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/include/ai_chat.php

@@ -1440,7 +1440,7 @@ vv_ai_profiles_script();
       fetch(API, { method: 'POST', headers: POST_HEAD,
                    body: new URLSearchParams({ action: 'stop', token: t }) })
         .then(r => r.json())
-        .catch(() => {});
+        .catch(e => vvFetchErr('stop generation', e));
       // Nothing is rendered from the response. The poll already owns turning a terminal state into
       // a message, and having two paths do it is how a turn ends up in the transcript twice.
     }
@@ -1465,7 +1465,7 @@ vv_ai_profiles_script();
             noteLine('Stopped before anything was written.');
           }
           fetch(API, { method: 'POST', headers: POST_HEAD,
-            body: new URLSearchParams({ action: 'clear', token }) }).catch(() => {});
+            body: new URLSearchParams({ action: 'clear', token }) }).catch(e => vvFetchErr('clear job', e));
           finish();
           save();
           return;
@@ -1475,7 +1475,7 @@ vv_ai_profiles_script();
           addAnswer(j);
           messages.push({ role: 'assistant', content: j.answer });
           fetch(API, { method: 'POST', headers: POST_HEAD,
-            body: new URLSearchParams({ action: 'clear', token }) }).catch(() => {});
+            body: new URLSearchParams({ action: 'clear', token }) }).catch(e => vvFetchErr('clear job', e));
           finish();
           save();
           // The answer is passed so a page can react to what was said, not just that a turn
@@ -1519,7 +1519,7 @@ vv_ai_profiles_script();
         }) })
         .then(r => r.json())
         .then(d => { if (d.ok) { chatId = d.id; onChats(chatId); } })
-        .catch(() => {});
+        .catch(e => vvFetchErr('save conversation', e));
     }
 
 
@@ -2121,7 +2121,7 @@ vv_ai_profiles_script();
 
         const last = pool.slice().sort((a, b) => (b.updated || 0) - (a.updated || 0))[0];
         if (last) loadChat(last.id);
-      }).catch(() => {});
+      }).catch(e => vvFetchErr('resume conversation', e));
     }
 
     const inst = {
@@ -2305,7 +2305,7 @@ vv_ai_profiles_script();
     function load() {
       fetch(API + '?action=chats').then(r => r.json())
         .then(d => { if (d.ok) { rows = d.chats || []; render(); } })
-        .catch(() => {});
+        .catch(e => vvFetchErr('conversation list', e));
     }
 
     box.addEventListener('click', e => {
@@ -2328,7 +2328,7 @@ vv_ai_profiles_script();
             // from the store, which would silently resurrect it on the next turn.
             if (del.dataset.del === activeId && o.chat) o.chat.newChat();
             load();
-          }).catch(() => {});
+          }).catch(e => vvFetchErr('delete conversation', e));
         return;
       }
       const row = e.target.closest('.vv-ai-crow');