feat: éditeur tableur — grille A → Z par blocs, barre de menus Sheets, panneau de couleurs, création .xlsx (#180 → #186)

Restaure et termine le lot tableur resté non committé. Il n'existait que dans un
`git stash` (24 fichiers suivis) et en fichiers non suivis (menus.js, formula.js,
color-picker.js, tests, fiches) : la 2.53.3 livrée ne le contenait donc pas. Le
stash, créé avant le commit BUG-108, n'a jamais été restauré.

#180 Redimensionnement au curseur (en-tête de bord miroité + classe de repaint),
grille thémée sur les 15 thèmes et les modes contraste élevé / sépia, menu
Fichier au niveau des onglets, barre épinglée pleine largeur.

#181 Modèle de saisie Google Sheets : sélection ≠ édition (caret masqué sans
quitter contenteditable, double-clic / F2 / première frappe qui remplace,
Entrée contextuelle, Échap qui restaure) + inventaire priorisé des écarts.

#182 Désélection fiable (clic simple sans dépendre du focus), contours de plage
non empilés (sélecteur de classes sans point), couleurs texte/fond sur une
plage, clic droit qui préserve la sélection multiple.

#183 Panneau de couleurs façon Google Sheets : palette 8 × 10, STANDARD,
PERSONNALISÉ, coche selon la luminance, sortie `#rrggbb` (une valeur HSL était
rejetée par normHex).

#184 Peinture de format complète (toutes propriétés, source sans format =
réinitialisation), sélection multi-lignes/colonnes depuis les marges, grille
étendue : colonnes A → Z d'emblée, lignes ajoutées PAR BLOCS DE 100 au
défilement jusqu'à 1000 — matérialiser 1000 lignes d'un coup = ~26 000 cellules
câblées par feuille, ce qui épuisait le tas de la suite JSDOM ; index de
cellules `ref → td`, court-circuits formule/styles, marqueur data-wired.

#185 Barre de menus : les 10 menus Google Sheets (161 entrées, 125 câblées, 36
annoncées indisponibles), ruban façon Sheets, grille unie 1 px dérivée du thème.

#186 « Créer un fichier » propose .xlsx et construit un vrai classeur OPC
(openpyxl) au lieu d'une charge utile texte illisible.

Corrections trouvées en restaurant et en exerçant le lot :
- fuite mémoire : écouteur `click` anonyme posé sur #content-area à chaque
  rendu, jamais retiré — sa fermeture retenait la grille précédente en entier ;
- sorties Markdown / HTML / Imprimer de la barre de menus inertes
  (`data-xlsx-export` jamais réparti, seul `data-xlsx-action` l'était) ;
- collision de classe `.xlsx-structure-menu` entre la barre de menus et le menu
  Structure de la barre d'outils (toute requête tombait sur un nœud masqué) ;
- curseur col/row-resize absent quand le pointeur est sur la table elle-même ;
- l'export emportait les lignes et colonnes vides du quadrillage (CSV, Markdown,
  HTML, impression) ;
- clic extérieur avalé par la grâce de 250 ms du menu contextuel (destinée au
  seul appui long tactile) ;
- une entrée indisponible laissait la barre de menus ouverte.

Tests : pytest 1595 passés / 2 ignorés ; ruff et mypy 0 erreur ; bandit 0 ;
33 suites frontend vertes (xlsx-viewer 163/163, xlsx-menus 19/19,
xlsx-formula 14/14) ; E2E complet 132 passés / 12 ignorés ; E2E xlsx-viewer
19/19.

backend/routers/files_write.py

@@ -323,9 +323,13 @@ def api_file_xlsx_style(
 
     ``ops`` is an ordered list applied in one locked, atomic rewrite:
     ``cell`` (``sheet``, ``range``/``cell``, ``style`` with ``bold``,
-    ``italic``, ``underline``, ``font_color``/``fill_color`` as ``#rrggbb``,
-    ``align`` and ``number_format``), ``merge``/``unmerge`` (``range``),
-    ``col_width`` (``col``, ``width``), ``row_height`` (``row``, ``height``)
+    ``italic``, ``underline``, ``strike``, ``font_size`` (6-72),
+    ``font_color``/``fill_color`` as ``#rrggbb``, ``align``
+    (left/center/right/justify), ``valign`` (top/middle/bottom), ``wrap``,
+    ``rotation`` (-90..90), ``border`` (all/outer/none) + ``border_style`` /
+    ``border_color`` and ``number_format``), ``merge``/``unmerge`` (``range``),
+    ``col_width`` (``col``, ``width``), ``row_height`` (``row``, ``height``),
+    ``comment_set`` (``ref``, ``text``) / ``comment_clear`` (``ref``)
     and ``freeze`` (``cell``, empty to release).
 
     Without ``force`` the call fails **409** ``xlsx_lossy_content`` when the
@@ -548,6 +552,10 @@ async def api_file_create(
 
     Returns:
         FileCreateResponse confirming creation.
+
+    Note:
+        A ``.xlsx`` path creates an empty workbook (one ``Feuille1`` sheet) built
+        with openpyxl: the payload is binary, so ``content`` is ignored (#186).
     """
     if not check_vault_access(vault_name, current_user):
         raise HTTPException(status_code=403, detail=f"Accès refusé à la vault '{vault_name}'")

backend/services/mutations.py

@@ -41,6 +41,28 @@ _EXCALIDRAW_SKELETON = (
     '"appState":{"viewBackgroundColor":"#ffffff"},"files":{}}'
 )
 
+# Title of the single sheet of a workbook created from scratch (#186).
+_XLSX_DEFAULT_SHEET = "Feuille1"
+
+
+def _empty_xlsx_bytes() -> bytes:
+    """Return the bytes of a valid, empty single-sheet workbook.
+
+    An ``.xlsx`` is a ZIP archive (OPC), not a text file: writing ``""`` to it
+    produces a file no reader (and no spreadsheet application) can open. The
+    "Create a file" modal posts an empty text payload, so the archive itself is
+    built here with openpyxl.
+    """
+    import io
+
+    from openpyxl import Workbook
+
+    wb = Workbook()
+    wb.active.title = _XLSX_DEFAULT_SHEET
+    buffer = io.BytesIO()
+    wb.save(buffer)
+    return buffer.getvalue()
+
 
 def _rel(root: Path, path: Path) -> str:
     """Return *path* relative to *root* as a POSIX-style string."""
@@ -98,13 +120,14 @@ def create_file(
     *,
     overwrite: bool = False,
 ) -> dict[str, Any]:
-    """Create a text file in a vault.
+    """Create a file in a vault.
 
     Args:
         vault_name: Name of the vault.
         path: Vault-relative path of the new file.
         content: Initial content (an Excalidraw skeleton is injected for empty
-            ``.excalidraw`` files).
+            ``.excalidraw`` files). ``.xlsx`` is binary: the workbook is always
+            built from scratch and *content* is ignored for that extension.
         overwrite: When True, replace an existing file (with a backup) instead
             of raising ``already_exists``.
 
@@ -130,17 +153,25 @@ def create_file(
             )
         create_backup(file_path, vault_name, _rel(root, file_path))
 
+    suffix = file_path.suffix.lower()
     try:
         file_path.parent.mkdir(parents=True, exist_ok=True)
-        if file_path.suffix.lower() == ".excalidraw" and not content.strip():
-            content = _EXCALIDRAW_SKELETON
-        file_path.write_text(content, encoding="utf-8")
+        if suffix == ".xlsx":
+            # Binary OPC archive: a text write would leave an unopenable file
+            # (#186). Written as bytes, so the size below is the byte count.
+            payload = _empty_xlsx_bytes()
+            file_path.write_bytes(payload)
+        else:
+            if suffix == ".excalidraw" and not content.strip():
+                content = _EXCALIDRAW_SKELETON
+            payload = content.encode("utf-8")
+            file_path.write_text(content, encoding="utf-8")
     except PermissionError as e:
         raise ServiceError("Permission denied: cannot create file", code="permission_denied", status=403) from e
 
     rel_path = _rel(root, file_path)
     logger.info(f"File created: {vault_name}/{rel_path}")
-    return {"success": True, "vault": vault_name, "path": rel_path, "size": len(content)}
+    return {"success": True, "vault": vault_name, "path": rel_path, "size": len(payload)}
 
 
 def create_directory(vault_name: str, path: str, *, exist_ok: bool = False) -> dict[str, Any]:
@@ -673,11 +704,42 @@ def mutate_xlsx_structure(
                                 "Position 'at' / 'count' invalides", code="invalid", status=400
                             )
                         if op == "row_insert":
-                            ws.insert_rows(at, count)
+                            # Le modèle sparse d'openpyxl ignore les inserts
+                            # au-delà de la dernière ligne utilisée (rien à
+                            # décaler), et l'écrivain abandonne les cellules
+                            # vides (None) au cycle suivant : on matérialise
+                            # avec " " (un blanc qui persiste, relu tel quel,
+                            # affiché vide, ignoré par la recherche) pour
+                            # qu'une insertion « sous la dernière ligne »
+                            # crée bien des lignes blanches, comme Excel.
+                            if at > ws.max_row:
+                                if at - ws.max_row > _INSERT_GAP_LIMIT:
+                                    raise ServiceError(
+                                        "Position trop éloignée de la fin de la feuille",
+                                        code="invalid", status=400,
+                                    )
+                                for r in range(at, at + count):
+                                    cell = ws.cell(row=r, column=1)
+                                    if cell.value is None:
+                                        cell.value = " "
+                            else:
+                                ws.insert_rows(at, count)
                         elif op == "row_delete":
                             ws.delete_rows(at, count)
                         elif op == "col_insert":
-                            ws.insert_cols(at, count)
+                            # Idem côté colonnes : « à droite de la dernière ».
+                            if at > ws.max_column:
+                                if at - ws.max_column > _INSERT_GAP_LIMIT:
+                                    raise ServiceError(
+                                        "Position trop éloignée de la fin de la feuille",
+                                        code="invalid", status=400,
+                                    )
+                                for c in range(at, at + count):
+                                    cell = ws.cell(row=1, column=c)
+                                    if cell.value is None:
+                                        cell.value = " "
+                            else:
+                                ws.insert_cols(at, count)
                         else:
                             ws.delete_cols(at, count)
                         applied.append(f"{op}:{sheet}@{at}x{count}")
@@ -725,16 +787,34 @@ def mutate_xlsx_structure(
 # #156-A8 — write-side formatting. Every value is data-driven (the colours
 # come from the caller, never from a hardcoded palette) and the whole batch
 # rides the same lock, backup and atomic swap as the cell edits.
+# Cap anti-DoS : une insertion au-delà de la fin matérialise des cellules,
+# jamais un gouffre de lignes/colonnes.
+_INSERT_GAP_LIMIT = 1000
 _STYLE_KEYS = {
     "bold",
     "italic",
     "underline",
+    "strike",
+    "font_size",
     "font_color",
     "fill_color",
     "align",
+    "valign",
+    "wrap",
+    "rotation",
+    "border",
+    "border_style",
+    "border_color",
     "number_format",
 }
-_STYLE_ALIGNS = {"left", "center", "right"}
+_STYLE_ALIGNS = {"left", "center", "right", "justify"}
+_STYLE_VALIGNS = {"top": "top", "middle": "center", "bottom": "bottom"}
+_STYLE_BORDERS = {"all", "outer", "none"}
+_STYLE_BORDER_STYLES = {
+    "thin", "medium", "thick", "dashed", "dotted", "double", "hair",
+    "mediumDashed", "dashDot", "mediumDashDot", "dashDotDot",
+    "mediumDashDotDot", "slantDashDot",
+}
 MAX_STYLE_CELLS = 10_000
 _HEX_COLOR_RE = re.compile(r"^#?[0-9a-fA-F]{6}$")
 
@@ -760,14 +840,14 @@ def _apply_cell_style(cell: Any, style: dict[str, Any]) -> None:
     """
     import copy as copy_mod
 
-    from openpyxl.styles import Alignment, Color, PatternFill
+    from openpyxl.styles import Alignment, Border, Color, PatternFill, Side
 
     unknown = set(style) - _STYLE_KEYS
     if unknown:
         raise ServiceError(
             f"Style inconnu: {sorted(unknown)}", code="invalid", status=400
         )
-    if {"bold", "italic", "underline", "font_color"} & set(style):
+    if {"bold", "italic", "underline", "strike", "font_size", "font_color"} & set(style):
         font = copy_mod.copy(cell.font)
         if "bold" in style:
             font.bold = bool(style["bold"])
@@ -775,6 +855,22 @@ def _apply_cell_style(cell: Any, style: dict[str, Any]) -> None:
             font.italic = bool(style["italic"])
         if "underline" in style:
             font.underline = "single" if style["underline"] else None
+        if "strike" in style:
+            font.strike = bool(style["strike"])
+        if "font_size" in style:
+            try:
+                size = float(style["font_size"])
+            except (TypeError, ValueError):
+                raise ServiceError(
+                    f"Taille de police invalide: {style['font_size']!r}",
+                    code="invalid", status=400,
+                ) from None
+            if not 6 <= size <= 72:
+                raise ServiceError(
+                    f"Taille de police hors bornes (6-72): {style['font_size']!r}",
+                    code="invalid", status=400,
+                )
+            font.size = size
         if "font_color" in style:
             rgb = _style_color(style["font_color"])
             font.color = Color(rgb=rgb) if rgb else None
@@ -797,7 +893,69 @@ def _apply_cell_style(cell: Any, style: dict[str, Any]) -> None:
             horizontal=align,
             vertical=getattr(current, "vertical", None),
             wrap_text=getattr(current, "wrap_text", None),
+            text_rotation=getattr(current, "text_rotation", None),
         )
+    if "valign" in style or "wrap" in style or "rotation" in style:
+        current = cell.alignment
+        vertical = getattr(current, "vertical", None)
+        wrap_text = getattr(current, "wrap_text", None)
+        text_rotation = getattr(current, "text_rotation", None) or 0
+        if "valign" in style:
+            valign = style["valign"]
+            if valign not in _STYLE_VALIGNS:
+                raise ServiceError(
+                    f"Alignement vertical invalide: {valign!r}", code="invalid", status=400
+                )
+            vertical = _STYLE_VALIGNS[valign]
+        if "wrap" in style:
+            wrap_text = bool(style["wrap"])
+        if "rotation" in style:
+            try:
+                rotation = int(style["rotation"])
+            except (TypeError, ValueError):
+                raise ServiceError(
+                    f"Rotation invalide: {style['rotation']!r}", code="invalid", status=400
+                ) from None
+            if not (-90 <= rotation <= 90 or rotation == 180):
+                raise ServiceError(
+                    f"Rotation hors bornes (-90..90, 180): {rotation!r}", code="invalid", status=400
+                )
+            # OOXML stocke les angles horaires sur 91..180 (-45° → 135).
+            # 180 = texte vertical retourné (le lecteur le relit tel quel).
+            text_rotation = rotation if rotation >= 0 else 180 + rotation
+        cell.alignment = Alignment(
+            horizontal=getattr(current, "horizontal", None),
+            vertical=vertical,
+            wrap_text=wrap_text,
+            text_rotation=text_rotation,
+        )
+    if {"border", "border_style", "border_color"} & set(style):
+        which = style.get("border", "all")
+        if which not in _STYLE_BORDERS:
+            raise ServiceError(
+                f"Bordure invalide: {which!r}", code="invalid", status=400
+            )
+        bstyle = style.get("border_style", "thin")
+        if bstyle not in _STYLE_BORDER_STYLES:
+            raise ServiceError(
+                f"Style de bordure invalide: {bstyle!r}", code="invalid", status=400
+            )
+        raw_color = style.get("border_color", "#000000")
+        if raw_color in (None, ""):
+            raw_color = "FF000000"
+        rgb = _style_color(raw_color)
+        if rgb is None:
+            raise ServiceError(
+                f"Couleur de bordure invalide: {style.get('border_color')!r}",
+                code="invalid", status=400,
+            )
+        if which == "none":
+            cell.border = Border()
+        else:
+            # `all` et `outer` se rendent pareil cellule par cellule : les
+            # bords partagés coïncident, le contour de la plage reste net.
+            side = Side(style=bstyle, color=rgb)
+            cell.border = Border(left=side, right=side, top=side, bottom=side)
     if "number_format" in style:
         fmt = style["number_format"] or "General"
         if not isinstance(fmt, str) or len(fmt) > 120:
@@ -821,12 +979,17 @@ def mutate_xlsx_style(
     ``ops`` is an ordered list (1 to 50) applied in one locked, atomic rewrite:
 
     * ``{"op": "cell", "sheet": "X", "range": "A1:B2", "style": {…}}`` with
-      ``bold``, ``italic``, ``underline``, ``font_color`` / ``fill_color``
-      (``#rrggbb``, ``""`` clears), ``align`` (left/center/right) and
+      ``bold``, ``italic``, ``underline``, ``strike``, ``font_size`` (6-72),
+      ``font_color`` / ``fill_color`` (``#rrggbb``, ``""`` clears),
+      ``align`` (left/center/right/justify), ``valign`` (top/middle/bottom),
+      ``wrap`` (bool), ``rotation`` (-90..90), ``border``
+      (all/outer/none) + ``border_style`` / ``border_color`` and
       ``number_format`` ;
     * ``{"op": "merge"|"unmerge", "sheet": "X", "range": "A1:B2"}`` ;
     * ``{"op": "col_width", "sheet": "X", "col": "A", "width": 24}`` ;
     * ``{"op": "row_height", "sheet": "X", "row": 3, "height": 30}`` ;
+    * ``{"op": "comment_set", "sheet": "X", "ref": "B2", "text": "…"}``
+      (``author`` optional) / ``{"op": "comment_clear", ...}`` ;
     * ``{"op": "freeze", "sheet": "X", "cell": "B2"}`` (``""`` releases).
 
     Same guards as the cell edits: per-file lock, ``.bak`` backup,
@@ -960,7 +1123,17 @@ def mutate_xlsx_style(
                             raise ServiceError(
                                 "Largeur invalide (0 à 255)", code="invalid", status=400
                             )
-                        ws.column_dimensions[col.strip().upper()].width = float(width)
+                        width = float(width)
+                        if width == 0:
+                            # 0 = largeur par défaut (équivalent « Default
+                            # Width » d'Excel / « Reset » de Sheets) : on
+                            # retire la mesure explicite au lieu d'écrire une
+                            # largeur de 0, qu'Excel lirait comme une colonne
+                            # quasi masquée pendant que l'affichage reste en
+                            # largeur automatique.
+                            ws.column_dimensions.pop(col.strip().upper(), None)
+                        else:
+                            ws.column_dimensions[col.strip().upper()].width = width
                         applied.append(f"col_width:{ws.title}!{col}={width}")
                     elif op == "row_height":
                         ws = _sheet(wb, action)
@@ -972,7 +1145,14 @@ def mutate_xlsx_style(
                             raise ServiceError(
                                 "Hauteur invalide (0 à 409)", code="invalid", status=400
                             )
-                        ws.row_dimensions[row].height = float(height)
+                        height = float(height)
+                        if height == 0:
+                            # 0 = hauteur par défaut (même logique que la
+                            # largeur ci-dessus) : la mesure explicite est
+                            # retirée, la ligne redevient automatique.
+                            ws.row_dimensions.pop(row, None)
+                        else:
+                            ws.row_dimensions[row].height = height
                         applied.append(f"row_height:{ws.title}!{row}={height}")
                     elif op == "freeze":
                         ws = _sheet(wb, action)
@@ -981,6 +1161,31 @@ def mutate_xlsx_style(
                             _range(cell_ref)
                         ws.freeze_panes = cell_ref.upper() or None
                         applied.append(f"freeze:{ws.title}!{cell_ref or '-'}")
+                    elif op in ("comment_set", "comment_clear"):
+                        from openpyxl.comments import Comment
+
+                        ws = _sheet(wb, action)
+                        ref = str(action.get("ref") or action.get("cell") or "")
+                        min_col, min_row, max_col, max_row = _range(ref)
+                        if (min_col, min_row) != (max_col, max_row):
+                            raise ServiceError(
+                                "Un commentaire vise une cellule (A1), pas une plage",
+                                code="invalid", status=400,
+                            )
+                        if op == "comment_clear":
+                            ws.cell(row=min_row, column=min_col).comment = None
+                        else:
+                            text = str(action.get("text") or "")
+                            if not text.strip() or len(text) > 2000:
+                                raise ServiceError(
+                                    "Texte de commentaire invalide (1 à 2000 caractères)",
+                                    code="invalid", status=400,
+                                )
+                            author = str(action.get("author") or "ObsiGate")[:64]
+                            ws.cell(row=min_row, column=min_col).comment = Comment(
+                                text, author
+                            )
+                        applied.append(f"{op}:{ws.title}!{ref}")
                     else:
                         raise ServiceError(
                             f"Action inconnue: {op!r}", code="invalid", status=400

backend/xlsx_reader.py

@@ -129,8 +129,16 @@ def _cell_fragments(cell: Any) -> tuple[list[str], str | None]:
         fragments.append("font-style:italic")
     # #156-A8 — underline is written from the viewer too, so it is read back
     # (the toggle in the formatting menu needs to see its own effect).
+    decorations = []
     if font and font.underline:
-        fragments.append("text-decoration:underline")
+        decorations.append("underline")
+    if font and getattr(font, "strike", False):
+        decorations.append("line-through")
+    if decorations:
+        fragments.append("text-decoration:" + " ".join(decorations))
+    size = getattr(font, "size", None) if font else None
+    if isinstance(size, (int, float)) and size != 11:
+        fragments.append(f"font-size:{size:g}pt")
     fmt = cell.number_format
     if fmt and fmt not in ("General", "@"):
         # A custom number format is signalled typographically (mono font)
@@ -140,29 +148,129 @@ def _cell_fragments(cell: Any) -> tuple[list[str], str | None]:
         fragments.append("font-family:'JetBrains Mono',monospace")
     alignment = cell.alignment
     align = alignment.horizontal if alignment else None
-    return fragments, (align if align in ("left", "right", "center") else None)
+    if alignment is not None:
+        vertical = getattr(alignment, "vertical", None)
+        if vertical == "center":
+            fragments.append("vertical-align:middle")
+        elif vertical in ("top", "bottom"):
+            fragments.append(f"vertical-align:{vertical}")
+        if getattr(alignment, "wrap_text", None) is True:
+            fragments.append("white-space:normal")
+        elif getattr(alignment, "wrap_text", None) is False:
+            fragments.append("white-space:nowrap")
+        rotation = getattr(alignment, "text_rotation", None) or 0
+        if rotation == 90 or rotation == 255:
+            fragments.append("writing-mode:vertical-rl")
+        elif rotation == 180:
+            fragments.append("writing-mode:vertical-rl;transform:scale(-1)")
+        else:
+            # Angles diagonaux (ex. ±45° du menu Format › Rotation) : OOXML
+            # stocke l'anti-horaire sur 0..90 et l'horaire sur 91..180 (-45°
+            # → 135, cf. mutations). Le CSS tourne en sens horaire : signe
+            # inversé pour un rendu fidèle.
+            excel = rotation if rotation <= 90 else -(180 - rotation)
+            if excel:
+                fragments.append(f"transform:rotate({-excel}deg)")
+    border = getattr(cell, "border", None)
+    if border is not None:
+        sides = []
+        for side_name in ("left", "right", "top", "bottom"):
+            side = getattr(border, side_name, None)
+            style = getattr(side, "style", None)
+            if not style:
+                continue
+            color = getattr(getattr(side, "color", None), "rgb", None)
+            hexpart = ""
+            if isinstance(color, str) and len(color) == 8:
+                hexpart = f" #{color[2:].lower()}"
+            width = {"medium": "2px", "thick": "3px"}.get(style, "1px")
+            css_style = {"dashed": "dashed", "dotted": "dotted", "double": "double"}.get(
+                style, "solid"
+            )
+            sides.append(f"border-{side_name}:{width} {css_style}{hexpart}")
+        fragments.extend(sides)
+    return fragments, (align if align in ("left", "right", "center", "justify") else None)
 
 
-def _sheet_style_maps(ws: Any) -> tuple[dict[str, str], dict[str, str]]:
-    """Flat ``{ref: css}`` and ``{ref: align}`` maps of one worksheet.
+def _sheet_style_maps(
+    ws: Any,
+) -> tuple[dict[str, str], dict[str, str], dict[str, str], dict[str, str]]:
+    """Flat maps of one worksheet: css, align, comment text, number format.
 
     The flat string is what the API serves and what the viewer applies
     verbatim to ``td.style``; a plain cell is simply absent from the map.
     ``left`` is the table default and never included. Bounded by
-    ``MAX_ROWS x MAX_COLS`` like the render itself.
+    ``MAX_ROWS x MAX_COLS`` like the render itself. Comment texts are capped
+    (tooltip use) and formats only list non-General number formats.
     """
     styles: dict[str, str] = {}
     aligns: dict[str, str] = {}
+    comments: dict[str, str] = {}
+    formats: dict[str, str] = {}
     for row in ws.iter_rows(min_row=1, max_row=MAX_ROWS, max_col=MAX_COLS):
         for cell in row:
-            if cell.value is None and cell.number_format == "General":
+            comment = getattr(cell, "comment", None)
+            comment_text = getattr(comment, "text", None) if comment is not None else None
+            # Une cellule vide mais stylée (gras, diagonale, commentaire…)
+            # doit survivre à la relecture : `has_style` (et le commentaire)
+            # sont les seuls tests rapides qui la distinguent d'une cellule
+            # vraiment vierge — sinon le style semble « ne pas fonctionner »
+            # dès qu'on recharge le classeur.
+            if cell.value is None and cell.number_format == "General" and not cell.has_style:
+                if comment_text:
+                    comments[cell.coordinate] = str(comment_text)[:500]
                 continue
             fragments, align = _cell_fragments(cell)
             if fragments:
                 styles[cell.coordinate] = ";".join(fragments)
             if align and align != "left":
                 aligns[cell.coordinate] = align
-    return styles, aligns
+            if comment_text:
+                comments[cell.coordinate] = str(comment_text)[:500]
+            fmt = getattr(cell, "number_format", None)
+            if fmt and fmt not in ("General", "@", None):
+                formats[cell.coordinate] = str(fmt)
+    return styles, aligns, comments, formats
+
+
+def _sheet_dim_maps(ws: Any) -> tuple[dict[str, float], dict[str, float]]:
+    """Explicit column widths (units) and row heights (pt), by letter/number.
+
+    Only dimensions the file sets explicitly are listed (defaults are a
+    rendering concern of the client). Bounded like the render itself.
+    """
+    from openpyxl.utils import column_index_from_string
+
+    colwidths: dict[str, float] = {}
+    try:
+        for key, dim in (getattr(ws, "column_dimensions", {}) or {}).items():
+            width = getattr(dim, "width", None)
+            if not isinstance(width, (int, float)):
+                continue
+            letters = str(key).split(":")
+            try:
+                cols = [column_index_from_string(a.strip()) for a in letters]
+            except ValueError:
+                continue
+            lo, hi = min(cols), max(cols)
+            for c in range(lo, min(hi, MAX_COLS) + 1):
+                if c >= 1:
+                    from openpyxl.utils import get_column_letter
+
+                    colwidths[get_column_letter(c)] = float(width)
+    except Exception:
+        logger.debug("xlsx column widths unavailable", exc_info=True)
+    rowheights: dict[str, float] = {}
+    try:
+        for r, dim in (getattr(ws, "row_dimensions", {}) or {}).items():
+            if not isinstance(r, int) or not 1 <= r <= MAX_ROWS:
+                continue
+            height = getattr(dim, "height", None)
+            if isinstance(height, (int, float)):
+                rowheights[str(r)] = float(height)
+    except Exception:
+        logger.debug("xlsx row heights unavailable", exc_info=True)
+    return colwidths, rowheights
 
 
 def read_sheet_styles(file_path: Path, sheet: str) -> dict[str, dict[str, Any]]:
@@ -445,7 +553,8 @@ def invalidate_workbook_meta(file_path: Path | str) -> None:
 
 
 def read_workbook_meta(file_path: Path) -> dict[str, dict[str, Any]]:
-    """Return ``{sheet: {styles, aligns, merges, freeze}}`` for every sheet.
+    """Return ``{sheet: {styles, aligns, comments, formats, colwidths,
+    rowheights, merges, freeze}}``.
 
     One normal (non-streaming) load serves the three A15 metadata maps: the
     fragments are the workbook's own values, a failure yields ``{}`` per sheet
@@ -483,12 +592,17 @@ def _read_workbook_meta_uncached(file_path: Path) -> dict[str, dict[str, Any]]:
     out: dict[str, dict[str, Any]] = {}
     try:
         for ws in wb.worksheets:
-            styles, aligns = _sheet_style_maps(ws)
+            styles, aligns, comments, formats = _sheet_style_maps(ws)
+            colwidths, rowheights = _sheet_dim_maps(ws)
             merged = getattr(ws, "merged_cells", None)
             ranges = getattr(merged, "ranges", None) or []
             out[ws.title] = {
                 "styles": styles,
                 "aligns": aligns,
+                "comments": comments,
+                "formats": formats,
+                "colwidths": colwidths,
+                "rowheights": rowheights,
                 "merges": [str(r) for r in ranges],
                 "freeze": str(getattr(ws, "freeze_panes", None) or ""),
             }
@@ -496,7 +610,14 @@ def _read_workbook_meta_uncached(file_path: Path) -> dict[str, dict[str, Any]]:
     except Exception:
         logger.debug("xlsx meta unavailable", exc_info=True)
         for t in wb.sheetnames:
-            out.setdefault(t, {"styles": {}, "aligns": {}, "merges": [], "freeze": ""})
+            out.setdefault(
+                t,
+                {
+                    "styles": {}, "aligns": {}, "comments": {}, "formats": {},
+                    "colwidths": {}, "rowheights": {},
+                    "merges": [], "freeze": "",
+                },
+            )
         return out
     finally:
         wb.close()
@@ -565,6 +686,10 @@ def render_sheets(file_path: Path) -> list[dict[str, Any]]:
                 "truncated": total_rows > MAX_ROWS or total_cols > MAX_COLS,
                 "styles": sheet_meta.get("styles", {}),
                 "aligns": sheet_meta.get("aligns", {}),
+                "comments": sheet_meta.get("comments", {}),
+                "formats": sheet_meta.get("formats", {}),
+                "colwidths": sheet_meta.get("colwidths", {}),
+                "rowheights": sheet_meta.get("rowheights", {}),
                 "merges": sheet_meta.get("merges", []),
                 "freeze": sheet_meta.get("freeze", ""),
             }
@@ -629,6 +754,10 @@ def read_sheet_window(
         "html": _table(grid, shadow, row_offset=offset, styles=meta.get("styles")),
         "styles": meta.get("styles", {}),
         "aligns": meta.get("aligns", {}),
+        "comments": meta.get("comments", {}),
+        "formats": meta.get("formats", {}),
+        "colwidths": meta.get("colwidths", {}),
+        "rowheights": meta.get("rowheights", {}),
         "merges": meta.get("merges", []),
         "freeze": meta.get("freeze", ""),
     }