fix: warm up AudioContext on first click, clean up code

frontend/src/App.svelte

@@ -35,6 +35,27 @@
     EventsOn('timer:meeting_warning', handleMeetingWarning)
     EventsOn('timer:meeting_ended', handleMeetingEnded)
     EventsOn('timer:speaker_changed', handleSpeakerChanged)
+    
+    // Warm up AudioContext on first user interaction
+    const warmUpAudio = async () => {
+      const ctx = getAudioContext()
+      if (ctx.state === 'suspended') {
+        await ctx.resume()
+      }
+      // Play silent sound to fully unlock audio
+      const oscillator = ctx.createOscillator()
+      const gainNode = ctx.createGain()
+      oscillator.connect(gainNode)
+      gainNode.connect(ctx.destination)
+      gainNode.gain.value = 0 // Silent
+      oscillator.start()
+      oscillator.stop(ctx.currentTime + 0.001)
+      // Remove listener after first interaction
+      document.removeEventListener('click', warmUpAudio)
+      document.removeEventListener('keydown', warmUpAudio)
+    }
+    document.addEventListener('click', warmUpAudio)
+    document.addEventListener('keydown', warmUpAudio)
   })
 
   async function loadSettings() {
@@ -119,14 +140,9 @@
     return audioContext
   }
 
-  async function playBeep(frequency, duration, type = 'sine') {
+  function playBeep(frequency, duration, type = 'sine') {
     try {
       const ctx = getAudioContext()
-      if (ctx.state === 'suspended') {
-        await ctx.resume()
-        // Wait a frame for currentTime to update after resume
-        await new Promise(resolve => setTimeout(resolve, 50))
-      }
       const oscillator = ctx.createOscillator()
       const gainNode = ctx.createGain()
       
@@ -136,47 +152,36 @@
       oscillator.frequency.value = frequency
       oscillator.type = type
       
-      // Use small offset to ensure sound is scheduled in the future
-      const startTime = ctx.currentTime + 0.01
-      gainNode.gain.setValueAtTime(0.3, startTime)
-      gainNode.gain.exponentialRampToValueAtTime(0.01, startTime + duration)
+      gainNode.gain.setValueAtTime(0.3, ctx.currentTime)
+      gainNode.gain.exponentialRampToValueAtTime(0.01, ctx.currentTime + duration)
       
-      oscillator.start(startTime)
-      oscillator.stop(startTime + duration)
+      oscillator.start(ctx.currentTime)
+      oscillator.stop(ctx.currentTime + duration)
     } catch (e) {
       console.error('Failed to play sound:', e)
     }
   }
 
-  async function playSound(name) {
+  function playSound(name) {
     switch (name) {
       case 'warning':
-        // Two short warning beeps
-        await playBeep(880, 0.15)
+        playBeep(880, 0.15)
         setTimeout(() => playBeep(880, 0.15), 200)
         break
       case 'timeup':
-        // Descending tone sequence
-        await playBeep(1200, 0.2)
+        playBeep(1200, 0.2)
         setTimeout(() => playBeep(900, 0.2), 250)
         setTimeout(() => playBeep(600, 0.3), 500)
         break
       case 'meeting_end':
-        // Final chime - three notes
-        await playBeep(523, 0.2)  // C5
-        setTimeout(() => playBeep(659, 0.2), 200)  // E5
-        setTimeout(() => playBeep(784, 0.4), 400)  // G5
+        playBeep(523, 0.2)
+        setTimeout(() => playBeep(659, 0.2), 200)
+        setTimeout(() => playBeep(784, 0.4), 400)
         break
     }
   }
 
-  async function handleMeetingStarted() {
-    // Pre-initialize AudioContext on user gesture (meeting start click)
-    // This is required because AudioContext can only be resumed during user interaction
-    const ctx = getAudioContext()
-    if (ctx.state === 'suspended') {
-      await ctx.resume()
-    }
+  function handleMeetingStarted() {
     meetingActive = true
     currentView = 'main'
   }