fix: replace all silent .catch(() => {}) with console.warn (BUG-F2)

13 silent catch handlers replaced with descriptive console.warn logging
across 6 frontend files. No silent error swallowing remains.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/game/audio/context.ts

@@ -29,7 +29,7 @@ export function initCtx() {
 export function getCtx(): AudioContext {
   if (!ctx) initCtx()
   if (ctx!.state === 'suspended') {
-    ctx!.resume().catch(() => {})
+    ctx!.resume().catch(err => console.warn('[Audio] context resume failed:', err))
   }
   return ctx!
 }

frontend/src/game/tts.ts

@@ -239,7 +239,7 @@ const _inflight = new Map<string, Promise<AudioBuffer | null>>()
 
 function getAudioCtx(): AudioContext {
   if (!_audioCtx) _audioCtx = new AudioContext()
-  if (_audioCtx.state === 'suspended') _audioCtx.resume().catch(() => {})
+  if (_audioCtx.state === 'suspended') _audioCtx.resume().catch(err => console.warn('[TTS] AudioContext resume failed:', err))
   return _audioCtx
 }
 
@@ -505,7 +505,7 @@ export function kokoroSpeak(
   if (staticUrl || _workerReady) {
     _generateAndCache(text, profileName).then(buf => {
       if (buf) _playBuffer(buf, dest, volume)
-    }).catch(() => {})
+    }).catch(err => console.warn('[TTS] cache generation failed:', err))
     return true
   }
   return false
@@ -514,7 +514,7 @@ export function kokoroSpeak(
 /** Pre-generate audio in the worker so it's cached when needed. Fire-and-forget. */
 export function kokoroPrefetch(text: string, profileName: string): void {
   if (!_workerReady) return
-  _generateAndCache(text, profileName).catch(() => {})
+  _generateAndCache(text, profileName).catch(err => console.warn('[TTS] pre-cache generation failed:', err))
 }
 
 /** Await until prefetched audio is cached and ready (max 2s). Returns true if cached, false on timeout/failure. */