Fix sidebar display and scrolling issues on smaller screens

Address several UI glitches including unreadable sidebar icons when collapsed, incorrect scrollbar placement, and a visual gap at the bottom of the sidebar by adjusting layout and container properties across multiple pages and components.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: cc8ba926-557c-4bf1-a2ea-ceabbcf38824
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/cc8ba926-557c-4bf1-a2ea-ceabbcf38824/cinqGFV

client/src/pages/Dashboard.tsx

@@ -218,7 +218,7 @@ export default function Dashboard() {
   };
 
   return (
-    <div className="flex-1">
+    <div className="flex-1 overflow-y-auto">
       <div className="p-6 space-y-6">
       {/* Header */}
       <div className="flex items-center justify-between">