feat: style device select dropdown for new session dialog

muxplex/frontend/style.css

@@ -1522,6 +1522,26 @@ body {
   color: var(--text-dim);
 }
 
+.new-session-device-select {
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  font-size: 12px;
+  font-family: var(--font-ui);
+  padding: 4px 6px;
+  color: var(--text);
+  outline: none;
+  margin-right: 6px;
+  vertical-align: middle;
+}
+
+.fab-input-overlay .new-session-device-select {
+  display: block;
+  width: 100%;
+  margin-bottom: 6px;
+  margin-right: 0;
+}
+
 /* ============================================================
    Sidebar sticky footer (+ New button)
    ============================================================ */

muxplex/frontend/tests/test_app.mjs

@@ -4291,3 +4291,11 @@ test('createNewSession matches remote sessions by sessionKey in poll loop', () =
     'createNewSession must compute expected sessionKey for remote session matching',
   );
 });
+
+test('CSS has new-session-device-select styling', () => {
+  const source = fs.readFileSync(new URL('../style.css', import.meta.url), 'utf8');
+  assert.ok(
+    source.includes('.new-session-device-select'),
+    'style.css must have .new-session-device-select rule',
+  );
+});