feat: finalisation éditeur Forge + mode hors-ligne PWA + consolidation roadmap

- Forge: Tab indent, Ctrl+K, auto-focus, AI status, messages erreur FR
- Forge: slash commands clean, cache-bust iframe, preview serveur
- Forge: iframe 82vh, hauteur auto, table inline, sélecteur langage
- PWA hors-ligne: IndexedDB (offline-db.js + offline.js)
- Mermaid: thème dark complet, highlight.js preview
- Backend: màj CSP, rename chain, bookmarks/history/shares
- Roadmap: consolidation dans docs/ROADMAP.md (75 items)
- Infra: docker-compose.podman.yml, suppression test-vault
- .gitignore: exclusion odysseus/

frontend/js/ui.js

@@ -517,6 +517,9 @@ export function initTagResize() {
 // Frontmatter Accent Card Builder
 // ---------------------------------------------------------------------------
 
+// Persist toggle state across document openings
+let _frontmatterOpen = false;
+
 export function buildFrontmatterCard(frontmatter) {
   // Helper: format date
   function formatDate(iso) {
@@ -530,11 +533,11 @@ export function buildFrontmatterCard(frontmatter) {
   // Extract boolean flags
   const booleanFlags = ["publish", "favoris", "template", "task", "archive", "draft", "private"].map((key) => ({ key, value: !!frontmatter[key] }));
 
-  // Toggle state
-  let isOpen = true;
+  // Toggle state (persisted across documents)
+  let isOpen = _frontmatterOpen;
 
   // Build header with chevron
-  const chevron = el("span", { class: "fm-chevron open" });
+  const chevron = el("span", { class: "fm-chevron " + (isOpen ? "open" : "closed") });
   chevron.innerHTML = '<i data-lucide="chevron-down" style="width:14px;height:14px"></i>';
 
   const fmHeader = el("div", { class: "fm-header" }, [chevron, document.createTextNode("Frontmatter")]);
@@ -612,9 +615,13 @@ export function buildFrontmatterCard(frontmatter) {
   // Assemble the card
   const acCard = el("div", { class: "ac-card" }, [acTop, acBody, acTagsRow, acFlagsRow]);
 
+  // Set initial display based on persisted state
+  if (!isOpen) acCard.style.display = "none";
+
   // Toggle functionality
   fmHeader.addEventListener("click", () => {
     isOpen = !isOpen;
+    _frontmatterOpen = isOpen;
     if (isOpen) {
       acCard.style.display = "block";
       chevron.classList.remove("closed");