fix: resolve double scrollbar in file editor

- Change workspace-main overflow from auto to hidden to prevent nested scrolling
- Change file-editor-content overflow from auto to hidden
- Change code-block overflow from auto to visible
- Add flex display to workspace-main and file-editor-content for proper height distribution

Fixes double scrollbar issue in file editor workspace

apps/web/src/styles.css

@@ -926,9 +926,11 @@ a {
 
 .workspace-main {
   flex: 1;
-  overflow: auto;
+  overflow: hidden;
   padding: 1rem;
   background: var(--bg);
+  display: flex;
+  flex-direction: column;
 }
 
 /* File Tree */
@@ -1522,8 +1524,10 @@ a {
 
 .file-editor-content {
   flex: 1;
-  overflow: auto;
+  overflow: hidden;
   background: var(--bg);
+  display: flex;
+  flex-direction: column;
 }
 
 /* Syntax Highlighter */
@@ -1595,7 +1599,7 @@ a {
   flex: 1;
   margin: 0;
   padding: 1rem;
-  overflow: auto;
+  overflow: visible;
   background: transparent;
 }