fix: sidebar mobile passe au-dessus de la barre d outils du bas (BUG-103)

- en mobile le sidebar de navigation (z-index 200) passait sous .mobile-toolbar (900, 64 px) : les dernieres entrees de l'arbre etaient masquees
- regle mobile .sidebar : z-index 200 -> 950 ; test de non-regression 'mobile sidebar over toolbar' dans unit.test.mjs

desktop/Cargo.lock

@@ -2626,7 +2626,7 @@ dependencies = [
 
 [[package]]
 name = "obsigate-desktop"
-version = "2.49.0"
+version = "2.49.1"
 dependencies = [
  "chrono",
  "env_logger",

desktop/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "obsigate-desktop"
-version = "2.49.0"
+version = "2.49.1"
 description = "ObsiGate Desktop — Porte d'entrée native pour vos vaults Obsidian"
 authors = ["Bruno Charest"]
 edition = "2021"

desktop/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://raw.githubusercontent.com/nicedoc/obsigate/main/desktop/tauri.conf.schema.json",
   "productName": "ObsiGate",
-  "version": "2.49.0",
+  "version": "2.49.1",
   "identifier": "com.obsigate.desktop",
   "build": {
     "frontendDist": "../frontend",