fix(voice): address review of typed AI chat

Typed chat sessions no longer end on the voice inactivity timeout, and a
failed or stopped reply keeps the conversation: Stop cancels only the
reply in progress, and map actions that already ran stay in the model's
context. Each upstream request and map action gets its own deadline, old
tool results shrink instead of the history overflowing, and step limits,
a missing or rejected key, the OAuth lock and throttling each get their
own message.

- Server: OpenAI chat is off under GEV_PREFER_CODEX_OAUTH; chat throttles
  default to the provider's throttle; replies carry API_KEY_MISSING,
  API_KEY_REJECTED, CODEX_OAUTH_REQUIRED and RATE_LIMITED codes; upstream
  Retry-After passes through, and a rejected key (Gemini's invalid-key 400
  included) cools down for a minute
- Pinokio forwards the chat throttle settings
- UI: the reply reveal publishes only the message list; the border orbit
  runs only while busy; layers attach with a button or Enter; the log is
  aria-busy while a reply types out; auto-scroll respects a reader who
  scrolled up; Escape closes the attach menu; the chat gear says Settings;
  a note says chat bills the OpenAI key when voice uses ChatGPT sign-in
- Layout does less work while panel height animates; unused blurs removed
- Gemini voice start ends chat; the voice preview clears on every new
  session
- Tests for the route gates, client limits, attachments and the fixes

src/i18n/locales/de.json

@@ -3006,5 +3006,12 @@
   "The selected AI provider is shared by voice and chat.": "Der gewählte KI-Anbieter gilt für Sprache und Chat.",
   "Show quick commands": "Schnellbefehle anzeigen",
   "Chat replies are silent. No microphone access is needed.": "Chat-Antworten sind stumm. Kein Mikrofonzugriff nötig.",
-  "Chat": "Chat"
+  "Chat": "Chat",
+  "Attach layer": "Ebene anhängen",
+  "Typed chat uses your OpenAI API key. ChatGPT sign-in covers voice only.": "Der Text-Chat nutzt deinen OpenAI-API-Schlüssel. Die ChatGPT-Anmeldung gilt nur für Sprache.",
+  "Typed chat is unavailable while GEV_PREFER_CODEX_OAUTH requires ChatGPT OAuth.": "Der Text-Chat ist nicht verfügbar, solange GEV_PREFER_CODEX_OAUTH ChatGPT OAuth vorschreibt.",
+  "That request needed too many steps. Changes already made to the map stay in place.": "Diese Anfrage brauchte zu viele Schritte. Bereits vorgenommene Kartenänderungen bleiben erhalten.",
+  "That request needed too many steps. Try a simpler request.": "Diese Anfrage brauchte zu viele Schritte. Versuche eine einfachere Anfrage.",
+  "The provider rejected the API key. Check it in Provider Settings.": "Der Anbieter hat den API-Schlüssel abgelehnt. Prüfe ihn in den Anbieter-Einstellungen.",
+  "Too many chat requests. Try again in {seconds} s.": "Zu viele Chat-Anfragen. In {seconds} s erneut versuchen."
 }