Notification sounds: hand-picked mp3 palette + error/milestone cues

Replace the synthesized WAV blips with curated mp3 effects:
- error ("haiya") plays on LLM-down/timeout and save failures, debounced
  and on-transition-only, with a reassuring bilingual bubble
- milestone (Chinese fanfare) now fires every 100 words
- all other notifications draw from a rotating pop pool that never repeats
  the last sound, so batches of suggestions/tips stay lively

playPop() replaces the per-suggestion-type sound map; thread llmDown through
PetalCompanion -> useCompanion for the error cue. Old synth WAVs removed.

Claude-Session: https://claude.ai/code/session_016Yr6jELuRc7hyzYLccQKZd

web/src/App.tsx

@@ -475,6 +475,7 @@ export default function App() {
         <PetalCompanion
           wordCount={wordCount}
           saveStatus={status}
+          llmDown={llmDown}
           editTick={editTick}
           acceptTick={acceptTick}
           text={docText}

web/src/audio/sounds.ts

@@ -1,16 +1,18 @@
-// Petal's cute sound palette. The actual tones live as tiny WAV assets in
-// ./assets (generated by scripts/gen_sounds.py — warm bubble pops, water drops,
-// and soft bells tuned to match the app's gentle look). Vite fingerprints and
-// bundles them into dist, so they ride along inside the single Go binary; here
-// we just fetch + decode them once and play them through a Web Audio bus with a
-// soft master volume. The whole thing is opt-out-able and the mute choice
-// persists in localStorage so it survives reloads.
+// Petal's cute sound palette. These are hand-picked mp3 effects (warm bubble
+// pops, a wooden "tok", rolling baoding balls, a Chinese fanfare for milestones,
+// and a playful "haiya" for errors) living as assets in ./assets/sounds. Vite
+// fingerprints and bundles them into dist, so they ride along inside the single
+// Go binary; here we just fetch + decode them once and play them through a Web
+// Audio bus with a soft master volume. The whole thing is opt-out-able and the
+// mute choice persists in localStorage so it survives reloads.
 
-import popUrl from '../assets/sounds/pop.wav'
-import dropletUrl from '../assets/sounds/droplet.wav'
-import chimeUrl from '../assets/sounds/chime.wav'
-import shimmerUrl from '../assets/sounds/shimmer.wav'
-import cheerUrl from '../assets/sounds/cheer.wav'
+import pop1Url from '../assets/sounds/pop1.mp3'
+import pop2Url from '../assets/sounds/pop2.mp3'
+import tokUrl from '../assets/sounds/tok.mp3'
+import blockUrl from '../assets/sounds/block.mp3'
+import baodingUrl from '../assets/sounds/baoding.mp3'
+import milestoneUrl from '../assets/sounds/milestone.mp3'
+import errorUrl from '../assets/sounds/error.mp3'
 
 const STORAGE_KEY = 'petal.sound'
 
@@ -18,20 +20,32 @@ const STORAGE_KEY = 'petal.sound'
 const MASTER_GAIN = 0.5
 
 export type SoundName =
-  | 'pop' // a soft bubble pop — the signature "something arrived"
-  | 'droplet' // a single rounded water-drop ping
-  | 'chime' // a gentle two-note bell
-  | 'shimmer' // three quick ascending sparkles
-  | 'cheer' // a happy little major arpeggio (accepts, milestones)
+  | 'pop1' // a soft bubble pop
+  | 'pop2' // a second bubble pop, slightly different
+  | 'tok' // a light wooden "tok"
+  | 'block' // a quick Chinese wood-block tap
+  | 'baoding' // rolling baoding-ball shimmer
+  | 'milestone' // a happy Chinese fanfare (word-count milestones)
+  | 'error' // a playful "haiya" — something went wrong
 
 const SOURCES: Record<SoundName, string> = {
-  pop: popUrl,
-  droplet: dropletUrl,
-  chime: chimeUrl,
-  shimmer: shimmerUrl,
-  cheer: cheerUrl,
+  pop1: pop1Url,
+  pop2: pop2Url,
+  tok: tokUrl,
+  block: blockUrl,
+  baoding: baodingUrl,
+  milestone: milestoneUrl,
+  error: errorUrl,
 }
 
+// The pool of light "something happened" notification sounds. We rotate through
+// these (skipping the one just played) so the same blip never repeats back to
+// back — a batch of suggestions or a run of tips stays lively instead of
+// hammering one note. milestone/error are deliberately NOT in the pool: they're
+// reserved for their specific moments.
+const POP_POOL: SoundName[] = ['pop1', 'pop2', 'tok', 'block', 'baoding']
+let lastPop = -1
+
 let ctx: AudioContext | null = null
 let master: GainNode | null = null
 const buffers = new Map<SoundName, AudioBuffer>()
@@ -147,18 +161,24 @@ export function playSound(name: SoundName): void {
   })()
 }
 
-// Map an editor suggestion type to its sound, so each kind of help has its own
-// little voice (grammar pops like a bubble, idioms chime, etc.).
-const SUGGESTION_SOUND: Record<string, SoundName> = {
-  grammar: 'pop',
-  phrasing: 'droplet',
-  idiom: 'chime',
-  clarity: 'shimmer',
-  voice: 'droplet',
+// Play the next notification pop from the pool, never repeating the last one, so
+// consecutive blips always sound different. This is the everyday "something
+// arrived" voice for suggestions, tips, and gentle cheers.
+export function playPop(): void {
+  let i = lastPop
+  // Tiny pool, so a short scan to pick anything but the last is plenty.
+  for (let tries = 0; tries < POP_POOL.length && i === lastPop; tries++) {
+    i = Math.floor(Math.random() * POP_POOL.length)
+  }
+  lastPop = i
+  playSound(POP_POOL[i])
 }
 
-export function playSuggestionSound(type: string): void {
-  playSound(SUGGESTION_SOUND[type] ?? 'pop')
+// Each freshly-surfaced suggestion just gets a rotating pop — the variety comes
+// from the pool, not from the suggestion type, so a batch of same-type fixes
+// still sounds lively.
+export function playSuggestionSound(_type: string): void {
+  playPop()
 }
 
 // Unlock + warm audio on the first user gesture so the very first sound isn't

web/src/components/Companion/PetalCompanion.tsx

@@ -7,6 +7,7 @@ import { COMPANIONS, DEFAULT_COMPANION } from './companions'
 interface Props {
   wordCount: number
   saveStatus: SaveStatus
+  llmDown: boolean
   editTick: number
   acceptTick: number
   text: string
@@ -27,10 +28,11 @@ const STORAGE_KEY = 'petal.companion'
 // useCompanion and shows a Mandarin-first speech bubble for cheers, tips, and
 // break reminders. Clicking the mascot opens a picker to switch companions
 // (the choice persists in localStorage).
-export function PetalCompanion({ wordCount, saveStatus, editTick, acceptTick, text }: Props) {
+export function PetalCompanion({ wordCount, saveStatus, llmDown, editTick, acceptTick, text }: Props) {
   const { mood, bubble, dismiss, holdBubble, releaseBubble } = useCompanion({
     wordCount,
     saveStatus,
+    llmDown,
     editTick,
     acceptTick,
     text,

web/src/components/Companion/tips.ts

@@ -48,8 +48,16 @@ export const WELCOME_BACK: Line = {
   en: 'Welcome back ✨ let’s keep going!',
 }
 
-// Word-count milestones worth a little cheer.
-export const MILESTONES = [50, 100, 250, 500, 1000, 2000]
+// Gentle "haiya, something went wrong" lines — paired with the error sound when
+// the LLM is unreachable or a save fails. Never alarming, always reassuring.
+export const ERRORS: Line[] = [
+  { zh: '哎呀～出了点小问题，你的字都还在哦。', en: 'Oops — a little hiccup, but your words are safe.' },
+  { zh: '哎呀，我这边卡了一下，马上就好。', en: 'Haiya, I got stuck for a sec — back in a moment.' },
+  { zh: '别担心，等一下再试试看 🍵', en: "Don't worry — let's try again in a bit. 🍵" },
+]
+
+// Word-count milestones worth a little cheer — every 100 words, on up.
+export const MILESTONES = Array.from({ length: 100 }, (_, i) => (i + 1) * 100)
 
 export function milestoneLine(n: number): Line {
   return {

web/src/components/Companion/useCompanion.ts

@@ -3,6 +3,7 @@ import type { SaveStatus } from '../../hooks/useAutoSave'
 import {
   BREAKS,
   ENCOURAGEMENTS,
+  ERRORS,
   GREETING,
   MILESTONES,
   TIPS,
@@ -12,13 +13,13 @@ import {
   type Line,
 } from './tips'
 import { analyzeProse } from './prose'
-import { playSound } from '../../audio/sounds'
+import { playPop, playSound, type SoundName } from '../../audio/sounds'
 
 // The kitten's expression. Maps to a Lottie animation when assets are present,
 // otherwise to an emoji placeholder (see PetalCompanion).
 export type Mood = 'idle' | 'happy' | 'talking' | 'sleeping' | 'celebrate'
 
-export type BubbleTone = 'cheer' | 'tip' | 'break'
+export type BubbleTone = 'cheer' | 'tip' | 'break' | 'error'
 export interface Bubble extends Line {
   tone: BubbleTone
 }
@@ -26,6 +27,9 @@ export interface Bubble extends Line {
 interface Signals {
   wordCount: number
   saveStatus: SaveStatus
+  // True while the writing-assist LLM is unreachable (timeout / down). A
+  // false→true flip earns a gentle "haiya".
+  llmDown: boolean
   // Monotonic counters bumped by the app on each editor change / accepted
   // suggestion — lets the companion react without a full event bus.
   editTick: number
@@ -62,7 +66,7 @@ function readBubbleMs(b: Bubble): number {
 // useCompanion is the behavior engine: it watches writing signals and decides
 // when the kitten speaks, what mood it shows, and how to pace itself so the
 // companion feels alive without interrupting. UI-agnostic — returns state only.
-export function useCompanion({ wordCount, saveStatus, editTick, acceptTick, text }: Signals) {
+export function useCompanion({ wordCount, saveStatus, llmDown, editTick, acceptTick, text }: Signals) {
   const [mood, setMood] = useState<Mood>('idle')
   const [bubble, setBubble] = useState<Bubble | null>(null)
 
@@ -88,7 +92,8 @@ export function useCompanion({ wordCount, saveStatus, editTick, acceptTick, text
 
   // Show a bubble + talking mood, then settle back. `proactive` messages respect
   // the spacing floor; user-triggered ones (cheers) always go through.
-  const say = useCallback((b: Bubble, opts?: { proactive?: boolean; celebrate?: boolean }) => {
+  const say = useCallback(
+    (b: Bubble, opts?: { proactive?: boolean; celebrate?: boolean; sound?: SoundName }) => {
     const t = now()
     if (opts?.proactive) {
       if (bubble) return
@@ -96,11 +101,11 @@ export function useCompanion({ wordCount, saveStatus, editTick, acceptTick, text
       lastProactive.current = t
     }
     sleeping.current = false
-    // A soft sound to match the bubble's mood — celebrations cheer, gentle
-    // cheers sparkle, break nudges chime, and tips give a little bubble pop.
-    playSound(
-      opts?.celebrate ? 'cheer' : b.tone === 'cheer' ? 'shimmer' : b.tone === 'break' ? 'chime' : 'pop',
-    )
+    // A sound to match the bubble: callers can name a specific one (the milestone
+    // fanfare, the "haiya" on errors); everything else gets a rotating pop so the
+    // same blip never repeats back to back.
+    if (opts?.sound) playSound(opts.sound)
+    else playPop()
     setBubble(b)
     setMood(opts?.celebrate ? 'celebrate' : 'talking')
     clearTimeout(bubbleTimer.current)
@@ -196,11 +201,39 @@ export function useCompanion({ wordCount, saveStatus, editTick, acceptTick, text
       const n = MILESTONES[nextMilestone.current]
       nextMilestone.current += 1
       // Skip silently if we're just loading a long doc (no edits yet).
-      if (!firstEdit.current) say({ ...milestoneLine(n), tone: 'cheer' }, { celebrate: true })
+      if (!firstEdit.current)
+        say({ ...milestoneLine(n), tone: 'cheer' }, { celebrate: true, sound: 'milestone' })
     }
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [wordCount])
 
+  // Trouble — a save failed or the writing-assist LLM went unreachable. Play the
+  // playful "haiya" and reassure her, but never spam: at most one per gap, and
+  // only on the *transition* into trouble (not while it lingers).
+  const lastError = useRef(0)
+  const ERROR_GAP = 20_000
+  const wasLlmDown = useRef(false)
+  const haiya = useCallback(() => {
+    const t = now()
+    if (t - lastError.current < ERROR_GAP) {
+      playSound('error') // still acknowledge it, just without a fresh bubble
+      return
+    }
+    lastError.current = t
+    say({ ...pick(ERRORS), tone: 'error' }, { sound: 'error' })
+  }, [say])
+
+  useEffect(() => {
+    if (saveStatus === 'error') haiya()
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [saveStatus])
+
+  useEffect(() => {
+    if (llmDown && !wasLlmDown.current) haiya()
+    wasLlmDown.current = llmDown
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [llmDown])
+
   // Occasional gentle cheer on a successful save (kept rare so it isn't noise).
   useEffect(() => {
     if (saveStatus === 'saved' && Math.random() < 0.18) {

web/src/components/StatusBar/SoundToggle.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useState } from 'react'
-import { isSoundEnabled, onSoundEnabledChange, playSound, setSoundEnabled } from '../../audio/sounds'
+import { isSoundEnabled, onSoundEnabledChange, playPop, setSoundEnabled } from '../../audio/sounds'
 
 // A tiny mute toggle for Petal's cute sounds, tucked at the right of the status
 // bar. Bilingual tooltip (she reads Mandarin first), and a soft confirming pop
@@ -14,7 +14,7 @@ export function SoundToggle() {
     const next = !on
     setSoundEnabled(next)
     setOn(next)
-    if (next) playSound('pop') // a little hello when re-enabled
+    if (next) playPop() // a little hello when re-enabled
   }
 
   return (