fix: defensive parsing and dynamic branch in GitHub URLs

- RepoSummaryCard: defensive namingConventions sort (handle NaN, empty array)
- ResultCard: language badge uses same fallback as SyntaxHighlighter
- ResultCard: use defaultBranch prop instead of hardcoded 'main'
- SearchPanel: pass defaultBranch to ResultCard
- DashboardHome: pass repo.branch to SearchPanel

Author: DevanshuNEU

frontend/src/components/RepoSummaryCard.tsx

@@ -117,10 +117,16 @@ function generateSummary(repo: Repository, insights: any, style: any) {
   const asyncAdoption = style?.summary?.async_adoption || null
   const typeHints = style?.summary?.type_hints_usage || null
 
-  // Get naming convention
+  // Get naming convention - defensive parsing
   const namingConventions = style?.naming_conventions?.functions || {}
-  const primaryNaming = Object.entries(namingConventions)
-    .sort((a: any, b: any) => parseFloat(b[1].percentage) - parseFloat(a[1].percentage))[0]
+  const namingEntries = Object.entries(namingConventions)
+  const primaryNaming = namingEntries.length > 0
+    ? namingEntries.sort((a: any, b: any) => {
+        const pctA = parseFloat(a[1]?.percentage ?? '0') || 0
+        const pctB = parseFloat(b[1]?.percentage ?? '0') || 0
+        return pctB - pctA
+      })[0]
+    : null
   const namingStyle = primaryNaming ? primaryNaming[0] : null
 
   // Get critical files

frontend/src/components/SearchPanel.tsx

@@ -9,9 +9,10 @@ interface SearchPanelProps {
   apiUrl: string;
   apiKey: string;
   repoUrl?: string;
+  defaultBranch?: string;
 }
 
-export function SearchPanel({ repoId, apiUrl, apiKey, repoUrl }: SearchPanelProps) {
+export function SearchPanel({ repoId, apiUrl, apiKey, repoUrl, defaultBranch }: SearchPanelProps) {
   const [query, setQuery] = useState('');
   const [results, setResults] = useState<SearchResult[]>([]);
   const [loading, setLoading] = useState(false);
@@ -79,6 +80,7 @@ export function SearchPanel({ repoId, apiUrl, apiKey, repoUrl }: SearchPanelProp
             isExpanded={idx === 0}
             aiSummary={idx === 0 ? aiSummary || undefined : undefined}
             repoUrl={repoUrl}
+            defaultBranch={defaultBranch}
           />
         ))}
       </div>

frontend/src/components/dashboard/DashboardHome.tsx

@@ -229,6 +229,7 @@ export function DashboardHome() {
                   apiUrl={API_URL} 
                   apiKey={session?.access_token || ''}
                   repoUrl={selectedRepoData?.git_url?.replace('.git', '')}
+                  defaultBranch={selectedRepoData?.branch}
                 />
               )}
               {activeTab === 'dependencies' && (

frontend/src/components/search/ResultCard.tsx

@@ -13,9 +13,10 @@ interface ResultCardProps {
   isExpanded?: boolean;
   aiSummary?: string;
   repoUrl?: string;
+  defaultBranch?: string;
 }
 
-export function ResultCard({ result, rank, isExpanded: initialExpanded = false, aiSummary, repoUrl }: ResultCardProps) {
+export function ResultCard({ result, rank, isExpanded: initialExpanded = false, aiSummary, repoUrl, defaultBranch = 'main' }: ResultCardProps) {
   const [expanded, setExpanded] = useState(initialExpanded);
   const contentRef = useRef<HTMLDivElement>(null);
   const [contentHeight, setContentHeight] = useState<number | undefined>(initialExpanded ? undefined : 0);
@@ -26,7 +27,7 @@ export function ResultCard({ result, rank, isExpanded: initialExpanded = false,
 
   const cleanFilePath = result.file_path.replace(/^repos\/[a-f0-9-]+\//, '');
   const displayPath = cleanFilePath.split('/').slice(-3).join('/');
-  const githubUrl = repoUrl ? `${repoUrl}/blob/main/${cleanFilePath}#L${result.line_start}-L${result.line_end}` : null;
+  const githubUrl = repoUrl ? `${repoUrl}/blob/${defaultBranch}/${cleanFilePath}#L${result.line_start}-L${result.line_end}` : null;
 
   useEffect(() => {
     if (expanded) {
@@ -98,7 +99,7 @@ export function ResultCard({ result, rank, isExpanded: initialExpanded = false,
             >
               {result.code}
             </SyntaxHighlighter>
-            <span className="absolute top-3 right-3 px-2 py-0.5 text-[10px] font-mono uppercase bg-muted text-muted-foreground rounded">{result.language}</span>
+            <span className="absolute top-3 right-3 px-2 py-0.5 text-[10px] font-mono uppercase bg-muted text-muted-foreground rounded">{result.language || 'text'}</span>
           </div>
 
           <div className="px-4 py-3 bg-muted/50 flex items-center justify-between">