personality: bool API, i18n across the app

- Collapse intent tri-state (respond/rewrite/compose) to `personality: bool` on /generate, /speak, and voicebox.speak. Drop respond entirely; keep compose as a standalone button via /profiles/{id}/compose. Remove /rewrite, /respond, and /speak profile endpoints.
- FloatingGenerateBox: Wand2 persona toggle + Dices compose button appear when the selected profile has a personality. ProfileCard badges Wand2 alongside the effects Sparkles.
- MCP bindings: default_intent column → default_personality: bool. Migration drops the legacy column.
- i18n: en / ja / zh-CN / zh-TW translation files filled out and wired through the capture, server, and profile UI.

```ts
voicebox.speak({
  text: "Deploy complete.",
  profile: "Morgan",
  personality: true, // rewrite through the profile's personality LLM
});
```

docs/content/docs/overview/captures.mdx

@@ -185,8 +185,8 @@ of your machine can talk to.
     The global hotkey flow that feeds most captures.
   </Card>
   <Card title="Voice Personalities" href="/overview/voice-personalities">
-    Per-profile compose / rewrite / respond modes for captures you want to
-    transform, not just transcribe.
+    Per-profile compose button and persona rewrite toggle for captures you
+    want to transform, not just transcribe.
   </Card>
   <Card title="Creating Voice Profiles" href="/overview/creating-voice-profiles">
     Promote a capture into a voice sample on a profile.