feat: completude de l'editeur Excel - mise en forme, sortie, concurrence, cache, outils IA #156

L'editeur lisait les styles mais ne les ecrivait pas, exportait la feuille
entiere et laissait le dernier-ecrivain gagner entre processus.

- A8 : bouton Mise en forme (gras/italique/souligne, alignements, couleurs via
  selecteur natif, formats de nombre, fusion, volets figes, largeur/hauteur) et
  nouvelle route PUT .../xlsx/style (verrou, backup, swap atomique, garde de
  perte, If-Match) ; A9 : decision "pas de moteur de formule" annoncee dans
  l'UI ; A10 : undo/redo unifie, piles par fichier conservees au re-rendu
- A11 : export de la selection + Markdown/HTML/impression et recherche sur
  toutes les feuilles ; A12 : concurrence optimiste (If-Match -> 409 reparable,
  retry qui relit) ; A13 : cache des metadonnees par (chemin, mtime, taille)
- A14 : outils IA .xlsm/.csv + search_workbook, analyze_range,
  edit_xlsx_structure
- tests : test_xlsx_styles.py (17), test_spreadsheet_tools.py (34),
  TestOptimisticConcurrency/TestMetaCache, JSDOM xlsx-viewer 107/107

frontend/js/xlsx/command-bar.js

@@ -55,6 +55,9 @@ export function buildCommandBar({ sheets, isCsv, readOnly, editable }) {
   }
   if (editable) {
     actionGroups.push(`<span class="xlsx-cmd-group" data-group="insert">
+            <button class="btn-action" id="xlsx-format-btn" title="${escapeHtml(t("xlsx.format_btn"))}">
+              <i data-lucide="paintbrush" style="width:14px;height:14px"></i>
+            </button>
             <button class="btn-action" id="xlsx-structure-btn" title="${escapeHtml(t("xlsx.structure_btn"))}">
               <i data-lucide="table-properties" style="width:14px;height:14px"></i>
             </button>
@@ -68,6 +71,16 @@ export function buildCommandBar({ sheets, isCsv, readOnly, editable }) {
             <button class="btn-action" id="xlsx-csv-btn" title="${escapeHtml(t("xlsx.csv_export"))}">
               <i data-lucide="file-spreadsheet" style="width:14px;height:14px"></i> CSV
             </button>
+            <span class="export-dropdown xlsx-export-dropdown">
+              <button class="btn-action" id="xlsx-export-btn" type="button" title="${escapeHtml(t("xlsx.export_title"))}">
+                <i data-lucide="file-down" style="width:14px;height:14px"></i> ${escapeHtml(t("xlsx.export_btn"))}
+              </button>
+              <div class="export-menu xlsx-export-menu" id="xlsx-export-menu" style="display:none">
+                <button class="export-menu-item" type="button" data-xlsx-export="md">${escapeHtml(t("xlsx.export_md"))}</button>
+                <button class="export-menu-item" type="button" data-xlsx-export="html">${escapeHtml(t("xlsx.export_html"))}</button>
+                <button class="export-menu-item" type="button" data-xlsx-export="print">${escapeHtml(t("xlsx.print"))}</button>
+              </div>
+            </span>
             <button class="btn-action xlsx-save-primary" id="xlsx-save-btn" disabled>${t("common.save")}</button>
           </span>`);
   const actionsHtml = actionGroups.join('<span class="xlsx-cmd-sep" aria-hidden="true"></span>');

frontend/locales/en.json

@@ -1848,13 +1848,59 @@
   "xlsx.load_error": "Could not load the remaining rows",
   "xlsx.formula_bar_placeholder": "Active cell content",
   "xlsx.active_cell": "Cell",
-  "xlsx.find_placeholder": "Search in the sheet…",
+  "xlsx.name_box_label": "Name Box — jump to a cell or a range",
+  "xlsx.name_box_hint": "Type a reference (B12, A1:B3) then Enter to jump there",
+  "xlsx.name_box_invalid": "Unknown reference: {ref}",
+  "xlsx.copy": "Copy",
+  "xlsx.cut": "Cut",
+  "xlsx.paste": "Paste",
+  "xlsx.paste_empty": "Clipboard empty or unreadable",
+  "xlsx.paste_out_of_grid": "Part of the pasted block is outside the displayed grid and was skipped",
+  "xlsx.fn_suggestions": "SUM;AVERAGE;COUNT;COUNTA;MIN;MAX;IF;VLOOKUP;XLOOKUP;SUMIF;SUMIFS;COUNTIF;CONCAT;LEFT;RIGHT;MID;TODAY;NOW;ROUND;ABS;SQRT",
+  "xlsx.formula_stored_as_text": "{n} value(s) starting with “=” or “@” saved as text — turn on the f(x) button to write real formulas",
+  "xlsx.find_placeholder": "Search in the workbook…",
   "xlsx.find_prev": "Previous",
   "xlsx.find_next": "Next",
   "xlsx.find_case": "Match case",
   "xlsx.find_no_match": "No match",
   "xlsx.find_count": "{index}/{count}",
-  "xlsx.csv_export": "Export the sheet as CSV",
+  "xlsx.find_count_sheets": "{index}/{count} · {sheets} sheets",
+  "xlsx.csv_export": "Export the sheet or the selection as CSV",
+  "xlsx.export_btn": "Export",
+  "xlsx.export_title": "Export the selection or the sheet",
+  "xlsx.export_md": "Export as Markdown",
+  "xlsx.export_html": "Export as HTML",
+  "xlsx.print": "Print",
+  "xlsx.export_scope_sheet": "the sheet",
+  "xlsx.export_scope_selection": "the selection",
+  "xlsx.export_done": "Exported {scope}",
+  "xlsx.format_btn": "Formatting",
+  "xlsx.format_bold": "Bold",
+  "xlsx.format_italic": "Italic",
+  "xlsx.format_underline": "Underline",
+  "xlsx.format_clear": "Clear formatting",
+  "xlsx.format_align_left": "Align left",
+  "xlsx.format_align_center": "Center",
+  "xlsx.format_align_right": "Align right",
+  "xlsx.format_font_color": "Text colour",
+  "xlsx.format_fill_color": "Fill colour",
+  "xlsx.format_num_general": "General format",
+  "xlsx.format_num_number": "Number (2 decimals)",
+  "xlsx.format_num_percent": "Percentage",
+  "xlsx.format_num_currency": "Currency (€)",
+  "xlsx.format_num_date": "Date (DD/MM/YYYY)",
+  "xlsx.format_num_text": "Text",
+  "xlsx.format_merge": "Merge cells",
+  "xlsx.format_unmerge": "Unmerge cells",
+  "xlsx.format_merge_needs_range": "Select at least two cells to merge",
+  "xlsx.format_freeze": "Freeze panes here",
+  "xlsx.format_unfreeze": "Unfreeze panes",
+  "xlsx.format_col_width": "Column width…",
+  "xlsx.format_col_prompt": "Width of column {col} (0 to 255)",
+  "xlsx.format_row_height": "Row height…",
+  "xlsx.format_row_prompt": "Height of row {row} (0 to 409)",
+  "xlsx.format_applied": "Formatting saved",
+  "xlsx.format_error": "Formatting failed",
   "xlsx.sort_asc": "Sort column A→Z",
   "xlsx.sort_desc": "Sort column Z→A",
   "xlsx.sort_applied": "Sort applied on {col} — display only, the workbook is unchanged",
@@ -1905,6 +1951,7 @@
   "xlsx.dashboard_nr_ref": "Reference",
   "xlsx.dashboard_hint": "Select a range or open the AI assistant to analyse this data.",
   "xlsx.feature_cached_values": "cached values",
+  "xlsx.feature_cached_values_unverified": "cached values could not be verified (workbook too large)",
   "xlsx.feature_slicers": "slicers and timelines",
   "xlsx.feature_form_controls": "form controls",
   "xlsx.feature_connections": "connections and queries",
@@ -2080,6 +2127,9 @@
   "ai.step.xlsx_read": "Workbook read: {value}",
   "ai.step.xlsx_update": "Cells edited: {value}",
   "ai.step.xlsx_append": "Rows appended: {value}",
+  "ai.step.xlsx_search": "Workbook searched: {value}",
+  "ai.step.xlsx_analyze": "Range analysed: {value}",
+  "ai.step.xlsx_structure": "Structure changed: {value}",
   "ai.step.docx_create": "Word document proposed: {value}",
   "ai.step.csv_create": "CSV file proposed: {value}",
   "ai.step.pdf_create": "PDF document proposed: {value}",

frontend/locales/fr.json

@@ -1848,13 +1848,59 @@
   "xlsx.load_error": "Chargement de la suite impossible",
   "xlsx.formula_bar_placeholder": "Contenu de la cellule active",
   "xlsx.active_cell": "Cellule",
-  "xlsx.find_placeholder": "Rechercher dans la feuille…",
+  "xlsx.name_box_label": "Zone Nom — atteindre une cellule ou une plage",
+  "xlsx.name_box_hint": "Saisissez une référence (B12, A1:B3) puis Entrée pour y aller",
+  "xlsx.name_box_invalid": "Référence inconnue : {ref}",
+  "xlsx.copy": "Copier",
+  "xlsx.cut": "Couper",
+  "xlsx.paste": "Coller",
+  "xlsx.paste_empty": "Presse-papiers vide ou illisible",
+  "xlsx.paste_out_of_grid": "Une partie du collage dépasse la grille affichée et a été ignorée",
+  "xlsx.fn_suggestions": "SOMME;MOYENNE;NB;NBVAL;MIN;MAX;SI;RECHERCHEV;RECHERCHEX;SOMME.SI;SOMME.SI.ENS;NB.SI;CONCAT;GAUCHE;DROITE;STXT;AUJOURDHUI;MAINTENANT;ARRONDI;ABS;RACINE",
+  "xlsx.formula_stored_as_text": "{n} valeur(s) commençant par « = » ou « @ » enregistrée(s) comme texte — activez le bouton f(x) pour écrire de vraies formules",
+  "xlsx.find_placeholder": "Rechercher dans le classeur…",
   "xlsx.find_prev": "Précédent",
   "xlsx.find_next": "Suivant",
   "xlsx.find_case": "Respecter la casse",
   "xlsx.find_no_match": "Aucune correspondance",
   "xlsx.find_count": "{index}/{count}",
-  "xlsx.csv_export": "Exporter la feuille en CSV",
+  "xlsx.find_count_sheets": "{index}/{count} · {sheets} feuilles",
+  "xlsx.csv_export": "Exporter la feuille ou la sélection en CSV",
+  "xlsx.export_btn": "Exporter",
+  "xlsx.export_title": "Exporter la sélection ou la feuille",
+  "xlsx.export_md": "Exporter en Markdown",
+  "xlsx.export_html": "Exporter en HTML",
+  "xlsx.print": "Imprimer",
+  "xlsx.export_scope_sheet": "la feuille",
+  "xlsx.export_scope_selection": "la sélection",
+  "xlsx.export_done": "Export de {scope} terminé",
+  "xlsx.format_btn": "Mise en forme",
+  "xlsx.format_bold": "Gras",
+  "xlsx.format_italic": "Italique",
+  "xlsx.format_underline": "Souligné",
+  "xlsx.format_clear": "Effacer la mise en forme",
+  "xlsx.format_align_left": "Aligner à gauche",
+  "xlsx.format_align_center": "Centrer",
+  "xlsx.format_align_right": "Aligner à droite",
+  "xlsx.format_font_color": "Couleur du texte",
+  "xlsx.format_fill_color": "Couleur de fond",
+  "xlsx.format_num_general": "Format général",
+  "xlsx.format_num_number": "Nombre (2 décimales)",
+  "xlsx.format_num_percent": "Pourcentage",
+  "xlsx.format_num_currency": "Monétaire (€)",
+  "xlsx.format_num_date": "Date (JJ/MM/AAAA)",
+  "xlsx.format_num_text": "Texte",
+  "xlsx.format_merge": "Fusionner les cellules",
+  "xlsx.format_unmerge": "Annuler la fusion",
+  "xlsx.format_merge_needs_range": "Sélectionnez au moins deux cellules pour fusionner",
+  "xlsx.format_freeze": "Figer les volets ici",
+  "xlsx.format_unfreeze": "Libérer les volets",
+  "xlsx.format_col_width": "Largeur de colonne…",
+  "xlsx.format_col_prompt": "Largeur de la colonne {col} (0 à 255)",
+  "xlsx.format_row_height": "Hauteur de ligne…",
+  "xlsx.format_row_prompt": "Hauteur de la ligne {row} (0 à 409)",
+  "xlsx.format_applied": "Mise en forme enregistrée",
+  "xlsx.format_error": "Échec de la mise en forme",
   "xlsx.sort_asc": "Trier la colonne A→Z",
   "xlsx.sort_desc": "Trier la colonne Z→A",
   "xlsx.sort_applied": "Tri appliqué sur {col} — l'affichage seul, le classeur n'est pas modifié",
@@ -1905,6 +1951,7 @@
   "xlsx.dashboard_nr_ref": "Référence",
   "xlsx.dashboard_hint": "Sélectionnez une plage ou ouvrez l'assistant IA pour analyser ces données.",
   "xlsx.feature_cached_values": "valeurs calculées",
+  "xlsx.feature_cached_values_unverified": "valeurs calculées non vérifiables (classeur trop volumineux)",
   "xlsx.feature_slicers": "segments et chronologies",
   "xlsx.feature_form_controls": "contrôles de formulaire",
   "xlsx.feature_connections": "connexions et requêtes",
@@ -2080,6 +2127,9 @@
   "ai.step.xlsx_read": "Classeur lu : {value}",
   "ai.step.xlsx_update": "Cellules modifiées : {value}",
   "ai.step.xlsx_append": "Lignes ajoutées : {value}",
+  "ai.step.xlsx_search": "Recherche dans le classeur : {value}",
+  "ai.step.xlsx_analyze": "Plage analysée : {value}",
+  "ai.step.xlsx_structure": "Structure modifiée : {value}",
   "ai.step.docx_create": "Document Word proposé : {value}",
   "ai.step.csv_create": "Fichier CSV proposé : {value}",
   "ai.step.pdf_create": "Document PDF proposé : {value}",

frontend/style.css

@@ -11172,8 +11172,11 @@ body.desktop-mode .editor-container {
   gap: 6px;
   margin-bottom: 8px;
 }
+/* #156-A7 — the Name Box is editable (“Atteindre”): a plain input styled like
+   the read-only badge it replaced. */
 .xlsx-active-cell {
-  min-width: 52px;
+  width: 84px;
+  box-sizing: border-box;
   padding: 4px 8px;
   border: 1px solid var(--border);
   border-radius: 4px;
@@ -11184,6 +11187,10 @@ body.desktop-mode .editor-container {
   text-align: center;
   font-variant-numeric: tabular-nums;
 }
+.xlsx-active-cell:focus {
+  outline: 2px solid var(--accent, #4a90d9);
+  outline-offset: -2px;
+}
 .xlsx-formula-sep {
   width: 14px;
   height: 14px;
@@ -11253,6 +11260,72 @@ body.desktop-mode .editor-container {
   outline-offset: 1px;
 }
 
+/* #156-A11 — export menu (CSV stays a button; MD/HTML/Print live here). */
+.xlsx-export-dropdown {
+  position: relative;
+  display: inline-block;
+}
+.xlsx-export-menu {
+  position: absolute;
+  right: 0;
+  top: 100%;
+  z-index: 1000;
+  min-width: 200px;
+  padding: 4px;
+  background: var(--bg, #fff);
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.18);
+}
+.xlsx-export-menu .export-menu-item {
+  display: block;
+  width: 100%;
+  padding: 8px 10px;
+  border: none;
+  border-radius: 4px;
+  background: none;
+  color: var(--text-primary);
+  cursor: pointer;
+  text-align: left;
+  font-size: 13px;
+}
+.xlsx-export-menu .export-menu-item:hover {
+  background: var(--surface-hover, rgba(127, 127, 127, 0.12));
+}
+.xlsx-print-frame {
+  position: fixed;
+  width: 0;
+  height: 0;
+  border: 0;
+}
+
+/* #156-A8 — formatting menu: the colour rows pair a label with the native
+   picker (data-driven colours, no hardcoded swatch). */
+.xlsx-format-menu {
+  min-width: 230px;
+  max-height: 70vh;
+  overflow-y: auto;
+}
+.xlsx-format-colour {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 8px;
+  padding: 6px 10px;
+  color: var(--text-primary);
+  font-size: 13px;
+  cursor: pointer;
+}
+.xlsx-format-colour input[type="color"] {
+  width: 34px;
+  height: 22px;
+  padding: 0;
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  background: var(--surface);
+  cursor: pointer;
+}
+
 /* #153 A15 — freeze panes: frozen rows sit UNDER the sticky thead, frozen
    columns stay left. z-index mirrors thead (3) without covering it. */
 .xlsx-table tr.xlsx-frozen-row td,