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/ui/stores/voice.js

@@ -35,5 +35,25 @@ export const useVoiceStore = defineStore('gev-voice', () => {
     bars.value = next && markRaw(next);
   }
 
-  return { view, publish, controls, connect, bars, publishBars };
+  /**
+   * The chat conversation, apart from the view: a typed reply reveals frame
+   * by frame, and only the message list renders it.
+   */
+  const chat = shallowRef([]);
+
+  /** @param {Array<{id: number, role: string, text: string}>} next */
+  function publishChat(next) {
+    chat.value = markRaw(next ?? []);
+  }
+
+  return {
+    view,
+    publish,
+    controls,
+    connect,
+    bars,
+    publishBars,
+    chat,
+    publishChat,
+  };
 });