fix: add background color for chat bubble in light and dark themes (#22472)

web/app/components/base/chat/chat/question.tsx

               />
             )
           }
-          { !isEditing
+          {!isEditing
             ? <Markdown content={content} />
             : <div className="
                 flex flex-col gap-2 rounded-xl
                 <Button variant='ghost' onClick={handleCancelEditing}>{t('common.operation.cancel')}</Button>
                 <Button variant='primary' onClick={handleResend}>{t('common.chat.resend')}</Button>
               </div>
-            </div> }
-          { !isEditing && <ContentSwitch
+            </div>}
+          {!isEditing && <ContentSwitch
             count={item.siblingCount}
             currentIndex={item.siblingIndex}
             prevDisabled={!item.prevSibling}

web/tailwind-common-config.ts

       fontSize: {
         '2xs': '0.625rem',
       },
+      backgroundColor: {
+        'background-gradient-bg-fill-chat-bubble-bg-3': 'var(--color-background-gradient-bg-fill-chat-bubble-bg-3)',
+      },
       backgroundImage: {
         'chatbot-bg': 'var(--color-chatbot-bg)',
         'chat-bubble-bg': 'var(--color-chat-bubble-bg)',

web/themes/manual-dark.css

     --color-premium-badge-border-highlight-color: #ffffff33;
     --color-price-enterprise-background: linear-gradient(180deg, rgba(185, 211, 234, 0.00) 0%, rgba(180, 209, 234, 0.92) 100%);
     --color-grid-mask-background: linear-gradient(0deg, rgba(0, 0, 0, 0.00) 0%, rgba(24, 24, 25, 0.1) 62.25%, rgba(24, 24, 25, 0.10) 100%);
+    --color-background-gradient-bg-fill-chat-bubble-bg-3: #27314d;
 }

web/themes/manual-light.css

     --color-premium-badge-border-highlight-color: #fffffff2;
     --color-price-enterprise-background: linear-gradient(180deg, rgba(185, 211, 234, 0.00) 0%, rgba(180, 209, 234, 0.92) 100%);
     --color-grid-mask-background: linear-gradient(0deg, #FFF 0%, rgba(217, 217, 217, 0.10) 62.25%, rgba(217, 217, 217, 0.10) 100%);
+    --color-background-gradient-bg-fill-chat-bubble-bg-3: #e1effe;
 }