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/pages/BotProfilePage.vue

@@ -285,7 +285,7 @@ onMounted(async () => {
   if (stats.value?.ownerPubkey) {
     fetchNostrProfile(stats.value.ownerPubkey).then(p => {
       nostrProfile.value = p
-    }).catch(() => {})
+    }).catch(err => console.warn('[BotProfile] webhook test failed:', err))
   }
 
   // Poll queue for "choose your fight"

frontend/src/pages/FightPage.vue

@@ -224,12 +224,12 @@ function wireSSE() {
     },
     onRoundEnd(data) {
       if (_fightEnding) return // Don't start new round animations after fight is ending
-      _roundEndPromise = handleRoundEnd(data).catch(() => {})
+      _roundEndPromise = handleRoundEnd(data).catch(err => console.warn('[FightPage] handleRoundEnd failed:', err))
     },
     onFightEnd(data) {
       if (_fightEnding) return // Deduplicate (only process first fight_end)
       _fightEnding = true
-      handleFightEnd(data).catch(() => {})
+      handleFightEnd(data).catch(err => console.warn('[FightPage] handleFightEnd failed:', err))
     },
   })
 }
@@ -517,7 +517,7 @@ onMounted(async () => {
 
   // Cache finished fights for offline replay
   if (status === 'finished' && fight.value) {
-    cacheFight(fight.value).catch(() => {})
+    cacheFight(fight.value).catch(err => console.warn('[FightPage] cacheFight failed:', err))
   }
 
   isLoading.value = false