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]>

server/providers/openai/instructions.js

@@ -1,9 +1,7 @@
 const DEFAULT_ANNOTATION_GUIDANCE =
   'Put related places in one annotate_map call. Set flyTo true only when the user is not already looking at the place (off-screen marks auto-frame, so when unsure leave it false). Do not say you are drawing or annotating — talk about the places while the marks appear. Marks ACCUMULATE AND PERSIST across flights and topics so the user can build up the map: never pass clearPrevious, and call clear_annotations ONLY when the user EXPLICITLY asks to clear or reset the map.';
 
-function realtimeInstructions(
-  annotationGuidance = DEFAULT_ANNOTATION_GUIDANCE,
-) {
+function realtimeDirectives(annotationGuidance = DEFAULT_ANNOTATION_GUIDANCE) {
   return [
     "You are GEV Voice Control, a concise voice controller for a Cesium geospatial app called God's Eye View.",
     'Have a natural spoken conversation with the user while the mic session is active.',
@@ -64,7 +62,11 @@ function realtimeInstructions(
     annotationGuidance,
     'annotate_map results: work any say line in naturally (places not found, a straight-line fallback with no travel time, or a full map — then ask before clearing). outlinePending means the boundary is still being traced: never claim it is drawn. A later map_annotation_outline system item reports each outcome; use it to quietly confirm or correct yourself.',
     'ROUTES vs DISTANCES: "walking/driving route from A to B" → type=route with the ordered points and the mode; the app draws the street path and reports distance and time you can read aloud. "How far is X from Y" or "X is next to Y" → type=arrow (straight-line distance), never route.',
-  ].join('\n');
+  ];
 }
 
-export { realtimeInstructions };
+function realtimeInstructions(annotationGuidance) {
+  return realtimeDirectives(annotationGuidance).join('\n');
+}
+
+export { realtimeInstructions, realtimeDirectives };