fix(chat): Expand user chat bubble edit textbox width (#3963)

* fix(chat): Expand user chat bubble edit textbox width

- Update user chat bubble width from `fit-content` to `85%` to ensure consistency with the AI chat bubble edit textbox width.

* style(chat): Refine user message bubble width logic

- Change general bubble width to `fit-content`
- Set width to 85% specifically for user messages containing a `textarea`

static/style.css

@@ -2070,6 +2070,9 @@ body.bg-pattern-sparkles {
       overflow-wrap: break-word;
       overflow: hidden;
     }
+    .msg-user:has(textarea) {
+      width: 85%;
+    }
     .msg-ai {
       align-items: flex-start;
       margin-right: auto;