voice: quieter thinking tone, log cleanup, and small ui polish

- Add scripts/lower-thinking-tone.mjs to scale the thinking-tone PCM
  amplitude in-place; apply it at 0.1 so the cue is a soft indicator
  instead of triggering the VAD via mic feedback.
- Drop the "Received first voice_audio_chunk" log that re-fires every
  summary window because the chunk counter is reset.
- Match Spoke message icon and label sizing to the standard tool-call
  badge.
- Append a spoken-input instruction so voice replies route through the
  speak tool.

packages/app/scripts/lower-thinking-tone.mjs

@@ -0,0 +1,57 @@
+#!/usr/bin/env node
+// Scale the amplitude of the thinking-tone PCM16 base64 in-place.
+// Usage: node scripts/lower-thinking-tone.mjs <gain>
+// Example: node scripts/lower-thinking-tone.mjs 0.3   (≈ -10 dB)
+
+import { readFileSync, writeFileSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import { dirname, resolve } from "node:path";
+
+const here = dirname(fileURLToPath(import.meta.url));
+const target = resolve(here, "../src/utils/thinking-tone.native-pcm.ts");
+
+const gainArg = process.argv[2];
+if (!gainArg) {
+  console.error("Usage: node scripts/lower-thinking-tone.mjs <gain>");
+  process.exit(1);
+}
+const gain = Number(gainArg);
+if (!Number.isFinite(gain) || gain < 0) {
+  console.error(`Invalid gain: ${gainArg}`);
+  process.exit(1);
+}
+
+const source = readFileSync(target, "utf8");
+const match = source.match(/"([A-Za-z0-9+/=]+)"/);
+if (!match) {
+  console.error("Could not find base64 string in target file.");
+  process.exit(1);
+}
+const originalBase64 = match[1];
+
+const buf = Buffer.from(originalBase64, "base64");
+if (buf.byteLength % 2 !== 0) {
+  console.error(`PCM16 buffer has odd length ${buf.byteLength}`);
+  process.exit(1);
+}
+
+let peakBefore = 0;
+let peakAfter = 0;
+const out = Buffer.alloc(buf.byteLength);
+for (let i = 0; i < buf.byteLength; i += 2) {
+  const sample = buf.readInt16LE(i);
+  peakBefore = Math.max(peakBefore, Math.abs(sample));
+  const scaled = Math.max(-32768, Math.min(32767, Math.round(sample * gain)));
+  peakAfter = Math.max(peakAfter, Math.abs(scaled));
+  out.writeInt16LE(scaled, i);
+}
+
+const newBase64 = out.toString("base64");
+const updated = source.replace(originalBase64, newBase64);
+writeFileSync(target, updated);
+
+console.log(`Scaled thinking tone by ${gain}.`);
+console.log(`  samples:   ${buf.byteLength / 2}`);
+console.log(`  peak abs:  ${peakBefore} -> ${peakAfter}`);
+console.log(`  base64 len ${originalBase64.length} -> ${newBase64.length}`);
+console.log(`  wrote ${target}`);

packages/app/src/components/message.tsx

@@ -1740,8 +1740,8 @@ const speakMessageStylesheet = StyleSheet.create((theme) => ({
   },
   headerLabel: {
     fontFamily: Fonts.sans,
-    fontSize: 12,
-    fontWeight: "500",
+    fontSize: theme.fontSize.base,
+    fontWeight: theme.fontWeight.normal,
     color: theme.colors.foregroundMuted,
   },
   text: {
@@ -1769,7 +1769,7 @@ export const SpeakMessage = memo(function SpeakMessage({
   return (
     <View testID="speak-message" style={containerStyle}>
       <View style={speakMessageStylesheet.header}>
-        <ThemedMicVocal size={14} uniProps={foregroundMutedColorMapping} />
+        <ThemedMicVocal size={12} uniProps={foregroundMutedColorMapping} />
         <Text style={speakMessageStylesheet.headerLabel}>Spoke</Text>
       </View>
       <Text style={speakMessageStylesheet.text}>{message}</Text>

packages/server/src/server/session.ts

@@ -7546,15 +7546,6 @@ export class Session {
     const chunkBytes = Buffer.byteLength(msg.audio, "base64");
     this.voiceInputChunkCount += 1;
     this.voiceInputBytes += chunkBytes;
-    if (this.voiceInputChunkCount === 1) {
-      this.sessionLogger.info(
-        {
-          format: chunkFormat,
-          audioBytes: chunkBytes,
-        },
-        "Received first voice_audio_chunk for active voice mode",
-      );
-    }
     const now = Date.now();
     if (this.voiceInputChunkCount % 50 === 0 || now - this.voiceInputWindowStartedAt >= 1000) {
       this.sessionLogger.info(

packages/server/src/server/voice-config.ts

@@ -54,7 +54,7 @@ export function buildVoiceModeSystemPrompt(existing: string | undefined, enabled
 }
 
 export function wrapSpokenInput(text: string): string {
-  return `<spoken-input>\n${text}\n</spoken-input>`;
+  return `<spoken-input>\n${text}\n</spoken-input>\n<instruction>This message was spoken by the user. Respond using the speak tool only, not normal messages, because the user may not be looking at the chat.</instruction>`;
 }
 
 export function buildVoiceAgentMcpServerConfig(params: {