Report every failed fetch instead of discarding it

Twenty-four fetch chains ended in an empty catch, which is not error handling
but error deletion: the request fails, nothing renders, nothing is logged, and
the surface sits on Loading forever. That is how the mesh chat's ReferenceError
read as a slow load for as long as it did.

Plugin/unraid/pages/ai.php

@@ -618,7 +618,7 @@ vv_ai_chat_markup('vv-ai', [
   function loadBanner(live) {
     fetch(API + '?action=stats' + (live ? '&live=1' : '')).then(r => r.json())
       .then(d => { if (d.ok) renderBanner(d.stats); })
-      .catch(() => {});
+      .catch(e => vvFetchErr('AI banner', e));
   }
 
   // ── Bug reports ─────────────────────────────────────────────────────────
@@ -628,7 +628,7 @@ vv_ai_chat_markup('vv-ai', [
   function loadBugs() {
     fetch(API + '?action=bugs').then(r => r.json())
       .then(d => { if (d.ok) renderBugs(d.bugs || []); })
-      .catch(() => {});
+      .catch(e => vvFetchErr('AI bug list', e));
   }
 
   function renderBugs(bugs) {
@@ -750,7 +750,7 @@ vv_ai_chat_markup('vv-ai', [
     fetch(API, { method: 'POST',
       headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
       body: new URLSearchParams({ action: 'bug_close', id, open: '0' }) })
-      .then(() => loadBugs()).catch(() => {});
+      .then(() => loadBugs()).catch(e => vvFetchErr('AI bug report', e));
   };
 
   // ── Findings & proposals ────────────────────────────────────────────────
@@ -1108,7 +1108,7 @@ vv_ai_chat_markup('vv-ai', [
   function loadTokens() {
     fetch(API + '?action=tokens').then(r => r.json())
       .then(d => { if (d.ok) { tokData = d.tokens; renderTokens(); } })
-      .catch(() => {});
+      .catch(e => vvFetchErr('AI token ledger', e));
   }
 
   function renderTokens() {