Add sound effects with a 🔊 mute button

[Necromancervbh]

FlowForge now sounds like a game. All sounds are synthesized with Web Audio in the new public/sound.js, so there are no audio files to download.

Event	Sound
A combo run finishes	🪙 a two-note coin "ka-ching"
A combo fails	a low "bwomp"
A combo levels up	a quick rising pair
An achievement or daily quest is completed	a 4-note arpeggio
The player levels up	a 5-note fanfare

• The 🔊 / 🔇 button in the header mutes sound and remembers the choice in localStorage. Unmuting plays a coin as a preview.
• Browsers block audio until the first click or key press, so the audio context starts on that first gesture.
• Run sounds are rate-limited to one per 250 ms, so ten files landing at once don't sound like a machine gun.
• Volume is kept low (0.08) with quick fade-outs.

Tested in the browser by counting the oscillators started. One real ▶ Play click on a save at 90 XP played the achievement arpeggio twice ("It Lives" and the "Press Play" quest), then the level-2 fanfare, then the coin. Mute and unmute persist across a reload, and the console has no errors. npm test passes 48 tests.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Wm8TE3zwYDLddBccTdRBqf

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Generated by Claude Code

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Run ID: c240c155-ddb1-4ba6-a9e7-33d32e2a47d2

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