feat(tts): show Gemini voice character (style) as a label badge

Google does not publish gender for the 30 prebuilt Gemini voices —
inclusive design — but does publish a one-word style descriptor
(Bright, Firm, Smooth, Mature, Lively, etc.). Surface it so users can
pick by character.

- `audio.VoiceOption` gains `Labels map[string]string` (provider-
  specific descriptors). ElevenLabs already returns labels via API;
  Gemini now hardcodes `{"style": "..."}` per voice from the official
  catalog.
- Web + desktop `mapCapVoiceToPortal` passes labels through. Both
  pickers' `LABEL_KEYS` now include `"style"`, so the existing badge
  rendering picks it up — first 1–2 entries shown next to the name.
- TS `VoiceOption` interface (web + desktop) gains optional `labels`.

No gender field is invented for Gemini voices.

internal/audio/gemini/voices.go

@@ -4,37 +4,43 @@ import "github.com/nextlevelbuilder/goclaw/internal/audio"
 
 // geminiVoices is the static catalog of 30 Gemini prebuilt voices.
 // Source: https://ai.google.dev/gemini-api/docs/speech-generation (April 2026)
+//
+// Google does NOT publish gender for these voices — by design, to keep voice
+// selection inclusive. Only style descriptors are official. We surface the
+// style as a label so users can pick by character (Bright/Firm/Smooth/etc.).
+func styleLabel(style string) map[string]string { return map[string]string{"style": style} }
+
 var geminiVoices = []audio.VoiceOption{
-	{VoiceID: "Zephyr", Name: "Zephyr"},
-	{VoiceID: "Puck", Name: "Puck"},
-	{VoiceID: "Charon", Name: "Charon"},
-	{VoiceID: "Kore", Name: "Kore"},
-	{VoiceID: "Fenrir", Name: "Fenrir"},
-	{VoiceID: "Leda", Name: "Leda"},
-	{VoiceID: "Orus", Name: "Orus"},
-	{VoiceID: "Aoede", Name: "Aoede"},
-	{VoiceID: "Callirrhoe", Name: "Callirrhoe"},
-	{VoiceID: "Autonoe", Name: "Autonoe"},
-	{VoiceID: "Enceladus", Name: "Enceladus"},
-	{VoiceID: "Iapetus", Name: "Iapetus"},
-	{VoiceID: "Umbriel", Name: "Umbriel"},
-	{VoiceID: "Algieba", Name: "Algieba"},
-	{VoiceID: "Despina", Name: "Despina"},
-	{VoiceID: "Erinome", Name: "Erinome"},
-	{VoiceID: "Algenib", Name: "Algenib"},
-	{VoiceID: "Rasalgethi", Name: "Rasalgethi"},
-	{VoiceID: "Laomedeia", Name: "Laomedeia"},
-	{VoiceID: "Achernar", Name: "Achernar"},
-	{VoiceID: "Alnilam", Name: "Alnilam"},
-	{VoiceID: "Schedar", Name: "Schedar"},
-	{VoiceID: "Gacrux", Name: "Gacrux"},
-	{VoiceID: "Pulcherrima", Name: "Pulcherrima"},
-	{VoiceID: "Achird", Name: "Achird"},
-	{VoiceID: "Zubenelgenubi", Name: "Zubenelgenubi"},
-	{VoiceID: "Vindemiatrix", Name: "Vindemiatrix"},
-	{VoiceID: "Sadachbia", Name: "Sadachbia"},
-	{VoiceID: "Sadaltager", Name: "Sadaltager"},
-	{VoiceID: "Sulafat", Name: "Sulafat"},
+	{VoiceID: "Zephyr", Name: "Zephyr", Labels: styleLabel("Bright")},
+	{VoiceID: "Puck", Name: "Puck", Labels: styleLabel("Upbeat")},
+	{VoiceID: "Charon", Name: "Charon", Labels: styleLabel("Informative")},
+	{VoiceID: "Kore", Name: "Kore", Labels: styleLabel("Firm")},
+	{VoiceID: "Fenrir", Name: "Fenrir", Labels: styleLabel("Excitable")},
+	{VoiceID: "Leda", Name: "Leda", Labels: styleLabel("Youthful")},
+	{VoiceID: "Orus", Name: "Orus", Labels: styleLabel("Firm")},
+	{VoiceID: "Aoede", Name: "Aoede", Labels: styleLabel("Breezy")},
+	{VoiceID: "Callirrhoe", Name: "Callirrhoe", Labels: styleLabel("Easy-going")},
+	{VoiceID: "Autonoe", Name: "Autonoe", Labels: styleLabel("Bright")},
+	{VoiceID: "Enceladus", Name: "Enceladus", Labels: styleLabel("Breathy")},
+	{VoiceID: "Iapetus", Name: "Iapetus", Labels: styleLabel("Clear")},
+	{VoiceID: "Umbriel", Name: "Umbriel", Labels: styleLabel("Easy-going")},
+	{VoiceID: "Algieba", Name: "Algieba", Labels: styleLabel("Smooth")},
+	{VoiceID: "Despina", Name: "Despina", Labels: styleLabel("Smooth")},
+	{VoiceID: "Erinome", Name: "Erinome", Labels: styleLabel("Clear")},
+	{VoiceID: "Algenib", Name: "Algenib", Labels: styleLabel("Gravelly")},
+	{VoiceID: "Rasalgethi", Name: "Rasalgethi", Labels: styleLabel("Informative")},
+	{VoiceID: "Laomedeia", Name: "Laomedeia", Labels: styleLabel("Upbeat")},
+	{VoiceID: "Achernar", Name: "Achernar", Labels: styleLabel("Soft")},
+	{VoiceID: "Alnilam", Name: "Alnilam", Labels: styleLabel("Firm")},
+	{VoiceID: "Schedar", Name: "Schedar", Labels: styleLabel("Even")},
+	{VoiceID: "Gacrux", Name: "Gacrux", Labels: styleLabel("Mature")},
+	{VoiceID: "Pulcherrima", Name: "Pulcherrima", Labels: styleLabel("Forward")},
+	{VoiceID: "Achird", Name: "Achird", Labels: styleLabel("Friendly")},
+	{VoiceID: "Zubenelgenubi", Name: "Zubenelgenubi", Labels: styleLabel("Casual")},
+	{VoiceID: "Vindemiatrix", Name: "Vindemiatrix", Labels: styleLabel("Gentle")},
+	{VoiceID: "Sadachbia", Name: "Sadachbia", Labels: styleLabel("Lively")},
+	{VoiceID: "Sadaltager", Name: "Sadaltager", Labels: styleLabel("Knowledgeable")},
+	{VoiceID: "Sulafat", Name: "Sulafat", Labels: styleLabel("Warm")},
 }
 
 // defaultVoice is the voice used when none is specified.

internal/audio/types_capabilities.go

@@ -38,11 +38,16 @@ type Dependency struct {
 }
 
 // VoiceOption is a static voice entry exposed in ProviderCapabilities.
+//
+// Labels carries provider-specific descriptors (e.g. {"style": "Bright"} for
+// Gemini, {"gender": "female", "accent": "american"} for ElevenLabs). Frontend
+// renders the first 1–2 entries as badges next to the voice name.
 type VoiceOption struct {
-	VoiceID  string `json:"voice_id"`
-	Name     string `json:"name"`
-	Language string `json:"language,omitempty"`
-	Gender   string `json:"gender,omitempty"`
+	VoiceID  string            `json:"voice_id"`
+	Name     string            `json:"name"`
+	Language string            `json:"language,omitempty"`
+	Gender   string            `json:"gender,omitempty"`
+	Labels   map[string]string `json:"labels,omitempty"`
 }
 
 // ParamSchema describes a single configurable parameter for a TTS provider.

ui/desktop/frontend/src/api/tts-capabilities.ts

@@ -50,6 +50,8 @@ export interface VoiceOption {
   name: string;
   language?: string;
   gender?: string;
+  /** Provider-specific descriptors (e.g. {style: "Bright"} for Gemini). */
+  labels?: Record<string, string>;
 }
 
 export interface ProviderCapabilities {

ui/desktop/frontend/src/components/agents/voice-picker.tsx

@@ -37,13 +37,13 @@ export interface PortalVoice {
   preview_url?: string
 }
 
-/** Maps a capability VoiceOption to PortalVoice (no labels/preview for Gemini). */
+/** Maps a capability VoiceOption to PortalVoice. Labels passed through (e.g. Gemini style). */
 function mapCapVoiceToPortal(v: VoiceOption): PortalVoice {
-  return { voice_id: v.voice_id, name: v.name }
+  return { voice_id: v.voice_id, name: v.name, labels: v.labels }
 }
 
 function VoiceOption({ voice, selected }: { voice: PortalVoice; selected: boolean }) {
-  const labelEntries = ['gender', 'accent', 'age', 'use_case']
+  const labelEntries = ['gender', 'accent', 'age', 'use_case', 'style']
     .filter((k) => voice.labels?.[k])
     .map((k) => voice.labels![k])
 

ui/web/src/api/tts-capabilities.ts

@@ -51,6 +51,8 @@ export interface VoiceOption {
   name: string;
   language?: string;
   gender?: string;
+  /** Provider-specific descriptors (e.g. {style: "Bright"} for Gemini). */
+  labels?: Record<string, string>;
 }
 
 export interface ProviderCapabilities {

ui/web/src/components/voice-picker.tsx

@@ -46,7 +46,7 @@ interface Props {
   placeholder?: string;
 }
 
-const LABEL_KEYS = ["gender", "accent", "age", "use_case"] as const;
+const LABEL_KEYS = ["gender", "accent", "age", "use_case", "style"] as const;
 
 /**
  * Unified voice shape for PortalVoicePicker.
@@ -59,9 +59,9 @@ export interface PortalVoice {
   preview_url?: string;
 }
 
-/** Maps a capability VoiceOption to PortalVoice (labels/preview absent for Gemini). */
+/** Maps a capability VoiceOption to PortalVoice. Labels passed through (e.g. Gemini style). */
 function mapCapVoiceToPortal(v: VoiceOption): PortalVoice {
-  return { voice_id: v.voice_id, name: v.name };
+  return { voice_id: v.voice_id, name: v.name, labels: v.labels };
 }
 
 function VoiceRow({ voice, selected, onSelect }: { voice: PortalVoice; selected: boolean; onSelect: () => void }) {