feat(voice): add typed AI chat beside voice

Chat sits next to the mic in the command dock. Replies are silent and never
request the microphone; the first message connects with the selected provider
and runs the same map actions as voice through each provider's text API
(OpenAI OPENAI_CHAT_MODEL, Gemini GEMINI_CHAT_MODEL via generateContent, which
never starts Live). Only one mode runs at a time.

- Chat panel rendered by the voice control presenter: conversation, recent and
  quick-command suggestions, Up/Down history, attachments (map-layer
  references or small UTF-8 text files, sent only with the message)
- Chat and voice panels sit above the dock or dock into the right rail's
  column; minimized bars sit centred above the dock, and height animates on
  swaps
- A centred panel steps down to its bar for the Location and Visual Presets
  trays without moving focus, rests above an open tray, and docks right while
  expanded over one; it returns to the centre once the trays close
- Minimized voice previews the last sentence from each side; the empty Voice
  Preview suggests things to say
- Settings opened from chat keep chat's frame and show the shared AI provider
  and quick commands; voice Settings show Back to voice
- Closing chat ends a typed session; the voice panel's close turns voice off
- The dock widens its voice control for the chat button and restyles its
  wings, which show icons only at 900px and below; assistant panels share the
  left panels' glass, and Cyber keeps its own surfaces
- Server text-chat handlers with body, time and per-IP limits
  (GEV_RATELIMIT_*_CHAT_PER_MIN), documented in SECURITY.md; tests and all
  eleven locales

Co-authored-by: Darren Dignam <[email protected]>

src/i18n/locales/de.json

@@ -2938,5 +2938,67 @@
   "Left panels": "Linke Panels",
   "Right panels": "Rechte Panels",
   "CONFIRMED": "BESTÄTIGT",
-  "PAD / RTLS": "STARTPLATZ / RTLS"
+  "PAD / RTLS": "STARTPLATZ / RTLS",
+  "Fly to Tokyo": "Nach Tokio fliegen",
+  "Show live flights": "Live-Flüge anzeigen",
+  "AI chat": "KI-Chat",
+  "GEV CHAT": "GEV-CHAT",
+  "Ask about the map. Tell it where to go.": "Frag zur Karte. Sag ihr, wohin es geht.",
+  "Close chat": "Chat schließen",
+  "Conversation": "Unterhaltung",
+  "Explore with a question": "Mit einer Frage erkunden",
+  "Find a place, explore live data, or change your view.": "Finde einen Ort, erkunde Live-Daten oder ändere deine Ansicht.",
+  "Attachments": "Anhänge",
+  "Remove attachment": "Anhang entfernen",
+  "Attach a map layer": "Kartenebene anhängen",
+  "Choose a layer…": "Ebene wählen…",
+  "Attach a file": "Datei anhängen",
+  "TXT, Markdown, CSV, JSON or GeoJSON · up to 10 KB each. Attachments are sent to your AI provider with your message.": "TXT, Markdown, CSV, JSON oder GeoJSON · je bis zu 10 KB. Anhänge werden mit deiner Nachricht an deinen KI-Anbieter gesendet.",
+  "Latest AI response": "Neueste KI-Antwort",
+  "Expand conversation": "Unterhaltung erweitern",
+  "Command suggestions": "Befehlsvorschläge",
+  "Expand chat": "Chat erweitern",
+  "Add attachment": "Anhang hinzufügen",
+  "Message GEV": "Nachricht an GEV",
+  "Ask GEV anything about the map…": "Frag GEV alles zur Karte…",
+  "Stop reply": "Antwort stoppen",
+  "Send message": "Nachricht senden",
+  "Panel position": "Panelposition",
+  "Move above the dock": "Über das Dock verschieben",
+  "Dock to the right": "Rechts andocken",
+  "Expand panel": "Panel erweitern",
+  "Minimize panel": "Panel minimieren",
+  "You can attach up to four items.": "Du kannst bis zu vier Elemente anhängen.",
+  "Attachments are too large together. Use smaller files.": "Die Anhänge sind zusammen zu groß. Verwende kleinere Dateien.",
+  "Choose a TXT, Markdown, CSV, JSON or GeoJSON file.": "Wähle eine TXT-, Markdown-, CSV-, JSON- oder GeoJSON-Datei.",
+  "Each file must be 10 KB or smaller.": "Jede Datei darf höchstens 10 KB groß sein.",
+  "Choose a non-empty UTF-8 text file.": "Wähle eine nicht leere UTF-8-Textdatei.",
+  "Connecting…": "Verbinde…",
+  "Thinking…": "Denkt nach…",
+  "Working on the map…": "Arbeitet an der Karte…",
+  "Silent chat · microphone off": "Stiller Chat · Mikrofon aus",
+  "Reply interrupted. You can try again.": "Antwort unterbrochen. Du kannst es erneut versuchen.",
+  "Could not connect. Try again.": "Verbindung fehlgeschlagen. Versuch es erneut.",
+  "Session ended. Send a message to start a new conversation.": "Sitzung beendet. Sende eine Nachricht, um eine neue Unterhaltung zu beginnen.",
+  "Connection timed out. Try again.": "Zeitüberschreitung der Verbindung. Versuch es erneut.",
+  "Chat closed.": "Chat geschlossen.",
+  "Connection stopped.": "Verbindung beendet.",
+  "Message and attachments are too large. Remove an attachment or shorten your message.": "Nachricht und Anhänge sind zu groß. Entferne einen Anhang oder kürze deine Nachricht.",
+  "Message was not sent. Try again.": "Nachricht wurde nicht gesendet. Versuch es erneut.",
+  "Reply stopped.": "Antwort gestoppt.",
+  "Suggestions": "Vorschläge",
+  "Recent": "Zuletzt",
+  "Quick commands": "Schnellbefehle",
+  "Open AI chat": "KI-Chat öffnen",
+  "CHAT": "CHAT",
+  "Back to chat": "Zurück zum Chat",
+  "Back to voice": "Zurück zur Sprachsteuerung",
+  "Latest voice exchange": "Letzter Sprachaustausch",
+  "Try saying": "Sag zum Beispiel",
+  "What am I looking at?": "Was sehe ich gerade?",
+  "AI Provider": "KI-Anbieter",
+  "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"
 }