ui fixes

frontend/src/lib/i18n.ts

@@ -109,6 +109,7 @@ const en = {
   "chat.greet": "How can I help, {name}?",
   "chat.greetSub": "Pick a model, then type below. Markdown is supported.",
   "chat.thinking": "Thinking…",
+  "chat.busyOther": "A reply is still generating in another chat — please wait.",
   "chat.placeholder": "Message KisAssistant…",
   "chat.send": "Send",
   "chat.attachTip": "Attach a file",
@@ -690,6 +691,7 @@ const es: Dict = {
   "chat.greet": "¿En qué te ayudo, {name}?",
   "chat.greetSub": "Elige un modelo y escribe abajo. Markdown soportado.",
   "chat.thinking": "Pensando…",
+  "chat.busyOther": "A reply is still generating in another chat — please wait.",
   "chat.placeholder": "Escribe a KisAssistant…",
   "chat.send": "Enviar",
   "chat.attachTip": "Adjuntar un archivo",
@@ -1262,6 +1264,7 @@ const fr: Dict = {
   "chat.greetSub":
     "Choisissez un modèle, puis écrivez ci-dessous. Markdown pris en charge.",
   "chat.thinking": "Réflexion…",
+  "chat.busyOther": "A reply is still generating in another chat — please wait.",
   "chat.placeholder": "Écrivez à KisAssistant…",
   "chat.send": "Envoyer",
   "chat.attachTip": "Joindre un fichier",
@@ -1832,6 +1835,7 @@ const ru: Dict = {
   "chat.greet": "Чем помочь, {name}?",
   "chat.greetSub": "Выберите модель и пишите ниже. Поддерживается Markdown.",
   "chat.thinking": "Думаю…",
+  "chat.busyOther": "A reply is still generating in another chat — please wait.",
   "chat.placeholder": "Сообщение KisAssistant…",
   "chat.send": "Отправить",
   "chat.attachTip": "Прикрепить файл",
@@ -2390,6 +2394,7 @@ const it: Dict = {
   "chat.greet": "Come posso aiutare, {name}?",
   "chat.greetSub": "Scegli un modello e scrivi qui sotto. Markdown supportato.",
   "chat.thinking": "Penso…",
+  "chat.busyOther": "A reply is still generating in another chat — please wait.",
   "chat.placeholder": "Scrivi a KisAssistant…",
   "chat.send": "Invia",
   "chat.attachTip": "Allega un file",
@@ -2954,6 +2959,7 @@ const pt: Dict = {
   "chat.greet": "Como posso ajudar, {name}?",
   "chat.greetSub": "Escolhe um modelo e escreve abaixo. Markdown suportado.",
   "chat.thinking": "A pensar…",
+  "chat.busyOther": "A reply is still generating in another chat — please wait.",
   "chat.placeholder": "Escreve ao KisAssistant…",
   "chat.send": "Enviar",
   "chat.attachTip": "Anexar ficheiro",

frontend/src/lib/localPrefs.ts

@@ -0,0 +1,99 @@
+/**
+ * Browser-local UI persistence (no server round-trip, per browser profile).
+ *
+ * - Selected model per account (`ka_model:<username>`): restored on boot when
+ *   still offered, otherwise the first available model wins.
+ * - Failed model attempts (`ka_failed_v1`): the error bubble + retry state
+ *   survive a refresh. The fake error text is NEVER stored server-side, so
+ *   model history stays clean — the bubble is re-created locally on load and
+ *   filtered out of every outgoing payload.
+ */
+
+export interface FailedEntry {
+  /** Position of the error bubble in the message list (trailing). */
+  index: number;
+  retryCount: number;
+  at: number;
+}
+
+const FAILED_KEY = "ka_failed_v1";
+const FAILED_MAX_AGE_MS = 30 * 24 * 3600_000;
+
+function readFailedMap(): Record<string, FailedEntry> {
+  try {
+    const raw = localStorage.getItem(FAILED_KEY);
+    if (!raw) return {};
+    const obj = JSON.parse(raw) as Record<string, unknown>;
+    const out: Record<string, FailedEntry> = {};
+    const now = Date.now();
+    for (const [k, v] of Object.entries(obj ?? {})) {
+      const e = v as FailedEntry;
+      if (
+        v !== null &&
+        typeof v === "object" &&
+        Number.isInteger(e.index) &&
+        e.index >= 0 &&
+        typeof e.retryCount === "number" &&
+        typeof e.at === "number" &&
+        now - e.at < FAILED_MAX_AGE_MS
+      ) {
+        out[k] = { index: e.index, retryCount: e.retryCount, at: e.at };
+      }
+    }
+    return out;
+  } catch {
+    return {};
+  }
+}
+
+function writeFailedMap(map: Record<string, FailedEntry>): void {
+  try {
+    localStorage.setItem(FAILED_KEY, JSON.stringify(map));
+  } catch {
+    // Private mode / quota — retry simply won't survive a refresh.
+  }
+}
+
+export function getFailedEntry(convId: string): FailedEntry | null {
+  return readFailedMap()[convId] ?? null;
+}
+
+export function setFailedEntry(convId: string, entry: FailedEntry): void {
+  const map = readFailedMap();
+  map[convId] = entry;
+  writeFailedMap(map);
+}
+
+export function clearFailedEntry(convId: string): void {
+  const map = readFailedMap();
+  if (map[convId] !== undefined) {
+    delete map[convId];
+    writeFailedMap(map);
+  }
+}
+
+function modelKey(username: string): string {
+  return `ka_model:${username.trim().toLowerCase()}`;
+}
+
+export function getSavedModel(username: string): string | null {
+  try {
+    return localStorage.getItem(modelKey(username));
+  } catch {
+    return null;
+  }
+}
+
+export function setSavedModel(username: string, id: string): void {
+  try {
+    localStorage.setItem(modelKey(username), id);
+  } catch {
+    // ignore — falls back to first model next boot
+  }
+}
+
+/** Saved pick when still offered, otherwise the first available model. */
+export function pickModel(available: { id: string }[], saved: string | null): string {
+  if (saved && available.some((m) => m.id === saved)) return saved;
+  return available[0]?.id ?? "";
+}