feat(mobile): ruban d'edition style Obsidian + correctifs mobile (#83, BUG-017 a BUG-020)

- #83: ruban horizontal defilable ancre au-dessus du clavier, commandes
  etendues (titres, barre, surligne, code bloc, citation, listes, cases,
  wikilinks, tags, pieces jointes, undo/redo, colle, police) et
  personnalisation persistee via l'icone engrenage
- BUG-017: cartes du tableau de bord compressibles (min-width:0)
- BUG-018: en-tete editeur mobile compact, boutons Annuler/Sauvegarder
  accessibles, barre IA plus tactile
- BUG-019: ancrage du ruban via visualViewport (--kb-offset)
- BUG-020: suppression de la double barre de defilement

Tests: mobile-editor 35/35, ai 50/50, 9 suites JSDOM, validate-imports,
pytest 961 passed / 6 skipped, ruff + mypy 0.

tests/frontend/mobile-editor.test.mjs

@@ -52,11 +52,15 @@ const mod = await import(
 
 const {
   FORMAT_ACTIONS,
+  RIBBON_COMMANDS,
+  DEFAULT_RIBBON_COMMANDS,
   MIN_EDITOR_FONT,
   MAX_EDITOR_FONT,
   clampZoom,
   detectSwipe,
   formatChange,
+  normalizeRibbonCommands,
+  moveRibbonCommand,
   insertText,
   applyFormatToTextarea,
   applyEditorFontSize,
@@ -161,7 +165,7 @@ test("formatChange link builds [selection](url) and selects the url", () => {
 });
 
 test("formatChange returns null for an unknown action", () => {
-  assert.equal(formatChange("abc", 0, 0, "strike"), null);
+  assert.equal(formatChange("abc", 0, 0, "nope"), null);
 });
 
 test("insertText builds an insertion change at the cursor", () => {
@@ -170,6 +174,62 @@ test("insertText builds an insertion change at the cursor", () => {
   assert.deepEqual(c.selection, { anchor: 8, head: 8 });
 });
 
+// ── ROADMAP #83 — ribbon command transforms ────────────────────────────────
+test("formatChange strike and highlight wrap with the right markers", () => {
+  assert.equal(formatChange("x", 0, 1, "strike").changes.insert, "~~x~~");
+  assert.equal(formatChange("x", 0, 1, "highlight").changes.insert, "==x==");
+});
+
+test("formatChange wikilink and attachment wrap with brackets", () => {
+  assert.equal(formatChange("Note", 0, 4, "wikilink").changes.insert, "[[Note]]");
+  assert.equal(formatChange("img.png", 0, 7, "attachment").changes.insert, "![[img.png]]");
+});
+
+test("formatChange tag prefixes a hash", () => {
+  const c = formatChange("devops", 0, 6, "tag");
+  assert.equal(c.changes.insert, "#devops");
+  assert.deepEqual(c.selection, { anchor: 7, head: 7 });
+});
+
+test("formatChange heading replaces an existing heading level", () => {
+  const c = formatChange("# Title", 0, 7, "h2");
+  assert.equal(c.changes.insert, "## Title");
+});
+
+test("formatChange heading toggles off the same level", () => {
+  const c = formatChange("## Title", 0, 8, "h2");
+  assert.equal(c.changes.insert, "Title");
+});
+
+test("formatChange quote, bullet, checkbox and ordered list prefix lines", () => {
+  assert.equal(formatChange("a\nb", 0, 3, "quote").changes.insert, "> a\n> b");
+  assert.equal(formatChange("a\nb", 0, 3, "bullet").changes.insert, "- a\n- b");
+  assert.equal(formatChange("a\nb", 0, 3, "checkbox").changes.insert, "- [ ] a\n- [ ] b");
+  assert.equal(formatChange("a\nb", 0, 3, "ordered").changes.insert, "1. a\n2. b");
+});
+
+test("formatChange codeblock wraps the selected block in fences", () => {
+  const c = formatChange("code", 0, 4, "codeblock");
+  assert.equal(c.changes.insert, "```\ncode\n```");
+});
+
+test("formatChange indent and dedent shift lines", () => {
+  assert.equal(formatChange("a\nb", 0, 3, "indent").changes.insert, "  a\n  b");
+  assert.equal(formatChange("  a\n\tb", 0, 6, "dedent").changes.insert, "a\nb");
+});
+
+test("normalizeRibbonCommands filters unknown ids and falls back to default", () => {
+  assert.deepEqual(normalizeRibbonCommands(["bold", "nope", "bold"]), ["bold"]);
+  assert.deepEqual(normalizeRibbonCommands([]), [...DEFAULT_RIBBON_COMMANDS]);
+  assert.deepEqual(normalizeRibbonCommands(null), [...DEFAULT_RIBBON_COMMANDS]);
+});
+
+test("moveRibbonCommand reorders within bounds", () => {
+  assert.deepEqual(moveRibbonCommand(["a", "b", "c"], "b", -1), ["b", "a", "c"]);
+  assert.deepEqual(moveRibbonCommand(["a", "b", "c"], "c", 1), ["a", "b", "c"]);
+  assert.deepEqual(moveRibbonCommand(["a", "b"], "a", -1), ["a", "b"]);
+});
+
 // ── Textarea application ───────────────────────────────────────────────────
 test("applyFormatToTextarea formats the current textarea selection", () => {
   const ta = w.document.createElement("textarea");
@@ -187,17 +247,29 @@ test("applyFormatToTextarea returns false without an element", () => {
 });
 
 // ── DOM wiring ─────────────────────────────────────────────────────────────
-test("initMobileEditor builds the floating toolbar with the five actions", () => {
+test("initMobileEditor builds the ribbon toolbar with the gear button", () => {
   initMobileEditor();
   const bar = w.document.getElementById("me-toolbar");
   assert.ok(bar, "toolbar exists");
-  for (const action of FORMAT_ACTIONS) {
-    assert.ok(w.document.getElementById("me-fmt-" + action), action + " button exists");
+  assert.ok(bar.classList.contains("me-ribbon"), "uses the ribbon style");
+  assert.ok(w.document.querySelector("#me-toolbar .me-ribbon-scroll"), "scroll container exists");
+  for (const id of DEFAULT_RIBBON_COMMANDS) {
+    assert.ok(w.document.getElementById("me-cmd-" + id), id + " command exists");
   }
-  assert.ok(w.document.getElementById("me-paste"), "paste button exists");
+  assert.ok(w.document.getElementById("me-ribbon-gear"), "gear button exists");
   assert.ok(w.document.getElementById("me-resize-handle"), "resize handle exists");
 });
 
+test("ribbon customiser opens and lists commands", () => {
+  const gear = w.document.getElementById("me-ribbon-gear");
+  gear.click();
+  const sheet = w.document.getElementById("me-ribbon-customizer");
+  assert.ok(sheet, "customiser sheet exists");
+  assert.ok(sheet.classList.contains("open"), "customiser is open");
+  assert.ok(sheet.querySelectorAll(".me-ribbon-cmd-row").length >= RIBBON_COMMANDS.length,
+    "every command is listed");
+});
+
 test("initMobileEditor is idempotent", () => {
   initMobileEditor();
   const bars = w.document.querySelectorAll("#me-toolbar");