fix: null guard on API array responses to prevent crash

web/src/api.ts

@@ -146,9 +146,12 @@ async function request<T>(method: string, path: string, body?: unknown): Promise
     return undefined as T;
   }
   const text = await res.text();
-  const data = text ? JSON.parse(text) : {};
+  if (!text) {
+    throw new ApiError(res.status, "empty response");
+  }
+  const data = JSON.parse(text);
   if (!res.ok) {
-    throw new ApiError(res.status, data.error || res.statusText);
+    throw new ApiError(res.status, (data && data.error) || res.statusText);
   }
   return data as T;
 }

web/src/components/FileBrowserModal.tsx

@@ -47,9 +47,9 @@ export default function FileBrowserModal({ initialPath, onSelect, onClose }: Pro
   useEffect(() => {
     api.fileCapabilities().then(setCapabilities).catch(() => {});
     api.fileRoots().then(r => {
-      setRoots(r.roots);
-      if (!initialPath && r.roots.length > 0) {
-        setCurrentPath(r.roots[0]);
+      setRoots(r.roots ?? []);
+      if (!initialPath && (r.roots ?? []).length > 0) {
+        setCurrentPath(r.roots![0]);
       }
     }).catch(() => {});
   }, []);
@@ -63,10 +63,11 @@ export default function FileBrowserModal({ initialPath, onSelect, onClose }: Pro
     setError(null);
     try {
       const res = await api.listFiles(path, pageNum, LIMIT);
+      const entries = res.entries ?? [];
       if (pageNum === 1) {
-        setEntries(res.entries);
+        setEntries(entries);
       } else {
-        setEntries(prev => [...prev, ...res.entries]);
+        setEntries(prev => [...prev, ...entries]);
       }
       setPage(pageNum);
       setHasMore(res.has_more);
@@ -165,7 +166,7 @@ export default function FileBrowserModal({ initialPath, onSelect, onClose }: Pro
         )}
 
         <div className="flex items-center gap-2 flex-wrap">
-          {roots.length > 1 && (
+          {(roots ?? []).length > 1 && (
             <select
               className="input w-auto"
               value={roots.includes(currentPath) ? currentPath : roots[0]}
@@ -270,7 +271,7 @@ export default function FileBrowserModal({ initialPath, onSelect, onClose }: Pro
                   </td>
                 </tr>
               ))}
-              {entries.length === 0 && !loading && (
+              {(entries ?? []).length === 0 && !loading && (
                 <tr>
                   <td colSpan={4} className="px-3 py-6 text-center text-slate-500">
                     Directorio vacío
@@ -290,7 +291,7 @@ export default function FileBrowserModal({ initialPath, onSelect, onClose }: Pro
 
         {hasMore && (
           <button className="btn-ghost w-full text-xs" onClick={() => loadDir(currentPath, page + 1)}>
-            Cargar más ({total - entries.length} restantes)
+            Cargar más ({total - (entries ?? []).length} restantes)
           </button>
         )}
 

web/src/pages/Files.tsx

@@ -65,10 +65,10 @@ export default function Files() {
   useEffect(() => {
     api.fileCapabilities().then(setCapabilities).catch(() => {});
     api.fileRoots().then(r => {
-      setRoots(r.roots);
+      setRoots(r.roots ?? []);
       setUnrestricted(r.unrestricted);
-      if (r.roots.length > 0) {
-        setCurrentPath(r.roots[0]);
+      if ((r.roots ?? []).length > 0) {
+        setCurrentPath(r.roots![0]);
       } else if (!r.unrestricted) {
         setCurrentPath("/");
       }
@@ -88,10 +88,11 @@ export default function Files() {
     setSearchQuery("");
     try {
       const res = await api.listFiles(path, pageNum, LIMIT);
+      const entries = res.entries ?? [];
       if (pageNum === 1) {
-        setEntries(res.entries);
+        setEntries(entries);
       } else {
-        setEntries(prev => [...prev, ...res.entries]);
+        setEntries(prev => [...prev, ...entries]);
       }
       setPage(pageNum);
       setHasMore(res.has_more);
@@ -237,7 +238,7 @@ export default function Files() {
     setSearching(true);
     try {
       const res = await api.searchFiles(currentPath, q, 100);
-      setSearchResults(res.results);
+      setSearchResults(res.results ?? []);
     } catch (e) {
       setError(e instanceof Error ? e.message : "Error searching");
     } finally {
@@ -285,7 +286,7 @@ export default function Files() {
       )}
 
       <div className="flex items-center gap-3 flex-wrap">
-        {roots.length > 1 && (
+        {(roots ?? []).length > 1 && (
           <select
             className="input w-auto"
             value={roots.includes(currentPath) ? currentPath : roots[0]}
@@ -328,9 +329,9 @@ export default function Files() {
         </button>
       </form>
 
-      {searchResults.length > 0 && (
-        <div className="card">
-          <div className="text-sm text-slate-400 mb-2">Resultados ({searchResults.length})</div>
+        {(searchResults ?? []).length > 0 && (
+          <div className="card">
+            <div className="text-sm text-slate-400 mb-2">Resultados ({(searchResults ?? []).length})</div>
           <div className="max-h-48 overflow-y-auto">
             {searchResults.map((hit, i) => (
               <div
@@ -476,7 +477,7 @@ export default function Files() {
                 </td>
               </tr>
             ))}
-            {entries.length === 0 && !loading && (
+            {(entries ?? []).length === 0 && !loading && (
               <tr>
                 <td colSpan={5} className="px-4 py-8 text-center text-slate-500">
                   {searchQuery ? "Sin resultados" : "Directorio vacío"}
@@ -496,7 +497,7 @@ export default function Files() {
 
       {hasMore && (
         <button className="btn-ghost w-full text-xs" onClick={() => loadDir(currentPath, page + 1)}>
-          Cargar más ({total - entries.length} restantes)
+          Cargar más ({total - (entries ?? []).length} restantes)
         </button>
       )}