Remember NeuralNet chat and simplify notifications

src/main/resources/static/css/neuralnet.css

@@ -1,4 +1,4 @@
 .nn-head{margin:1.3rem 0}.nn-head>span,.nn-chat small{color:var(--accent);font:700 .72rem/1 monospace;letter-spacing:.14em}.nn-head h1{margin:.4rem 0;color:var(--heading)}.nn-head p{color:var(--muted)}.nn-optin{max-width:700px}.nn-optin p{color:var(--muted);line-height:1.6}
 .nn-app{display:grid;grid-template-columns:minmax(270px,340px) minmax(0,1fr);gap:1rem;align-items:start}.nn-sidebar{display:grid;align-content:start;gap:1rem}.nn-request div{display:flex;gap:.45rem}.nn-request .mf-input{min-width:0}.nn-section{border-top:1px solid var(--border);padding-top:.85rem}.nn-section h2{font-size:.82rem;color:var(--heading);margin:0 0 .5rem}.nn-list{display:grid;gap:.45rem}.nn-item{display:flex;align-items:center;justify-content:space-between;gap:.5rem;border:1px solid var(--border);background:var(--surface-2);padding:.55rem .65rem;border-radius:8px;color:var(--text);font-size:.84rem}.nn-item button{border:0;background:none;color:var(--secondary);font:inherit;cursor:pointer}.nn-item button:hover,.nn-item button.active{color:var(--accent)}.nn-actions{display:flex;gap:.35rem}.nn-actions button{border:1px solid var(--border);padding:.22rem .38rem;border-radius:5px}
-.nn-chat{min-height:530px;display:flex;flex-direction:column}.nn-empty{flex:1;min-height:430px;display:grid;place-content:center;text-align:center;gap:.5rem;color:var(--muted)}.nn-empty strong{color:var(--heading);font-size:1.1rem}.nn-chat [data-nn-conversation]{display:flex;flex:1;flex-direction:column;min-height:494px}.nn-chat [data-nn-conversation][hidden]{display:none}.nn-chat header{border-bottom:1px solid var(--border);padding-bottom:.9rem}.nn-chat h2{margin:.25rem 0 0;color:var(--heading)}.nn-messages{display:flex;flex:1;flex-direction:column;gap:.6rem;min-height:340px;overflow:auto;padding:1rem 0}.nn-message{align-self:flex-start;max-width:min(80%,550px);padding:.65rem .8rem;border-radius:10px;background:var(--surface-2);border:1px solid var(--border);color:var(--text);line-height:1.45}.nn-message.mine{align-self:flex-end;border-color:var(--border-accent);background:color-mix(in srgb,var(--accent) 12%,var(--surface))}.nn-message small{display:block;margin-top:.35rem;color:var(--muted);font-size:.66rem}.nn-compose{display:grid;grid-template-columns:1fr auto;gap:.6rem;border-top:1px solid var(--border);padding-top:.85rem}.nn-compose textarea{min-height:52px;resize:vertical;background:var(--surface-2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:.65rem;font:inherit}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
+.nn-chat{min-height:530px;display:flex;flex-direction:column}.nn-empty{flex:1;min-height:430px;display:grid;place-content:center;text-align:center;gap:.5rem;color:var(--muted)}.nn-empty[hidden]{display:none}.nn-empty strong{color:var(--heading);font-size:1.1rem}.nn-chat [data-nn-conversation]{display:flex;flex:1;flex-direction:column;min-height:494px}.nn-chat [data-nn-conversation][hidden]{display:none}.nn-chat header{border-bottom:1px solid var(--border);padding-bottom:.9rem}.nn-chat h2{margin:.25rem 0 0;color:var(--heading)}.nn-messages{display:flex;flex:1;flex-direction:column;gap:.6rem;min-height:340px;overflow:auto;padding:1rem 0}.nn-message{align-self:flex-start;max-width:min(80%,550px);padding:.65rem .8rem;border-radius:10px;background:var(--surface-2);border:1px solid var(--border);color:var(--text);line-height:1.45}.nn-message.mine{align-self:flex-end;border-color:var(--border-accent);background:color-mix(in srgb,var(--accent) 12%,var(--surface))}.nn-message small{display:block;margin-top:.35rem;color:var(--muted);font-size:.66rem}.nn-compose{display:grid;grid-template-columns:1fr auto;gap:.6rem;border-top:1px solid var(--border);padding-top:.85rem}.nn-compose textarea{min-height:52px;resize:vertical;background:var(--surface-2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:.65rem;font:inherit}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
 @media(max-width:800px){.nn-app{grid-template-columns:1fr}.nn-chat{min-height:400px}.nn-chat [data-nn-conversation]{min-height:364px}.nn-messages{min-height:210px}.nn-request div{flex-wrap:wrap}.nn-request .mf-input{flex:1}}

src/main/resources/static/js/neuralnet.js

@@ -38,12 +38,41 @@
     }).join('') : '<span class="mf-small-hint">Noch keine Verbindungen.</span>';
     bindConnectionActions();
   }
+  function selectionKey() { return 'mindflux.neuralnet.selected.' + me; }
+  function savedSelection() {
+    try { return localStorage.getItem(selectionKey()); } catch (ignored) { return null; }
+  }
+  function saveSelection(user) {
+    try { localStorage.setItem(selectionKey(), user); } catch (ignored) { }
+  }
+  function clearSelection() {
+    try { localStorage.removeItem(selectionKey()); } catch (ignored) { }
+  }
+  function closeChat() {
+    q('[data-nn-empty]').hidden = false;
+    q('[data-nn-conversation]').hidden = true;
+  }
   async function refresh() {
     var data = await api('/overview');
     me = data.username;
     q('#nnOptIn').hidden = data.enabled;
     q('#nnApp').hidden = !data.enabled;
-    if (data.enabled) render(data);
+    if (!data.enabled) return;
+    var restored = false;
+    if (!selected) {
+      selected = savedSelection();
+      restored = Boolean(selected);
+    }
+    if (selected && !data.connections.includes(selected)) {
+      selected = null;
+      clearSelection();
+      closeChat();
+    }
+    render(data);
+    if (restored && selected) {
+      openChat(selected);
+      loadChat().catch(function (error) { message(error.message); });
+    }
   }
   async function loadChat() {
     if (!selected) return;
@@ -63,6 +92,7 @@
   }
   async function selectChat(user) {
     openChat(user);
+    saveSelection(user);
     try { await loadChat(); } catch (error) { message(error.message); }
   }
   function bindConnectionActions() {