fix(tui): clear TTS env var on voice off, and add TTS indicator to status bar

Bug 1: /voice off in TUI mode did not clear HERMES_VOICE_TTS,
leaving TTS stuck ON with no way to disable it (the voice.toggle
tts handler requires voice mode to be ON).

Bug 2: TUI status bar only showed 'voice on/off' without any
indication of whether TTS speech output is active, because the
frontend never tracked voiceTts state.

- tui_gateway/server.py: clear HERMES_VOICE_TTS when voice is turned off
- ui-tui/src/app/useMainApp.ts: add voiceTts state, thread setVoiceTts
  through voice contexts, display [tts] in status bar
- ui-tui/src/app/slash/commands/session.ts: sync tts from voice.toggle response
- ui-tui/src/app/interfaces.ts: add setVoiceTts to all voice context interfaces

ui-tui/src/app/interfaces.ts

@@ -216,6 +216,7 @@ export interface InputHandlerContext {
     setProcessing: StateSetter<boolean>
     setRecording: StateSetter<boolean>
     setVoiceEnabled: StateSetter<boolean>
+    setVoiceTts: StateSetter<boolean>
   }
   wheelStep: number
 }
@@ -254,6 +255,7 @@ export interface GatewayEventHandlerContext {
     setProcessing: StateSetter<boolean>
     setRecording: StateSetter<boolean>
     setVoiceEnabled: StateSetter<boolean>
+    setVoiceTts: StateSetter<boolean>
   }
 }
 
@@ -296,6 +298,7 @@ export interface SlashHandlerContext {
   voice: {
     setVoiceEnabled: StateSetter<boolean>
     setVoiceRecordKey: (v: ParsedVoiceRecordKey) => void
+    setVoiceTts: StateSetter<boolean>
   }
 }
 

ui-tui/src/app/slash/commands/session.ts

@@ -232,6 +232,7 @@ export const sessionCommands: SlashCommand[] = [
       ctx.gateway.rpc<VoiceToggleResponse>('voice.toggle', { action }).then(
         ctx.guarded<VoiceToggleResponse>(r => {
           ctx.voice.setVoiceEnabled(!!r.enabled)
+          ctx.voice.setVoiceTts(!!r.tts)
 
           // Render the configured record key (config.yaml ``voice.record_key``)
           // instead of hardcoded "Ctrl+B" — the gateway response carries the

ui-tui/src/app/useMainApp.ts

@@ -102,6 +102,7 @@ export function useMainApp(gw: GatewayClient) {
   const [stickyPrompt, setStickyPrompt] = useState('')
   const [catalog, setCatalog] = useState<null | SlashCatalog>(null)
   const [voiceEnabled, setVoiceEnabled] = useState(false)
+  const [voiceTts, setVoiceTts] = useState(false)
   const [voiceRecording, setVoiceRecording] = useState(false)
   const [voiceProcessing, setVoiceProcessing] = useState(false)
   const [voiceRecordKey, setVoiceRecordKey] = useState<ParsedVoiceRecordKey>(DEFAULT_VOICE_RECORD_KEY)
@@ -555,7 +556,8 @@ export function useMainApp(gw: GatewayClient) {
       recording: voiceRecording,
       setProcessing: setVoiceProcessing,
       setRecording: setVoiceRecording,
-      setVoiceEnabled
+      setVoiceEnabled,
+      setVoiceTts
     },
     wheelStep: WHEEL_SCROLL_STEP
   })
@@ -579,7 +581,8 @@ export function useMainApp(gw: GatewayClient) {
         voice: {
           setProcessing: setVoiceProcessing,
           setRecording: setVoiceRecording,
-          setVoiceEnabled
+          setVoiceEnabled,
+          setVoiceTts
         }
       }),
     [
@@ -830,7 +833,7 @@ export function useMainApp(gw: GatewayClient) {
       turnStartedAt: ui.sid ? turnStartedAt : null,
       // CLI parity: the classic prompt_toolkit status bar shows a red dot
       // on REC (cli.py:_get_voice_status_fragments line 2344).
-      voiceLabel: voiceRecording ? '● REC' : voiceProcessing ? '◉ STT' : `voice ${voiceEnabled ? 'on' : 'off'}`
+      voiceLabel: voiceRecording ? '● REC' : voiceProcessing ? '◉ STT' : `voice ${voiceEnabled ? 'on' : 'off'}${voiceTts ? ' [tts]' : ''}`
     }),
     [
       cwd,
@@ -842,7 +845,8 @@ export function useMainApp(gw: GatewayClient) {
       ui,
       voiceEnabled,
       voiceProcessing,
-      voiceRecording
+      voiceRecording,
+      voiceTts
     ]
   )