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/fr.json

@@ -3008,5 +3008,67 @@
   "Left panels": "Panneaux de gauche",
   "Right panels": "Panneaux de droite",
   "CONFIRMED": "CONFIRMÉE",
-  "PAD / RTLS": "PAS DE TIR / RTLS"
+  "PAD / RTLS": "PAS DE TIR / RTLS",
+  "Fly to Tokyo": "Aller à Tokyo",
+  "Show live flights": "Afficher les vols en direct",
+  "AI chat": "Discussion IA",
+  "GEV CHAT": "DISCUSSION GEV",
+  "Ask about the map. Tell it where to go.": "Posez une question sur la carte. Dites-lui où aller.",
+  "Close chat": "Fermer la discussion",
+  "Conversation": "Conversation",
+  "Explore with a question": "Explorer avec une question",
+  "Find a place, explore live data, or change your view.": "Trouvez un lieu, explorez des données en direct ou changez de vue.",
+  "Attachments": "Pièces jointes",
+  "Remove attachment": "Retirer la pièce jointe",
+  "Attach a map layer": "Joindre une couche de carte",
+  "Choose a layer…": "Choisir une couche…",
+  "Attach a file": "Joindre un fichier",
+  "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 ou GeoJSON · 10 Ko max. chacun. Les pièces jointes sont envoyées à votre fournisseur d’IA avec votre message.",
+  "Latest AI response": "Dernière réponse de l’IA",
+  "Expand conversation": "Agrandir la conversation",
+  "Command suggestions": "Suggestions de commandes",
+  "Expand chat": "Agrandir la discussion",
+  "Add attachment": "Ajouter une pièce jointe",
+  "Message GEV": "Message à GEV",
+  "Ask GEV anything about the map…": "Demandez à GEV ce que vous voulez sur la carte…",
+  "Stop reply": "Arrêter la réponse",
+  "Send message": "Envoyer le message",
+  "Panel position": "Position du panneau",
+  "Move above the dock": "Placer au-dessus du dock",
+  "Dock to the right": "Ancrer à droite",
+  "Expand panel": "Agrandir le panneau",
+  "Minimize panel": "Réduire le panneau",
+  "You can attach up to four items.": "Vous pouvez joindre jusqu’à quatre éléments.",
+  "Attachments are too large together. Use smaller files.": "Les pièces jointes sont trop volumineuses ensemble. Utilisez des fichiers plus petits.",
+  "Choose a TXT, Markdown, CSV, JSON or GeoJSON file.": "Choisissez un fichier TXT, Markdown, CSV, JSON ou GeoJSON.",
+  "Each file must be 10 KB or smaller.": "Chaque fichier doit faire 10 Ko ou moins.",
+  "Choose a non-empty UTF-8 text file.": "Choisissez un fichier texte UTF-8 non vide.",
+  "Connecting…": "Connexion…",
+  "Thinking…": "Réflexion…",
+  "Working on the map…": "Travail sur la carte…",
+  "Silent chat · microphone off": "Discussion silencieuse · micro coupé",
+  "Reply interrupted. You can try again.": "Réponse interrompue. Vous pouvez réessayer.",
+  "Could not connect. Try again.": "Connexion impossible. Réessayez.",
+  "Session ended. Send a message to start a new conversation.": "Session terminée. Envoyez un message pour démarrer une nouvelle conversation.",
+  "Connection timed out. Try again.": "Délai de connexion dépassé. Réessayez.",
+  "Chat closed.": "Discussion fermée.",
+  "Connection stopped.": "Connexion arrêtée.",
+  "Message and attachments are too large. Remove an attachment or shorten your message.": "Le message et les pièces jointes sont trop volumineux. Retirez une pièce jointe ou raccourcissez votre message.",
+  "Message was not sent. Try again.": "Le message n’a pas été envoyé. Réessayez.",
+  "Reply stopped.": "Réponse arrêtée.",
+  "Suggestions": "Suggestions",
+  "Recent": "Récents",
+  "Quick commands": "Commandes rapides",
+  "Open AI chat": "Ouvrir la discussion IA",
+  "CHAT": "DISCUSSION",
+  "Back to chat": "Retour à la discussion",
+  "Back to voice": "Retour à la voix",
+  "Latest voice exchange": "Dernier échange vocal",
+  "Try saying": "Essayez de dire",
+  "What am I looking at?": "Qu’est-ce que je regarde ?",
+  "AI Provider": "Fournisseur d’IA",
+  "The selected AI provider is shared by voice and chat.": "Le fournisseur d’IA choisi est partagé par la voix et la discussion.",
+  "Show quick commands": "Afficher les commandes rapides",
+  "Chat replies are silent. No microphone access is needed.": "Les réponses de la discussion sont silencieuses. Aucun accès au micro n’est nécessaire.",
+  "Chat": "Discussion"
 }