)}
+                disabled={disabled}
+                onChange={(e) => toggle(idx, e.target.checked)}
+              />
+            }
+            label={<Typography variant="body2">{label}</Typography>}
+          />
+        );
+      })}
+    </Box>
+  );
+}