fix(editeur): #93 garde-fous de session d'edition inline (onglets, ecriture externe) + hooks de versionnage documentes

Une session d'edition inline (Editer/Forge) qui possede la zone de contenu etait detruite par deux chemins qui vident cette zone : activation d'onglet (TabManager.activate, PaneTabManager.activate) -> detachInlineEditor() avant le placeholder ; evenement SSE index_updated -> reloadExternalWrite() recharge le tampon de l'editeur au lieu de re-rendre la vue lecture. Nouveau helper queryEditor() ; closeEditor() remet le conteneur dans la modale avant de restaurer en-tete/pied/marque. docs/CONTRIBUTING.md documente scripts/install-hooks.sh.

frontend/js/viewer.js

@@ -2,7 +2,7 @@
 import { api, AuthManager } from './auth.js';
 import { state } from './state.js';
 import { escapeHtml, safeCreateIcons, safeHighlight, getFileIcon, openEditor, copyToClipboard, activateInlineEditor, detachInlineEditor } from './utils.js';
-import { isInlineEditorActive } from './editor-inline.js';
+import { isInlineEditorActive, queryEditor } from './editor-inline.js';
 import { TabManager, closeMobileSidebar, ContextMenuManager, RightSidebarManager, showToast, buildFrontmatterCard } from './ui.js';
 import { syncActiveFileTreeItem, searchByTag, TagFilterService, refreshSidebarTreePreservingState, focusPathInSidebar } from './sidebar.js';
 import { AutocompleteDropdown, performAdvancedSearch } from './search.js';
@@ -768,8 +768,9 @@ export function renderFile(data) {
       state.editorVault = data.vault;
       state.editorPath = data.path;
     }
-    // Update header: show "Forge" brand + filename
-    var brand = modal.querySelector(".editor-brand");
+    // Update header: show "Forge" brand + filename (the header travels with the
+    // container in inline mode — query it wherever it lives, #93)
+    var brand = queryEditor(".editor-brand");
     var titleInp = document.getElementById("editor-title-input");
     var fileInp = document.getElementById("editor-filename-input");
     if (brand) brand.textContent = t("viewer.forge_brand");