Invoice set pricing: wire editor + align editor/backend contract

Front-end (fis.inv_shared.js / fis.inv_txt_de.js, rebuilt bundles):
- 3-way set display switch (setprice/itemprices/setonly) via admin.setmode,
  emitted into InvoiceOptions by FdsInvoiceData.BuildInvoiceOptions.
- Each request block now posts items[] in the backend contract shape
  (title/desc/qty/price_net/total_net + set type/setId tags) via itemToContract.
- invcPayload normalises the editor model to the field names BuildInvoiceParams
  reads (sms totals -> new.total_net/total_gross, invoicetitle->title,
  loc->provisionlocation, admin.paymentterms->new.paymentterm, CustomerId->customerid).

Back-end:
- BuildInvoiceOptions adds the setmode token alongside §13b.
- VAT rate+amount now taken from sms.vat (HighestVat) instead of the broken
  items 'is List<object>' detection that pinned the rate to 19.
- InvoiceSetPricing blanks price/total cells for text/title heading lines.

Tests: set-pricing text-line blanking, HighestVat selection/parsing, updated
the VAT param test to the sms.vat contract. 180 passing.

Note: the second VAT slot (InvoiceVAT_2) stays unused by design; mixed-rate
invoices store only the highest rate (pre-existing, accepted).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Fuchs/js/intranet/modules/fis.inv_shared.js

@@ -96,6 +96,9 @@ $inv.eM = (r, re, opt) => {
     if ((opt || '').split(',').includes('p13b') === true) {
         m.push({ lbl: $ict.p13b, fnc: $inv.sp13b });
     }
+    if ((opt || '').split(',').includes('setm') === true) {
+        m.push({ lbl: $ict.setm, fnc: $inv.ssetmode });
+    }
     if (booln(r, false) === true) {
         m.push({ lbl: $ict.rel, fnc: $inv.rReload });
     }
@@ -258,7 +261,7 @@ $inv.ccInv = function (ev) {  //normale rechnung
             rif.tbl.children('tbody').each($inv.bdysort);
             rif.tbl.trigger('fds.inv');  /* trigger calculations */
 
-            $inv.eM(false, true, 'iss,p13b,ctp');
+            $inv.eM(false, true, 'iss,p13b,setm,ctp');
         }, complete: () => {
             o.c.trigger('modal_close');
         }
@@ -403,7 +406,7 @@ $inv.cntInv = function (data) {  //invoice continuation
 
             rif.tbl.children('tbody').each($inv.bdysort);
             rif.tbl.trigger('fds.inv');  /* trigger calculations */
-            $inv.eM(false, true, 'iss,p13b,ctp');
+            $inv.eM(false, true, 'iss,p13b,setm,ctp');
         }, complete: () => {
             o.c.trigger('modal_close');
         }
@@ -646,12 +649,19 @@ $inv.invSumUpdate = function () {
     };
     let bds = tbl.children('tbody');
     bds.each((bi, bdy) => {
-        let b = $(bdy), rx = b.data() || {}, i = [], bnet = 0, itm = b.find('tr.itm'), iso = 0, ipos = 0;
+        let b = $(bdy), rx = b.data() || {}, i = [], citems = [], cset = null, bnet = 0, itm = b.find('tr.itm'), iso = 0, ipos = 0;
         b.tC('empty', itm.length < 1);
         itm.each((ti, tx) => {
-            
+
             let rrx = $(tx).data() || {}; csms(rrx, sms, rx.Id); bnet += (rrx.net_val || 0); i.push(rrx.co);
             //console.debug('rrx %o', rrx);
+            /* backend item contract (title/desc/qty/price_net/total_net + set flags), see InvoiceSetPricing.
+               Set grouping: an item of Type 'set' is a header that claims the following items in this
+               block as its members until the next set header (mfr__items has no explicit member link). */
+            let citem = $inv.itemToContract(rrx);
+            if (citem.type === 'set' && citem.id !== '') { cset = citem.id; }
+            else if (cset !== null && (citem.id || '') !== '') { citem.setId = cset; }
+            citems.push(citem);
             if (((typeof rrx.SortOrder === 'undefined' || rrx.SortOrder === null) ? -1 : rrx.SortOrder) > -1) {
                 if (['text', 'title'].includes((rrx.Type || 'other').toLowerCase()) === false) { ipos++; }
                 rrx.SortOrder = iso;
@@ -663,7 +673,7 @@ $inv.invSumUpdate = function () {
         //    f: b.find('tr.isum > td.isumval'), t: fnum(bnet, $rct.cst), n: bnet
         //});
         b.find('tr.isum > td.isumval').text(fnum(bnet, $rct.cst));
-        ba.push({ Id: rx.Id, nme: rx.Name, text: rx.text, itm: i, netval: bnet });
+        ba.push({ Id: rx.Id, nme: rx.Name, text: rx.text, itm: i, items: citems, netval: bnet });
     });
     let nonempty = tbl.find('tbody:not(.empty)').length;
     bds.find('tr.isum').tC('hidden', nonempty < 2);
@@ -838,6 +848,53 @@ $inv.sp13b = () => {
     }
     tbl.trigger('fds.inv');
 };
+/* Maps an item row's data to the backend item contract consumed by InvoiceSetPricing
+   / FuchsPdf.ApplyInvoice: { id, type, title (plain), desc (html), qty, price_net,
+   total_net, vat }. Set membership (type:'set' header + setId on members) is added by
+   the caller. The invoice total comes from the registration balance, so per-item
+   totals here are purely presentational. */
+$inv.itemToContract = function (rrx) {
+    rrx = rrx || {};
+    let oHtml = (e) => $$.d().append(e).html();
+    let type = (rrx.Type || '').toString().toLowerCase();
+    let ci = { id: (rrx.Id || '').toString(), type: type, title: '', desc: '', qty: '', price_net: '', total_net: (rrx.net_val || 0), vat: rrx.vat || '' };
+    if (rrx.co && rrx.co.typ === 'osum') {
+        /* combined single-sum line — the on-screen "title" is an HTML sub-table; render it as desc */
+        ci.desc = rrx.co.t || '';
+        ci.total_net = (rrx.net_val || 0);
+    } else if (['text', 'title'].includes(type) && (rrx.net_val || 0) === 0) {
+        /* heading / free-text line, no price */
+        ci.desc = rrx.htmltext || ((((rrx.NameOrNumber || '').substr(0, 1) !== '#') ? oHtml($$[0]('p').text(rrx.NameOrNumber || '')) : '') + (rrx.Note || ''));
+        ci.total_net = '';
+    } else {
+        /* normal priced item (incl. set headers, which carry their own set price or 0) */
+        ci.title = rrx.NameOrNumber || '';
+        ci.desc = rrx.Note || '';
+        ci.qty = rrx.quantity || ((rrx.quantityhours || 0) !== 0 ? (fnum(rrx.quantityhours) + (rrx.UnitString ? ' ' + rrx.UnitString : '')) : '');
+        ci.price_net = (rrx.net || 0);
+        ci.total_net = (rrx.net_val || 0);
+    }
+    return ci;
+};
+/* 3-way set-pricing display switch. Mirrors §13b: writes the choice onto admin.setmode,
+   which BuildInvoiceParams turns into the "setmode:<mode>" InvoiceOptions token the PDF reads. */
+$inv.ssetmode = () => {
+    let l = $('div.invoice_layout'), tbl = l.find('table.invi'), d = tbl.data();
+    d.admin = d.admin || {};
+    let cur = (d.admin.setmode || 'setprice'), o;
+    let btn = (mode) => $$.dc('btn', $ict.setmo[mode]).tC('selected', cur === mode).click(() => { o.c.trigger('modal_close'); $inv.setSetmode(mode); });
+    let fr = $$.dc('choicefrm').append([btn('setprice'), btn('itemprices'), btn('setonly')]);
+    o = $ocms.dlg(fr, { width: 800 });
+};
+$inv.setSetmode = (mode) => {
+    let l = $('div.invoice_layout'), tbl = l.find('table.invi'), d = tbl.data();
+    d.admin = d.admin || {};
+    d.admin.setmode = mode;                        /* posted in admin -> BuildInvoiceParams writes setmode: into InvoiceOptions */
+    d.inv = d.inv || {};                           /* keep a local InvoiceOptions reflection in sync (cosmetic) */
+    let opts = (d.inv.InvoiceOptions || '').split(',').filter(x => x !== '' && x.indexOf('setmode:') !== 0);
+    if (mode && mode !== 'setprice') { opts.push('setmode:' + mode); }
+    d.inv.InvoiceOptions = opts.join(',');
+};
 $inv.sctp = () => {
     let flds = $invcol.ctp;
     $ocms.dlgform(flds, {
@@ -857,12 +914,32 @@ $inv.sctp = () => {
         }, typedvalues: true
     });
 };
+/* Normalises the editor's working model into the exact field names the C# backend
+   (FdsInvoiceData.BuildInvoiceParams) reads, then returns the `invc` payload:
+   - balances/service sums come from `sms` (ttn/ttb), exposed on `new` as total_net/total_gross;
+   - every VAT rate's net amount is exposed as new.vat_<rate>_net (the backend reads the highest);
+   - new.invoicetitle -> new.title, new.loc -> new.provisionlocation, admin.paymentterms ->
+     new.paymentterm, admin.CustomerId -> admin.customerid.
+   Originals are kept alongside; the source objects are not mutated. */
+$inv.invcPayload = function (d) {
+    d = d || {};
+    let sms = d.sms || {}, nw = $.extend({}, d.new), adm = $.extend({}, d.admin);
+    nw.total_net = sms.ttn || 0;
+    nw.total_gross = sms.ttb || 0;
+    /* VAT (rate + amount) is taken by the backend straight from the posted sms.vat map
+       (FdsInvoiceData.HighestVat), so no per-rate new.vat_* keys are needed here. */
+    nw.title = (nw.invoicetitle != null ? nw.invoicetitle : (nw.title || ''));
+    nw.provisionlocation = (nw.loc != null ? nw.loc : (nw.provisionlocation || ''));
+    nw.paymentterm = (adm.paymentterms != null ? adm.paymentterms : (nw.paymentterm || ''));
+    adm.customerid = (adm.customerid != null ? adm.customerid : adm.CustomerId);
+    return { admin: adm, req: d.bai, sms: d.sms, new: nw };
+};
 $inv.ssave = () => {
     var l = $('div.invoice_layout'), d = l.find('table.invi').data();
     $inv.t_fds_inv();
     l.aC('freeze');
     $ocms.postXT({
-        url: $ocms.url('req/save'), data: { invc: JSON.stringify({ admin: d.admin, req: d.bai, sms: d.sms, new: d.new }), id: d.invid || '' }, success: (response) => {
+        url: $ocms.url('req/save'), data: { invc: JSON.stringify($inv.invcPayload(d)), id: d.invid || '' }, success: (response) => {
             $inv.cntInv({ id: response.id });
         }, error: () => {
             alert($ict.eis);
@@ -884,7 +961,7 @@ $inv.sprev = (change) => {
         }
     }
     $ocms.postXT({
-        url: $ocms.url('req/' + (change === true ?'sedit':'sprep')), data: { invc: JSON.stringify({ admin: d.admin, req: d.bai, sms: d.sms, new: d.new }), id: d.invid ||'' }, success: (response) => {
+        url: $ocms.url('req/' + (change === true ?'sedit':'sprep')), data: { invc: JSON.stringify($inv.invcPayload(d)), id: d.invid ||'' }, success: (response) => {
             l.rC('freeze');
             let c = $$.dc('imagecollection pdfpreview'), vhr = Math.round(vh() * 0.88), invid = response.id, invtp = response.total;
             if (invtp > 10) {

Fuchs/js/intranet/modules/fis.inv_txt_de.js

@@ -40,6 +40,12 @@
     eis: 'Der Rechnungsentwurf konnte nicht gespeichert werden.',
     iss: 'Zwischenstand speichern.',
     p13b: 'USt -> §13b',
+    setm: 'Set-Preisanzeige',
+    setmo: {
+        setprice: 'Set mit Preis – Positionen ohne Preis',
+        itemprices: 'Positionen mit Preis – Set als Überschrift',
+        setonly: 'Nur Set mit Preis – Positionen ausgeblendet'
+    },
     ctp: 'Ansprechpartner festlegen',
     mfr: 'Von MFR neu abrufen',
     rq1: 'Auftragsdaten werden von MFR abgerufen.\nDer Vorgang kann bis zu 90Sek dauern.',