Use Mm rather than Inches for A4 dimensions

backend/passages/domain/document_generator.py

@@ -1,6 +1,6 @@
 import json
 import time
-from typing import Mapping, Optional, Sequence, TYPE_CHECKING
+from typing import TYPE_CHECKING, Mapping, Optional, Sequence
 
 from celery import current_task
 from doc.config import settings
@@ -19,17 +19,17 @@
     resource_types,
 )
 from doc.reviewers_guide.model import BibleReference
+from doc.utils.docx_util import ensure_reference_styles
 from doc.utils.file_utils import docx_filepath, file_needs_update
 from doc.utils.text_utils import maybe_correct_book_name
-from doc.utils.docx_util import ensure_reference_styles
 from docx import Document
 from docx.oxml import parse_xml
-from docx.shared import Inches, RGBColor
+from docx.shared import Length, Mm, Pt, RGBColor
 from docx.table import _Cell, _Row
 from html4docx import HtmlToDocx  # type: ignore
 from passages.domain.model import (
-    Passage,
     BibleReferenceWithAvailability,
+    Passage,
 )
 from passages.domain.parser import split_chapter_into_verses, verse_text_html
 from passages.domain.stet_verse_list_parser import BOOK_INDEX, parse_bible_blocks
@@ -245,13 +245,21 @@ def generate_docx(
     available_reference_style_name: str = "AvailableReference",
     unavailable_reference_style_name: str = "UnavailableReference",
     unavailable_color: RGBColor = UNAVAILABLE_COLOR,
-    total_width: int = Inches(7.0),
-    document_margin_width: float = Inches(0.75),
+    document_margin_width: Length = Pt(54),
+    a4_width: Length = Mm(210),
+    a4_height: Length = Mm(297),
 ) -> None:
     doc = Document()
     section = doc.sections[0]
-    section.left_margin = Inches(0.75)
-    section.right_margin = Inches(0.75)
+    # Explicitly set A4 paper size and uniform margins
+    section.page_width = a4_width
+    section.page_height = a4_height
+    section.left_margin = document_margin_width
+    section.right_margin = document_margin_width
+    section.top_margin = document_margin_width
+    section.bottom_margin = document_margin_width
+    # Calculate exact printable area dynamically from margins (EMU level precision)
+    printable_width_emu: int = int(a4_width) - (2 * int(document_margin_width))
     ensure_reference_styles(doc, unavailable_color=unavailable_color)
     html_to_docx = HtmlToDocx()
     has_lang1 = lang1_code is not None and lang1_name is not None
@@ -265,16 +273,26 @@ def generate_docx(
         columns.append("lang1")
     if show_notes_column:
         columns.append("notes")
+    # Proportionally split printable width so columns perfectly fill the margin bounds
     if columns == ["lang0"]:
-        col_widths = [total_width]
+        col_widths = [Length(printable_width_emu)]
     elif columns == ["lang0", "lang1"]:
-        col_widths = [Inches(3.5), Inches(3.5)]
+        w = Length(int(printable_width_emu * 0.50))
+        col_widths = [w, w]
     elif columns == ["lang0", "notes"]:
-        col_widths = [Inches(4.5), Inches(2.5)]
+        col_widths = [
+            Length(int(printable_width_emu * 0.65)),
+            Length(int(printable_width_emu * 0.35)),
+        ]
     elif columns == ["lang0", "lang1", "notes"]:
-        col_widths = [Inches(3.0), Inches(3.0), Inches(1.0)]
+        col_widths = [
+            Length(int(printable_width_emu * 0.425)),
+            Length(int(printable_width_emu * 0.425)),
+            Length(int(printable_width_emu * 0.15)),
+        ]
     else:
         logger.warning(f"Unexpected column configuration: {columns}")
+        col_widths = [Length(int(printable_width_emu / len(columns)))] * len(columns)
     table = doc.add_table(rows=0, cols=len(columns))
     table.autofit = False
     table.allow_autofit = False
@@ -288,6 +306,9 @@ def generate_docx(
     )
     for p0, p1 in pairs:
         row = table.add_row()
+        # Apply explicit column widths to cells in each row to prevent Word layout collapse
+        for i, w in enumerate(col_widths):
+            row.cells[i].width = w
         cell = row.cells[col_index["lang0"]]
         run = cell.add_paragraph().add_run(p0.localized_reference)
         run.style = (