fix(mobile): bouton mode lecture visible uniquement fichier ouvert (BUG-016)

tests/frontend/mobile-editor.test.mjs

@@ -14,6 +14,7 @@ import { strict as assert } from "node:assert";
 import { JSDOM } from "jsdom";
 import { fileURLToPath, pathToFileURL } from "node:url";
 import path from "node:path";
+import { state } from "../../frontend/js/state.js";
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
@@ -62,6 +63,7 @@ const {
   initMobileEditor,
   toggleReadingMode,
   isReadingMode,
+  updateReadingButtonVisibility,
 } = mod;
 
 let testCount = 0;
@@ -223,5 +225,34 @@ test("reading mode exposes enter and exit controls", () => {
   assert.ok(w.document.getElementById("me-reading-exit"), "exit button exists");
 });
 
+test("reading button only shows while a file is open", () => {
+  const btn = w.document.getElementById("me-reading-btn");
+  state.currentPath = null;
+  updateReadingButtonVisibility();
+  assert.ok(btn.hidden, "hidden without an open file");
+  state.currentPath = "Notes/note.md";
+  updateReadingButtonVisibility();
+  assert.ok(!btn.hidden, "shown when a file is open");
+  state.currentPath = null;
+  updateReadingButtonVisibility();
+  assert.ok(btn.hidden, "hidden again once the file is closed");
+});
+
+test("reading button is hidden while the assistant panel is open", () => {
+  const btn = w.document.getElementById("me-reading-btn");
+  const panel = w.document.createElement("div");
+  panel.className = "bookslm-panel open";
+  w.document.body.appendChild(panel);
+  state.currentPath = "Notes/note.md";
+  updateReadingButtonVisibility();
+  assert.ok(btn.hidden, "hidden while the assistant is expanded");
+  panel.classList.add("hidden");
+  updateReadingButtonVisibility();
+  assert.ok(!btn.hidden, "shown again once the assistant is collapsed");
+  panel.remove();
+  state.currentPath = null;
+  updateReadingButtonVisibility();
+});
+
 console.log(`\n${passCount}/${testCount} tests passed\n`);
 process.exit(passCount === testCount ? 0 : 1);