feat: node info, build info and acrylic web theme

Squash of recent dev work: return_session login, backend switcher, line
detail timeline, overview strips, node platform/country/ISP info with flags
and icons, build info (version, tag, time) behind site.show_build, and the
acrylic display theme.

web/display/src/App.tsx

@@ -1,3 +1,4 @@
+import { BuildFooter } from './BuildFooter'
 import { NavLink, Navigate, Route, Routes } from 'react-router-dom'
 import { SourceButton, ThemeToggle } from '@shared/ui'
 import { Compare } from './pages/Compare'
@@ -9,9 +10,6 @@ export function App() {
     <>
       <header className="topbar">
         <div className="inner">
-          <NavLink to="/" className="brand">
-            线路质量
-          </NavLink>
           <nav className="topnav">
             <NavLink to="/" end className={({ isActive }) => (isActive ? 'active' : '')}>
               总览
@@ -21,7 +19,7 @@ export function App() {
             </NavLink>
             <a href="/admin/">管理</a>
           </nav>
-          <SourceButton />
+          <SourceButton variant="status" />
           <ThemeToggle />
         </div>
       </header>
@@ -31,6 +29,10 @@ export function App() {
         <Route path="/compare" element={<Compare />} />
         <Route path="*" element={<Navigate to="/" replace />} />
       </Routes>
+      <footer className="site-foot">
+        国家和运营商由 <a href="https://ip.007995.xyz/" target="_blank" rel="noreferrer">ip.007995.xyz</a> 查询
+        <BuildFooter />
+      </footer>
     </>
   )
 }