fix(ts): resolve TypeScript errors from CI

- dashboard/page.tsx: add missing connectionError state (contributor forgot useState)
- ContributorsPanel.tsx: replace Github with GitBranch (not exported in lucide-react@1.8)
- OpenSourceBadge.tsx: replace Github with GitBranch (same reason)

frontend/src/app/dashboard/page.tsx

@@ -32,6 +32,7 @@ export default function DashboardPage() {
   const [sidebarOpen, setSidebarOpen] = useState(true);
   const [viewerOpen, setViewerOpen] = useState(true);
   const [hallOfFameOpen, setHallOfFameOpen] = useState(false);
+  const [connectionError, setConnectionError] = useState("");
 
   // Auth guard
   useEffect(() => {

frontend/src/components/layout/ContributorsPanel.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { useState, useEffect } from "react";
-import { Github, Star, GitPullRequest, Users, X, Trophy, ExternalLink } from "lucide-react";
+import { GitBranch, Star, GitPullRequest, Users, X, Trophy, ExternalLink } from "lucide-react";
 import { Button } from "@/components/ui/button";
 
 interface Contributor {
@@ -166,7 +166,7 @@ export default function ContributorsPanel({ onClose }: { onClose: () => void })
             rel="noopener noreferrer"
           >
             <Button variant="outline" size="sm" className="h-7 text-xs gap-1.5">
-              <Github className="w-3.5 h-3.5" />
+              <GitBranch className="w-3.5 h-3.5" />
               View on GitHub
               <ExternalLink className="w-3 h-3" />
             </Button>

frontend/src/components/layout/OpenSourceBadge.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { useState, useEffect } from "react";
-import { Github, Star, GitFork, Heart, Trophy } from "lucide-react";
+import { GitBranch, Star, GitFork, Heart, Trophy } from "lucide-react";
 
 interface Props {
   onOpenHallOfFame: () => void;
@@ -32,7 +32,7 @@ export default function OpenSourceBadge({ onOpenHallOfFame }: Props) {
           {/* Top section */}
           <div className="px-4 pt-4 pb-3 border-b border-border/40">
             <div className="flex items-center gap-2 mb-1">
-              <Github className="w-4 h-4" />
+              <GitBranch className="w-4 h-4" />
               <span className="text-sm font-semibold">Open Source</span>
               <span className="ml-auto text-[10px] px-1.5 py-0.5 rounded-full bg-green-500/15 text-green-400 font-medium border border-green-500/20">
                 GSSOC
@@ -99,7 +99,7 @@ export default function OpenSourceBadge({ onOpenHallOfFame }: Props) {
         `}
         title="Open Source — Support this project"
       >
-        <Github className="w-4 h-4 group-hover:text-primary transition-colors" />
+        <GitBranch className="w-4 h-4 group-hover:text-primary transition-colors" />
         <span className="text-xs font-medium hidden sm:inline">Open Source</span>
         {stars !== null && (
           <span className="flex items-center gap-0.5 text-[11px] font-semibold text-yellow-500">