fix(invoices): invoice PDF draft stamp, page breaks, wrapping, units, multi-line descriptions (#2369)

* fix(invoices): draft stamp out of flow, page-break control, whole-word wrapping, English units, multi-line descriptions

A user reported five things about the invoice PDF after the English
translation shipped:

- The yellow draft banner pushed the whole document down, so a draft
  previewed differently from the final invoice. It is now a small stamp in
  the page's top margin (absolute, fixed), repeated on every page, out of
  the flow.
- Table rows, totals, the payment box and the notice boxes could split
  across a page break, and a section heading could be left alone at the
  bottom of a page. Those blocks now carry wrap={false}; headings and the
  table header carry minPresenceAhead.
- react-pdf hyphenated Swedish words with English patterns ("Septem-ber").
  Descriptions, notes, notices and the footer now wrap whole words.
- "st" printed verbatim on an English invoice. The editor's known units map
  to English labels at render time; user-typed units print as stored.
- Descriptions were single-line inputs, so a user could never choose where
  a line breaks. The editor field is now an auto-growing textarea; the PDF
  and the on-screen views keep the line breaks; the Peppol item name
  collapses them (single-line field).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BuYbae3WWwYzBucTUVayoW

* fix(invoices): keep long tokens printable and oversize text splittable in the invoice PDF

Skeptic findings on the first commit:

- A word wider than its column was dropped from the page or overprinted the
  quantity column, because the no-hyphenation callback gave react-pdf no
  break point inside it. Words up to 16 characters still wrap whole; longer
  tokens (URLs, e-mail addresses, references) break after separators and
  every 16 characters.
- wrap={false} on a text row or notes taller than a page clipped everything
  past the page edge. Line descriptions and notes are now kept together only
  while a line estimate says they fit; past that they split.
- A multi-line description reached the periodisering voucher text and broke
  the SIE export (one record per line). The accrual builder and the Peppol
  item name share toSingleLine(); the SIE writer collapses line breaks in
  quoted text as a format guard.
- The English no-number draft stamp ended 1.3pt below the top margin.

Tests lay the document out with @react-pdf/layout and assert that no text
node ends past the page edge and that every line's ink stays inside its
column, for 80-line descriptions and notes, a 3000-character description,
and four long tokens.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BuYbae3WWwYzBucTUVayoW

* fix(invoices): count rendered lines and cap the kept-together budget so no font can clip a row

Skeptic cycle 2: with the bundled Source Serif 4 font (13.7pt per line)
and a description of 20 source lines of wide glyphs, the estimate said
"fits" while the chunked token wrapping produced 58 rendered lines; the
non-splittable row then ran off the page. The estimate now counts the
chunks a long token is broken into, and the cap is 12 lines: at 20pt per
line that is under a third of the page for any font a company can pick.

The page-edge test now measures absolute positions (box.top is
parent-relative) and covers the bundled serif case through
prepareInvoiceFont().

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BuYbae3WWwYzBucTUVayoW

* fix(invoices): keep words whole by estimated ink width, not a character cap

Skeptic cycle 2 (regression): the flat 16-character cap gave react-pdf a
break point inside ordinary Swedish compounds (Fastighetsskötse-l,
Företagsförsäkri-ng), which the breaker used whenever it filled the line
better. Words are now kept whole whenever a rough per-glyph width estimate
says they fit the column; only a token wider than the column gets parts,
after separators and where the column is full. The page-fit estimate uses
the same widths.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BuYbae3WWwYzBucTUVayoW

* fix(invoices): estimate word width from real Helvetica metrics

Skeptic cycle 3: the hand-rolled per-glyph estimate over-counted ordinary
lowercase (6.5pt for a 5.56pt glyph), so 24 to 28 character compounds
(Momskompensationsansökan, Mervärdesskattedeklarationen) were still handed
a break point while they fit the column, and under-counted rare glyphs
(æ, œ, Cyrillic) so a token of those could overflow. The estimate now uses
Helvetica advances measured through react-pdf's own metrics
(lib/invoices/pdf-glyph-widths.ts) with a 10% margin for the bundled
fonts, and counts any glyph outside Helvetica at the widest Latin advance.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BuYbae3WWwYzBucTUVayoW

* docs(invoices): state the bundled-font width margin accurately

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BuYbae3WWwYzBucTUVayoW

* fix(invoices): review round: SIE backslash escaping, text-row budget, ROT/RUT box keep-together

- CodeQL: the SIE quoted-text escaper left backslashes alone while backslash
  is the escape character. It now writes a literal backslash as two, and the
  parser unescapes both that and the escaped quote, so text round-trips.
- CodeRabbit: a free-text row renders at full table width but was budgeted
  at the description column, so it could split unnecessarily. It uses the
  full-width budget now.
- CodeRabbit: the ROT/RUT box was unconditionally kept on one page although
  its per-line breakdown carries the (possibly multi-line) descriptions. It
  uses the same keep-together estimate as rows and notes, and its line texts
  wrap whole words.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BuYbae3WWwYzBucTUVayoW

---------

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

lib/import/__tests__/sie-parser.test.ts

@@ -265,6 +265,23 @@ describe('parseSIEFile', () => {
       expect(v1.description).toBe('Faktura 1001')
     })
 
+    it('unescapes \\" and \\\\ in quoted text, as the export writes them', () => {
+      const content = [
+        '#FLAGGA 0',
+        '#SIETYP 4',
+        '#FORMAT PC8',
+        '#FNAMN "Test AB"',
+        '#RAR 0 20240101 20241231',
+        '#VER A 1 20240115 "Sökväg C:\\\\temp\\\\\\"fil\\""',
+        '{',
+        '#TRANS 1930 {} 100.00',
+        '#TRANS 3001 {} -100.00',
+        '}',
+      ].join('\n')
+      const result = parseSIEFile(content)
+      expect(result.vouchers[0].description).toBe('Sökväg C:\\temp\\"fil"')
+    })
+
     it('parses #TRANS lines within a voucher', () => {
       const result = parseSIEFile(SIE_WITH_VOUCHERS)
       const v1 = result.vouchers[0]

lib/import/sie-parser.ts

@@ -265,7 +265,9 @@ function parseStringField(field: string): string {
 
   // Remove surrounding quotes if present
   if (field.startsWith('"') && field.endsWith('"')) {
-    return field.slice(1, -1).replace(/\\"/g, '"')
+    // `\"` is a literal quote and `\\` a literal backslash (what the export
+    // in lib/reports/sie-export.ts writes).
+    return field.slice(1, -1).replace(/\\(["\\])/g, '$1')
   }
 
   return field