diff --git a/src/home/rail/HomeNavItem.tsx b/src/home/rail/HomeNavItem.tsx
index 55d6b37..df692d2 100644
--- a/src/home/rail/HomeNavItem.tsx
+++ b/src/home/rail/HomeNavItem.tsx
@@ -4,13 +4,19 @@ interface Props {
   icon: ReactElement;
   label: string;
   active?: boolean;
+  onClick?: () => void;
 }
 
-export function HomeNavItem({ icon, label, active = false }: Props) {
+export function HomeNavItem({ icon, label, active = false, onClick }: Props) {
   return (
-    <div className={`home-nav-item${active ? " home-nav-item--active" : ""}`}>
+    <button
+      type="button"
+      className={`home-nav-item${active ? " home-nav-item--active" : ""}`}
+      onClick={onClick}
+      disabled={!onClick}
+    >
       {icon}
       <span>{label}</span>
-    </div>
+    </button>
   );
 }
diff --git a/src/projects/actions.ts b/src/projects/actions.ts
index cce043b..22865ed 100644
--- a/src/projects/actions.ts
+++ b/src/projects/actions.ts
@@ -38,6 +38,10 @@ export function renameProject(id: string, newName: string): void {
   const project = useProjectStore.getState().projects.find((p) => p.id === id);
   if (!project) throw new Error(`unknown project: ${id}`);
   if (project.name === name) return;
+  const duplicate = useProjectStore
+    .getState()
+    .projects.some((p) => p.id !== id && p.name.toLowerCase() === name.toLowerCase());
+  if (duplicate) throw new Error(`Un projet avec le nom « ${name} » existe déjà.`);
   useProjectStore.getState().upsert({ ...project, name });
 }
 
@@ -64,7 +68,7 @@ async function createProjectImpl(input: {
   const projectPath = joinChild(parentDir, name);
   const exists = await invoke<boolean>("fs_path_exists", { path: projectPath });
   if (exists) {
-    throw new Error(`Un dossier existe déjà à ${projectPath}.`);
+    throw new Error(`Un projet avec ce nom existe déjà dans ce dossier.`);
   }
   await invoke("fs_ensure_dir", { dirPath: projectPath });
 
@@ -191,5 +195,10 @@ async function openProjectImpl(id: string): Promise<void> {
   }
 
   useProjectStore.getState().setActive(id, { touch: true });
+  // Reset open tabs so stale paths from the previous project don't linger.
+  // The IDE hydration logic in `bootstrapIdeStore` handles restoring tabs
+  // from the persisted snapshot, but on a live switch the old tabs would
+  // survive until the next persistence round-trip.
+  useIdeStore.setState({ openFiles: [], activeFile: null });
   useIdeStore.getState().setView("ide");
 }
diff --git a/src/projects/bootstrap.ts b/src/projects/bootstrap.ts
index 9adb0ed..75d69d0 100644
--- a/src/projects/bootstrap.ts
+++ b/src/projects/bootstrap.ts
@@ -38,7 +38,13 @@ export async function bootstrapProjects(): Promise<void> {
     useProjectStore.getState().hydrate(existing);
     const activeId = existing.activeProjectId ?? existing.projects[0]?.id ?? null;
     if (activeId && existing.projects.some((p) => p.id === activeId)) {
-      await openProject(activeId);
+      try {
+        await openProject(activeId);
+      } catch (err) {
+        // The project's folder may have been deleted externally while the
+        // app was closed. Fall through to the Home view instead of crashing.
+        console.warn("bootstrap: could not reopen last project, showing Home", err);
+      }
     }
     return;
   }
diff --git a/src/projects/diskAutoSave.ts b/src/projects/diskAutoSave.ts
index e0ae81c..075cc1a 100644
--- a/src/projects/diskAutoSave.ts
+++ b/src/projects/diskAutoSave.ts
@@ -1,5 +1,6 @@
 import { invoke } from "@tauri-apps/api/core";
 
+import { toast } from "../ide/shell/toastStore";
 import { persistenceEvents } from "../vfs/persistence";
 import type { VirtualFS } from "../vfs/VirtualFS";
 import { useProjectStore } from "./projectStore";
@@ -66,6 +67,7 @@ export function attachDiskAutoSave(vfs: VirtualFS): AutoSaveHandle {
           }
         } catch (err) {
           console.error("disk autosave job failed", relPath, err);
+          toast.error(`Impossible de sauvegarder ${relPath} sur le disque.`);
         }
       }
       const paths = vfs.listFiles();
diff --git a/src/styles/global.css b/src/styles/global.css
index 7f993db..0e2da98 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -595,6 +595,12 @@ button.brand {
   color: var(--fg-0);
   background: var(--bg-1);
 }
+.tab:focus-visible {
+  outline: none;
+  color: var(--fg-0);
+  background: var(--bg-1);
+  box-shadow: inset 0 -2px 0 var(--accent);
+}
 .tab--active {
   color: var(--fg-0);
   background: var(--bg-1);
@@ -1443,6 +1449,25 @@ button.brand {
   color: var(--fg-1);
   font-size: 13px;
   position: relative;
+  width: 100%;
+  text-align: left;
+  cursor: default;
+  transition:
+    background 0.12s,
+    color 0.12s;
+}
+.home-nav-item:not([disabled]):hover {
+  background: var(--bg-2);
+  color: var(--fg-0);
+}
+.home-nav-item:focus-visible {
+  outline: none;
+  background: var(--bg-2);
+  color: var(--fg-0);
+}
+.home-nav-item[disabled] {
+  opacity: 0.5;
+  cursor: default;
 }
 .home-nav-item--active {
   background: var(--bg-3);
@@ -1477,7 +1502,7 @@ button.brand {
   align-items: center;
   gap: 8px;
   padding: 6px 0;
-  cursor: default;
+  cursor: pointer;
   color: inherit;
 }
 .home-rail-link:hover {
@@ -1779,8 +1804,8 @@ button.brand {
   text-align: left;
   cursor: pointer;
   position: relative;
-  animation: proj-in 220ms ease-out both;
-  animation-delay: min(calc(var(--proj-idx, 0) * 40ms), 240ms);
+  animation: proj-in 180ms ease-out both;
+  animation-delay: min(calc(var(--proj-idx, 0) * 25ms), 120ms);
   transition:
     background 0.12s,
     border-color 0.12s,