fix(web): disable markdown typewriter animation on initial render

Pass :typewriter="false" on the About page and bind
:typewriter="message.streaming" in chat so that history messages
render instantly while streaming output retains the fade-in effect.

apps/web/src/pages/about/index.vue

@@ -75,6 +75,7 @@
               <MarkdownRender
                 :content="checkResult.body"
                 :is-dark="isDark"
+                :typewriter="false"
                 custom-id="release-notes"
               />
             </div>

apps/web/src/pages/home/components/message-item.vue

@@ -117,6 +117,7 @@
               <MarkdownRender
                 :content="block.content"
                 :is-dark="isDark"
+                :typewriter="message.streaming"
                 custom-id="chat-msg"
               />
             </div>
@@ -205,6 +206,7 @@
             <MarkdownRender
               :content="block.content"
               :is-dark="isDark"
+              :typewriter="message.streaming"
               custom-id="chat-msg"
             />
           </div>