fix(tui): break TTS→STT feedback loop + colorize REC badge

TTS feedback loop (hermes_cli/voice.py)

The VAD loop kept the microphone live while speak_text played the
agent's reply over the speakers, so the reply itself was picked up,
transcribed, and submitted — the agent then replied to its own echo
("Ha, looks like we're in a loop").

Ported cli.py:_voice_tts_done synchronisation:

- _tts_playing: threading.Event (initially set = "not playing").
- speak_text cancels the active recorder before opening the speakers,
  clears _tts_playing, and on exit waits 300 ms before re-starting the
  recorder — long enough for the OS audio device to settle so afplay
  and sounddevice don't race for it.
- _continuous_on_silence now waits on _tts_playing (up to 60 s) before
  re-arming the mic with another 300 ms gap, mirroring
  cli.py:10619-10621.  If the user flips voice off during the wait the
  loop exits cleanly instead of fighting for the device.

Without both halves the loop races: if the silence callback fires
before TTS starts it re-arms immediately; if TTS is already playing
the pause-and-resume path catches it.

Red REC badge (ui-tui appChrome + useMainApp)

Classic CLI (cli.py:_get_voice_status_fragments) renders "● REC" in
red and "◉ STT" in amber.  TUI was showing a dim "REC" with no dot,
making it hard to spot at a glance.  voiceLabel now emits the same
glyphs and appChrome colours them via t.color.error / t.color.warn,
falling back to dim for the idle label.

ui-tui/src/app/useMainApp.ts

@@ -716,7 +716,9 @@ export function useMainApp(gw: GatewayClient) {
       statusColor: statusColorOf(ui.status, ui.theme.color),
       stickyPrompt,
       turnStartedAt: ui.sid ? turnStartedAt : null,
-      voiceLabel: voiceRecording ? 'REC' : voiceProcessing ? 'STT' : `voice ${voiceEnabled ? 'on' : 'off'}`
+      // 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'}`
     }),
     [
       cwd,

ui-tui/src/components/appChrome.tsx

@@ -215,7 +215,20 @@ export function StatusRule({
             </Text>
           ) : null}
           <SpawnHud t={t} />
-          {voiceLabel ? <Text color={t.color.dim}> │ {voiceLabel}</Text> : null}
+          {voiceLabel ? (
+            <Text
+              color={
+                voiceLabel.startsWith('●')
+                  ? t.color.error
+                  : voiceLabel.startsWith('◉')
+                    ? t.color.warn
+                    : t.color.dim
+              }
+            >
+              {' │ '}
+              {voiceLabel}
+            </Text>
+          ) : null}
           {bgCount > 0 ? <Text color={t.color.dim}> │ {bgCount} bg</Text> : null}
           {showCost && typeof usage.cost_usd === 'number' ? (
             <Text color={t.color.dim}> │ ${usage.cost_usd.toFixed(4)}</Text>