feat: Move version number to sidebar next to MUH logo

- Add version number in small font next to MUH logo in sidebar
- Remove version footer from HomePage
- Add CSS styling for sidebar version display

frontend/src/layout/AppShell.tsx

@@ -1,5 +1,6 @@
 import { NavLink, Outlet, useLocation, useNavigate } from "react-router-dom";
 import { useSession } from "../lib/session";
+import { APP_VERSION } from "../lib/version";
 
 const PAGE_TITLES: Record<string, string> = {
   "/home": "Startseite",
@@ -39,7 +40,9 @@ export default function AppShell() {
     <div className="app-shell">
       <aside className="sidebar">
         <div className="sidebar__brand">
-          <div className="sidebar__logo">MUH</div>
+          <div className="sidebar__logo">
+            MUH <span className="sidebar__version">({APP_VERSION})</span>
+          </div>
         </div>
 
         <nav className="sidebar__nav">

frontend/src/pages/HomePage.tsx

@@ -1,7 +1,6 @@
 import { FormEvent, useEffect, useState } from "react";
 import { useNavigate } from "react-router-dom";
 import { apiGet } from "../lib/api";
-import { APP_VERSION } from "../lib/version";
 import type { DashboardOverview, LookupResult } from "../lib/types";
 
 function formatDate(value: string) {
@@ -175,11 +174,6 @@ export default function HomePage() {
           <div className="empty-state">Noch keine Proben vorhanden.</div>
         )}
       </section>
-
-      {/* Version Footer */}
-      <footer className="version-footer">
-        <span>Version {APP_VERSION}</span>
-      </footer>
     </div>
   );
 }

frontend/src/styles/global.css

@@ -102,6 +102,13 @@ a {
   letter-spacing: 0.08em;
 }
 
+.sidebar__version {
+  font-size: 0.65em;
+  font-weight: 400;
+  opacity: 0.7;
+  margin-left: 6px;
+}
+
 .sidebar__nav {
   display: grid;
   gap: 10px;