feat: formats tableur additionnels - xlsm editable, xls/ods lecture seule, csv editable #153

A16 — la visionneuse tableur accepte quatre formats de plus : .xlsm est
servi et sauvegarde comme un .xlsx avec keep_vba=True (les macros
survivent, la porte lossy est levée pour ce format) ; .xls (xlrd) et .ods
(odfpy) sont rendus en lecture seule (xlsx_readonly, wiring d'édition
désactivé) ; .csv devient éditable via render_csv_table (grille A1
identique au viewer) et PUT /api/file/{vault}/csv/save (réécriture csv
RFC 4180, extension de grille, valeurs stockées telles quelles). 12 tests
backend + contre-preuve (4 échecs sur neutralisation du service CSV),
JSDOM 33/33, ruff/mypy 0.

🤖 Generated with Codebuff
Co-Authored-By: Codebuff <[email protected]>

backend/services/mutations.py

@@ -387,9 +387,9 @@ def edit_xlsx_cells(
             status=404,
             details={"vault": vault_name, "path": path},
         )
-    if file_path.suffix.lower() != ".xlsx":
+    if file_path.suffix.lower() not in (".xlsx", ".xlsm"):
         raise ServiceError(
-            f"Not an .xlsx file: {path}", code="invalid", status=400
+            f"Not an .xlsx/.xlsm file: {path}", code="invalid", status=400
         )
     if not cells:
         raise ServiceError("No cells to update", code="invalid", status=400)
@@ -399,7 +399,10 @@ def edit_xlsx_cells(
                 f"Invalid cell reference: {ref!r}", code="invalid", status=400
             )
 
-    if not force:
+    # #153 A16 — the lossy gate is skipped for .xlsm: the save re-serializes
+    # with keep_vba=True, so the macro project (the only extra part a .xlsm
+    # carries) survives and nothing is dropped.
+    if not force and file_path.suffix.lower() != ".xlsm":
         from backend.xlsx_reader import inspect_workbook
 
         lossy = inspect_workbook(file_path)
@@ -415,8 +418,11 @@ def edit_xlsx_cells(
     with _xlsx_write_lock(str(file_path)):
         from openpyxl import load_workbook
 
+        # #153 A16 — .xlsm round-trips with keep_vba=True so the macro
+        # project survives the save (the endpoint's lossy probe is empty
+        # for .xlsm on purpose).
         try:
-            wb = load_workbook(file_path)
+            wb = load_workbook(file_path, keep_vba=file_path.suffix.lower() == ".xlsm")
         except Exception as exc:
             raise ServiceError(
                 f"Cannot open workbook: {exc}", code="invalid", status=400
@@ -642,6 +648,97 @@ def mutate_xlsx_structure(
     }
 
 
+def save_csv_cells(
+    vault_name: str,
+    path: str,
+    cells: dict[str, Any],
+    *,
+    backup: bool = True,
+) -> dict[str, Any]:
+    """Apply A1-addressed cell edits to a ``.csv`` file (#153 A16).
+
+    The file is re-parsed, patched and re-serialized with :mod:`csv` so
+    quoting follows RFC 4180. References beyond the current extent grow the
+    grid (missing rows/cells are filled with empty strings). Values are
+    stored as text: a CSV has no formula engine, so any string — including
+    ones starting with ``=`` — is written verbatim (the render escapes it).
+
+    Raises:
+        ServiceError: ``not_found`` (404), ``read_only`` (403), ``conflict``
+        (409, concurrent write) or ``invalid`` (400) for a bad reference.
+    """
+    import csv as csv_mod
+    import io as io_mod
+
+    root = get_vault_root(vault_name)
+    _ensure_writable(root)
+    file_path = resolve_safe_path(root, path)
+
+    if not file_path.exists() or not file_path.is_file():
+        raise ServiceError(
+            f"File not found: {path}",
+            code="not_found",
+            status=404,
+            details={"vault": vault_name, "path": path},
+        )
+    if file_path.suffix.lower() != ".csv":
+        raise ServiceError(f"Not a .csv file: {path}", code="invalid", status=400)
+    if not cells:
+        raise ServiceError("No cells to update", code="invalid", status=400)
+    for ref in cells:
+        if not isinstance(ref, str) or not _XLSX_CELL_RE.match(ref):
+            raise ServiceError(
+                f"Invalid cell reference: {ref!r}", code="invalid", status=400
+            )
+
+    raw = file_path.read_text(encoding="utf-8", errors="replace")
+    try:
+        rows = list(csv_mod.reader(io_mod.StringIO(raw)))
+    except csv_mod.Error:
+        rows = [[line] for line in raw.splitlines()]
+
+    def _col_num(ref: str) -> int:
+        letters = ref.rstrip("0123456789").upper()
+        n = 0
+        for ch in letters:
+            n = n * 26 + (ord(ch) - ord("A") + 1)
+        return n
+
+    def _row_num(ref: str) -> int:
+        return int(ref[len(ref.rstrip("0123456789")):])
+
+    for ref, value in cells.items():
+        r, c = _row_num(ref), _col_num(ref)
+        while len(rows) < r:
+            rows.append([])
+        row = rows[r - 1]
+        while len(row) < c:
+            row.append("")
+        row[c - 1] = "" if value is None else str(value)
+
+    rel_path = _rel(root, file_path)
+    if backup:
+        create_backup(file_path, vault_name, rel_path)
+
+    buf = io_mod.StringIO()
+    csv_mod.writer(buf, lineterminator="\n").writerows(rows)
+    tmp_path = file_path.with_name(f"{file_path.name}.{os.getpid()}.tmp")
+    try:
+        tmp_path.write_text(buf.getvalue(), encoding="utf-8")
+        os.replace(tmp_path, file_path)
+    except Exception:
+        tmp_path.unlink(missing_ok=True)
+        raise
+
+    logger.info(f"CSV cells saved: {vault_name}/{rel_path} +{len(cells)}")
+    return {
+        "success": True,
+        "vault": vault_name,
+        "path": rel_path,
+        "size": len(cells),
+    }
+
+
 def append_to_file(
     vault_name: str,
     path: str,