fix: add delay after AudioContext resume and schedule offset

frontend/src/App.svelte

@@ -124,6 +124,8 @@
       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()
@@ -134,11 +136,13 @@
       oscillator.frequency.value = frequency
       oscillator.type = type
       
-      gainNode.gain.setValueAtTime(0.3, ctx.currentTime)
-      gainNode.gain.exponentialRampToValueAtTime(0.01, ctx.currentTime + duration)
+      // 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)
       
-      oscillator.start(ctx.currentTime)
-      oscillator.stop(ctx.currentTime + duration)
+      oscillator.start(startTime)
+      oscillator.stop(startTime + duration)
     } catch (e) {
       console.error('Failed to play sound:', e)
     }
@@ -166,7 +170,13 @@
     }
   }
 
-  function handleMeetingStarted() {
+  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()
+    }
     meetingActive = true
     currentView = 'main'
   }