feat: on a phone Вверх, the path and Обновить share one line; the header is one line without the logo

internal/server/web/static/app.css

@@ -225,6 +225,12 @@ input.sw:disabled { opacity: .45; cursor: not-allowed; }
     overflow-x: auto; white-space: nowrap; scrollbar-width: none; }
   header.topbar nav::-webkit-scrollbar { display: none; }
   header.topbar nav > * { margin-left: 0 !important; flex: none; }
+  /* One line: no logo, the links and the account on the right; they
+     scroll sideways when they do not fit. */
+  header.topbar .brand { display: none; }
+  header.topbar nav { flex: 1 1 auto; min-width: 0; }
+  header.topbar nav > :first-child { margin-left: auto !important; }
+  header.topbar nav #status { flex: 0 1 auto; min-width: 0; max-width: 30vw; }
   .acct-add { flex-wrap: wrap; }
   .acct-add button { width: 100%; }
   .acct-keys li { flex-wrap: wrap; }
@@ -522,7 +528,8 @@ table.fm .act { flex-wrap:nowrap; }
   table.fm .c-act { width:1%; }
   table.fm td, table.fm th { padding:7px 4px; }
   .ic { margin-right:4px; }
-  .fm-bar .fm-pathbox { flex:1 1 100%; order:-1; }
+  /* Вверх, the path and Обновить on one line: the path gives way. */
+  .fm-bar .fm-pathbox { flex:1 1 0; min-width:0; }
   /* The selection's buttons on the line of the blue ones: those a little
      narrower, the count by the buttons only as a number. */
   .fp-sel .fp-selinfo { font-size:12px; }
@@ -778,6 +785,7 @@ p.mv-a { margin:0; font-size:13px; }
 /* The selection's buttons stay on the line of the blue ones while they fit:
    those a little more compact; the line breaks only when there is no room. */
 .fpane.narrow .fm-bar { gap:5px; }
+.fpane.narrow .fm-bar .fm-pathbox { flex:1 1 0; min-width:0; order:0; }
 .fpane.narrow .fm-bar .btn.ico { padding-left:8px; padding-right:8px; gap:4px; font-size:12.5px; }
 .fpane.narrow .fp-sel { gap:4px; }
 .fpane.narrow .fp-selinfo { margin-right:6px; }
@@ -803,3 +811,35 @@ dialog.machinedlg { max-width:1000px; width:94vw; max-height:90vh; padding:0; ov
   dialog.machinedlg { width:100vw; max-width:none; height:100dvh; max-height:none; margin:0; border-radius:0; }
   .machinedlg .frag-area { max-height:calc(100dvh - 58px); }
 }
+
+/* Настройки › ИИ-ассистент. */
+.ai-form { display:grid; gap:10px; max-width:520px; }
+.ai-form label { display:grid; gap:4px; font-size:13px; color:var(--muted); }
+
+/* The assistant: a round button, and the chat over the page's corner. */
+.ai-fab { position:fixed; right:18px; bottom:18px; z-index:40; width:52px; height:52px; padding:0; border-radius:50%;
+          display:inline-flex; align-items:center; justify-content:center; box-shadow:0 8px 24px rgba(0,0,0,.45); }
+.ai-fab[hidden] { display:none; }
+body.touch.term-active .ai-fab { bottom:104px; }
+.ai-box { position:fixed; right:18px; bottom:82px; z-index:41; width:400px; max-width:calc(100vw - 24px); height:min(600px, calc(100vh - 120px));
+          display:flex; flex-direction:column; background:var(--panel); border:1px solid var(--border); border-radius:12px;
+          box-shadow:0 18px 44px rgba(0,0,0,.55); overflow:hidden; }
+.ai-box[hidden] { display:none; }
+.ai-head { display:flex; align-items:center; gap:8px; padding:10px 12px; border-bottom:1px solid var(--border); }
+.ai-head .ai-where { font-size:12px; }
+.ai-list { flex:1; overflow:auto; padding:12px; display:flex; flex-direction:column; gap:10px; }
+.ai-msg { max-width:92%; padding:8px 11px; border-radius:10px; font-size:14px; line-height:1.45; overflow-wrap:anywhere; }
+.ai-msg.user { align-self:flex-end; background:#16324f; white-space:pre-wrap; }
+.ai-msg.assistant { align-self:flex-start; background:#151a21; border:1px solid var(--border); }
+.ai-msg.wait::after { content:'…'; color:var(--muted); }
+.ai-code { margin:6px 0; }
+.ai-code pre { margin:0; padding:8px; background:#0c0f13; border:1px solid var(--border); border-radius:7px; overflow:auto; font-size:12.5px; white-space:pre-wrap; }
+.ai-code .ai-run { margin-top:6px; }
+.ai-form-in { display:flex; gap:8px; padding:10px; border-top:1px solid var(--border); }
+.ai-form-in textarea { flex:1; resize:none; font:inherit; font-size:14px; padding:8px 10px; color:var(--text);
+                       background:#0c0f13; border:1px solid var(--border); border-radius:8px; }
+.ai-form-in textarea:focus { outline:none; border-color:var(--accent); }
+@media (max-width: 640px) {
+  .ai-box { right:8px; left:8px; width:auto; max-width:none; bottom:78px; height:calc(100dvh - 150px); }
+  body.touch.term-active .ai-box { bottom:164px; height:calc(100dvh - 236px); }
+}